Q: ADA2200 SPICE MODEL errors during the extraction

Original Question: ADA2200 SPICE MODEL by preet_singh Hello all, Spice model of ADA2200 is showing following errors during extraction: "ERROR: .subckt ADA2200 INP INN VOCM CLKIN GND RCLK SYNCO OUTN OUTP VDD ERROR: .subckt IIR VDD IN OUT nCLK1 dCLK1 COM ERROR: .subckt SHAPAD IN OUTP VDD CLKIN COM OUTN VOCM". and I am using OrCAD_16.6_Lite software. What should I do ? Regards, Sukhjinder Singh 2630.Capture.JPG Verified Answer: RE: ADA2200 SPICE MODEL by krisf Hi Sukhjinder, I have moved some of the .ends statements around and I was able to import the model. Could you try the attached model out if it works? Thanks, Kris ada2200.cir.zip Suggested Answer: RE: ADA2200 SPICE MODEL by krisf Hi Sukhjinder, I have moved some of the .ends statements around and I was able to import the model. Could you try the attached model out if it works? Thanks, Kris 2477.ada2200.cir.zip Question: RE: ADA2200 SPICE MODEL by preet_singh Thank you very much Kris. Now it works with zero errors. Question: RE: ADA2200 SPICE MODEL by totolapp Hello, I also have problems with the spice model on ORCAD 16.6. My error is that can not find the HC74D model. can you help me ? Regards Jean

Q: AD8561 Reliability data

Original Question: AD8561 by das-48 Need Reliability data for AD8561 or good estimate Verified Answer: RE: AD8561 by EZAdministrator This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum. Thank you, EZ Admin Question: RE: AD8561 by das-48 Thanks! Question: RE: AD8561 by FormerMember Check out: Reliability Data | Analog Devices Click on wafer fab data and put the part number in. Harry

Q: Part Status

Original Question: Part Status by bharti hello, Good day to you. can you please let you know the part status whether the part is "Active/Discontinued " for the below requested part numbers. part number LT1129IQ-5 HMC529LP5TR LTC6908HS6-2#TR LTC6907CS6#TR These parts are listed on web with PBF suffix. Kindly confirm whether the Parts without pbf suffix are Active or not. Also provide the general confirmation on NON ROHS part .If the parts are not listed under Sample & Buy can we consider as Discontinue or those parts are still Active Thanks & Regards Bharti Saini Verified Answer: RE: Part Status by ADIApproved Hi Bharti, The latest product ordering guide information and availability is published on the product page for each product. Please refer to the product page for any product which you require information. If a part is not listed on the product page ordering guide you should consider it as not available. Regards, Rob Reply: RE: Part Status by Gauzz Hi Bharti, PBF suffix means that the part has a lead free finish. TRPBF means that the part is lead free finish and is sold in tape and reel. If you are buying a non-standard or special product that is not on the list, please contact your sales representative. Regards, Goz

Q: On the Wafer layout of AD630SD/883B products

Original Question: On the Wafer layout of AD630SD/883B products by lerry Dear all I want to ask a question about the layout of Datasheet. The wafer layout published by Datasheet (shown in the figure) is this for reference only? Verified Answer: RE: On the Wafer layout of AD630SD/883B products by Fdelaram Hi, I think this is a duplicate thread of this https://ez.analog.com/amplifiers/f/q-a/166451/on-the-wafer-layout-of-ad630sd-883b-products . Let us wait for George's advise. Thanks and regards. Reply: RE: On the Wafer layout of AD630SD/883B products by lerry Dear all. Ask the ADI online technical engineer to answer my questions. BR~ Reply: RE: On the Wafer layout of AD630SD/883B products by lerry Dear all Is there any ADI technical engineer who can answer my question? Wait online. Thank you! Reply: RE: On the Wafer layout of AD630SD/883B products by lerry Dear all Which ADI technical engineer please reply to my question, thank you very much! Thanks and regards. Reply: RE: On the Wafer layout of AD630SD/883B products by lerry ez.analog.com/.../0564.AD630SD883B-QA-issue.pdf The attachment is the ADI agent's reply to my content. I would like to ask the ADI technical engineer whether it is reasonable to reply me like this.

Question 1

Low Output of AD8436

Accepted Answer

Original Question: Output of AD8436 by intec 
 Hi everyone, 
 we are designing a true rms circuit using the AD8436 (see attached pdf). 
 The Circuits uses a wide input range of AD8436 to measure input voltages from 0-250V RMS with different input frequencies An external opmamp circuit adjusts the values to the one specified in AD8436's datasheet. The Circuits works but it does not deliver the right values. 
 The output of the TRMS device always delivers a much to low value. When I remove the 3.3uF capacitor of the low pass filter I can see that the peak value of signal corresponds to the expected RMS value. But as soon as I activate the filter again the value drops to much. The datasheet states 0.5% error but I reach 2%-3.6% depending on the input voltage. The higher the input voltage is the higher the error. 
 We've already checked the whole circuit and tried to use the sallen key- filter but the result stays the same. I also tried to exchange capacity values without success. Simulating the circuit using the pspice model does not show the effect. 
 But when I look through the datasheet I recognized the sentence: "Fully specified for 300mV RMS input". Does that mean that every picture is only valid for that option ...? What if the input (as in our case) rises upt to 1.77V RMS? In other datasheets like the AD636 or the RMS- to DC- Application guide I can find a diagram showing the error in correlation of the input voltage. Does the AD8436 not have a correlation like this? When I refer to the effects I've seen in our circuit I would say yes but I can't find any information on this. 
 Could anyone explain these effects? 
 What is wrong in our circuit or what do I have to take in to account to get a reseult with higher accuray? 
 Any help or suggest is very welcomed 
 Regards Christian

3858.AC_Meas.pdf 
 
 Verified Answer: RE: Output of AD8436 by intec 
 Hi everyone, 
 in the meantime we could solve the problem. 
 There were two effects explaining that issue: 
 1. the input signal which had a low amplitude HF- signal overlayed which comes out of the signal source. Up to 
 know we're not sure where it comes from but anyhow it is there, 
 2. The bandwidth of AD8436. Bacuase of the bandwidth of AD8436 ist was impoosible for the device to evaluate 
 the HF- ripple as well. But the prroblem was that we wher comparing that value to a device which can do this 
 so there was a big gap in measurement values. 
 Solution: 
 We added additional 100pF Capacitors in parallel to the input amplifier which is located before the input of AD8436 to filter out HF ripple of the signal. After modification values are comparable to another device not evaluating the HF- ripple as will. 
 Question: RE: Output of AD8436 by ADIApproved 
 Hi, 
 I responded to this on 9/11, using the email address at the bottom, signed Christian. I received what I think was an 'out of office' message, but I don't read German very well. First, I'll copy my original response: 
 Hi Christian, 
 I&rsquo;m using you email contact information because my EZ path seems to have a ton of delay and messaging is very frustrating. You can go ahead and attach this to the blog if you wish. 
 I&rsquo;m the apps engineer for the AD8436. I printed out your schematic, BTW thanks for including it. It really saves a lot of time and avoids headaches deciphering text and I wish everybody did the same. The AD8436 is trimmed and tested in production at 300mV, however your error numbers do sound excessive. I have some suggestions you could check out that might help. I too have see funny errors with rms-dc converters, however I have always found a solution so I&rsquo; able to pass a few on to fellow travelers 
 First I need to get the input conditions straight in my mind. You noted an input voltage up to 250Vrms, I assume this is sine wave? This would be 707V pk-pk, or 353V (rounding) pk. You attenuate .00145x or about 69:1 with the 510k/15k differential attenuator, dropping the input to 5.12V pk per side, or 10.24V pk-pk. Have I got this right so far? 
 Without taking onto account source loading (the 100k resistors are driven by slightly less than 7.5k each side), your diff-amp circuit U600A provides a gain of 5. So for a 250V rms signal you end up with 50V at the output of the diffamp, quite impossible with a 12V supply. Is there additional attenuation not included on the schematic? 
 So before we go further please straighten me out, somewhere I must have made an error to come up with such a ridiculous result. 
 Also, I haven&rsquo;t seen a .info extension, is this something new? 
 Best, 
 js 
 Now to respond to the latest:: 
 I'm happy to see that you've discovered a spurious input and I hope this turns out to be the real issue. It's very easy to fix, with the by-pass cap as you have done, so......... nice work! 
 I have a couple of other suggestions as well. I noticed you're using an 47uF/805/X5R style capacitor as an averaging capacitor. I haven't investigated X5R multilayer caps capacitors but the small footprint, low voltage and large value (47uF) raise some flags. 
 Size: Unless you're trying to convert frequencies < 2 Hz, you don't need such a large value. This size will just stretch out you settling time, for line frequency applicaitons (which I assume you have here) 4.7uF to 10uF is plenty to reduce the conversion to around 0.1%. You will find that external low-pass filtering is far more efficient, either passive with a 3.3uF at pin-OUT, or using the 2-pole SK option. I can suggest values for that approach as well. I suspect you might have chosen your cap values based on a prior ADI device, but in any event the internal ting achitecture is different in the AD8436 from prior parts. 
 You didn't spevcify whether your error was positive or negative. If positive, the error would be consistent with the spurious input condition you found, if negative, it might have another source, nemely, board contamination. This problem has become much worse with the use of lead-free RoHS compliant electronics, as the fluxes used are hard to remove and the cleansing materials have to be maintained. In our lab, I found that hand=washing is not always effective. We now have a proper small scale board assembly area with up-to-date board washing facilities and it makes all the difference. I now specify the use of this wonderful capability and have had no more coard contamination issues. 
 Getting back to the CAVG component topic, the sensitivity of this circuit has a lot to do with the capacitor drive circuit, which happens to be a current source. If there is any leakage path, either on the bopard or through tha capacitor the resistance (even several M-ohms) creates a shunt for the dc-current component. The current source provides a fixed current, so the shunt path creates a small output error, usually negative. 
 I've tried checking capacitors with electrometers and I think this works, but I also have a large selection of film caps, which I consider the gold-standard in capacitor quality factors. They also have very low dielectric absorption, which can cause a drift or repeatability issues. For a short while I used an 1000uF electrolytic as a low-pass filter to knock out ripple. This sort of works, and I thought at first the voltage source drive would mitigate capacitor errors but I learned about dielectric absorbtion the hard way! I now have 100uF worth of film caps for my lab measurements. Of course, this isn't needed for real applications. 
 One final word, Kemet has some high temperature parts designed for automotive applocations - the rated temperature is 150C and they come in large sizes. I've tried a coiple of these and they look pretty good. They are also non-microphonic (aka non-piezoelectric) which the X5R are not! The dielectric has been changed from the Barium compound previously used. 
 Sorry to be a couple of days late, and best of luck on your project. Is this for a commercial application, or is this a scholastic project? 
 Best, 
 js 
 Question: RE: Output of AD8436 by intec 
 Hi 
 thanks for your detailed answers. Now I know why you have received an out of office reply because at the moment I'm using the log in of a colleague who is on holiday. 
 I'm very sorry if this was a little confusing for you and delayed my response. 
 Now again th the facts and to the questions and Ideas you have mentioned above: 
 
 I nput range: Yes you're right we have an input range of 0 -250 VRMS divided into to input stages (0-50V RMS) and (51- 250VRMS). An input voltage divider breaks down voltage to max. 5V peak- peak voltage wich is amplified by an opamp after that. Depending on the input volatge we switch gain from 4.99 to 1.01 so that output range of the OP will not reach unallowd values. Mainly we're talking about an sine- input signal which was used for testing in that case. 
 Behaviour of the output signal of AD8436: Output of AD8436 was always to low. For better understanding I have attached a pdf showoing the issue. In comparsion to a calibrated multimeter the noise on the signals was not evalutated for TRMS- measuring by AD8436 so the value was to low. But after adding the input filter at input OP now the output signal of AD8436 is somewhere in the middle of the value of the calibrated TRMS- meter and the former value of AD8436 without input filter. Now this value is comparable to another TRMS meter which does not evalute noise as well. The difference to the calibrated devices now is minimized but still there. If you have an idea to increase accuray more in direction to the values of the calibrated TRMS- meter please let us know. 
 CAVG-/CLPF- Caps: We also tried out several Capacitor combinations. First of all we thought of using a 47uF cap to have the ability of measuring values <30 Hz as well but after checking the values we could not find any difference between unsing a 10uF and a 47uF Cap so we finally decided to use the recommended 10uF. We also tried to use different comibinations and values but there was no difference using a film or ceramic capacitor. Without input filtering values stayed to low. Because of the fact that we're designing a hand held device in as small housing huge sizes for component are a no go that means we have to stick to ceramic capacitors anyhow. When I remove CLPF of 3.3uF I could see that ther wa a high output ripple in range of 20mV -80mV as a function of the amplitude of the input signal ripple frequency was twice the input signal frequency. The peak value then was the expected TRMS- Value the calibrated TRMS- meter delivered. In my eyes that must be the noise of the input signal wich is not evaluated and averaged when adding CLPF. Or do you have another explanaition for that issue? 
 Project type: We're desiging for a commercial product. 
 
 I hope above information will help to understand our issue. Any idea or advice for improvment is very welcomed. 
 Best Regards 
 Christian 
 Question: RE: Output of AD8436 by ADIApproved 
 Goof morning Christian, 
 Our field applications engineer, Bernd Kraetzig, will contact you shortly. If acceptable to you, and at your convenience, I&rsquo;d like to discuss this with you on the phone. 
 Thanks very much, 
 James

Question 2

ADA2200 SPICE MODEL  errors during the extraction

Accepted Answer

Original Question: ADA2200 SPICE MODEL by preet_singh 
 Hello all, 
 Spice model of ADA2200 is showing following errors during extraction: 
 "ERROR: .subckt ADA2200 INP INN VOCM CLKIN GND RCLK SYNCO OUTN OUTP VDD 
 ERROR: .subckt IIR VDD IN OUT nCLK1 dCLK1 COM 
 ERROR: .subckt SHAPAD IN OUTP VDD CLKIN COM OUTN VOCM". 
 and I am using OrCAD_16.6_Lite software. What should I do ? 
 Regards, 
 Sukhjinder Singh

2630.Capture.JPG 
 
 Verified Answer: RE: ADA2200 SPICE MODEL by krisf 
 Hi Sukhjinder, 
 I have moved some of the .ends statements around and I was able to import the model. Could you try the attached model out if it works? 
 Thanks, 
 Kris

ada2200.cir.zip 
 
 Suggested Answer: RE: ADA2200 SPICE MODEL by krisf 
 Hi Sukhjinder, 
 I have moved some of the .ends statements around and I was able to import the model. Could you try the attached model out if it works? 
 Thanks, 
 Kris

2477.ada2200.cir.zip 
 
 Question: RE: ADA2200 SPICE MODEL by preet_singh 
 Thank you very much Kris. Now it works with zero errors. 
 Question: RE: ADA2200 SPICE MODEL by totolapp 
 Hello, 
 I also have problems with the spice model on ORCAD 16.6. My error is that can not find the HC74D model. can you help me ? 
 Regards 
 Jean

Question 3

100mh transimpedance amplifier design

Accepted Answer

Original Question: transimpedance amplifier design by moki 
 Hello 
 I am working on a project about a wavemeter. the wavemeter have 16 photodiodes. I want to design a transimpedance amplifer that I will interface with an ADC that I will later select. 
 - My problem is selecting a transimpedance amplifier with a speed of 100MHz at 10ns with low noise. this is because the photodiode are working in the photovoltaic mode which is a problem at high frequencies. With a high signal to noise ratio. My question are: its possible to have transimpedance amplifier that can perform this task. Do I need a two stages. design one for the transimpedance amplifier and the other for the additional gain . 
 the photodiode current is 0.04mA and capacitance is 100pF 
 - the ADC will be 12 bits with a sample rate of 100MHz 
 Verified Answer: RE: transimpedance amplifier design by EZAdministrator This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum. Thank you, EZ Admin Question: RE: transimpedance amplifier design by Matt.Duff 
 I think trying to get 12 bit performance out of a 100pF photodiode at 100 MHz is going to be a losing proposition. This combination sets up a pretty big noise gain, no matter what op amp you pick for the TIA or how many stages you use. 
 Your performance will get a big boost if you can decrease that photodiode capacitance. What is preventing you from using the photodiode in photoconductive mode? Or can you use a different photodiode with less capacitance? 
 You mentioned you were looking at ADCs that sample at 100 MHz. This means that if you actually have 100 MHz bandwidth from the TIA, you will alias a good bit of the noise. If you can use a lower TIA bandwidth (but still sample at 100 MHz), your noise performance will be a lot better. Of course this will hit your rise time, so perhaps this is a no go. 
 You can play around with various combinations with this tool: www.analog.com/photodiodewizard . To see a one stage design, I'd recommend starting with a peak voltage (in the circuit design screen) of 20mV. If using a 2 stage design, setting the peak voltage to 500 mV or less works well. You can also play around with the photodiode capacitance to see how things get a lot easier if you can reduce it. 
 Question: RE: transimpedance amplifier design by moki 
 Hello Matt.Duff, 
 Thank for the reply, I will used the tool to look at the different soulutions.

Question 4

AD8561 Reliability data

Accepted Answer

Original Question: AD8561 by das-48 
 Need Reliability data for AD8561 or good estimate 
 Verified Answer: RE: AD8561 by EZAdministrator This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum. Thank you, EZ Admin Question: RE: AD8561 by das-48 
 Thanks! 
 Question: RE: AD8561 by FormerMember 
 Check out: Reliability Data | Analog Devices 
 Click on wafer fab data and put the part number in. 
 Harry

Question 5

ad835 for making BPSK modulator

Accepted Answer

Original Question: ad835 by mira_21 
 Hi, 
 i am using AD835 for making BPSK modulator. I am using schematic amplitude modulator , whether it can produce BPSK signals ? My input signal is digital. because I tried it , did not produce a BPSK signal . is there any suggestions? 
 Regards, 
 mira_21 
 Verified Answer: RE: ad835 by EZAdministrator This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum. Thank you, EZ Admin Question: RE: ad835 by ADIApproved 
 Hi mira_21, 
 I'm afraid you can't use the amplitude modulator circuit to produce Binary Phase Shift Keying signal. In amplitude modulation, the carrier's amplitude is being modulated. This means that the amplitude of the carrier varies while its phase and frequency are constant. In BPSK, the phase of the carrier is digitally modulated, while the amplitude and frequency are constant. If you want to implement angle modulation like BPSK, I think the Direct Digital Synthesis (DDS) community has some products that might help you for your application. 
 I hope this helps! 
 Best Regards, 
 Neil 
 Suggested Answer: RE: ad835 by ADIApproved 
 Hi, 
 I am a little confused on your problem. Are you using the AD835 Amplitude Modulator circuit as described on Figure 23 of AD835 datasheet? If you are using that to generate BPSK signals, then that circuit won't give you your desired output signals. 
 On the paper you attached, AD835 is used in a BPSK circuit as a multiplier. However, using the AD835 alone won't give you BPSK. As shown in Figure 2 of the paper, in order to implement BPSK, you will need other blocks such as the Shaping and Level Translator, which are not done by the AD835. 
 I have talked to DDS engineers and that they confirmed that they have parts that are capable of doing BPSK. If your concern is to produce BPSK signals regardless of what parts to use, I suggest you give it a try on the DDS community. 
 Best regards, 
 Neil 
 Question: RE: ad835 by mira_21 
 Tq Mr. Neil. 
 I've read that there was someone who has made a BPSK modulator using this AD835. I attach this paper. how about this? 
 please help me. 
 Question: RE: ad835 by mira_21 
 thank you for you suggestion Mr. Neil. 
 it's very helpful. 
 BR, 
 mira_21 
 Question: RE: ad835 by ADIApproved 
 Hi mira_21, 
 I have read your post on the DDS community and noticed that it was moved back to the Amplifiers Community since you are asking about the AD835 again. Does this mean that you want a BPSK circuit with the AD835 and not a BPSK which could be a single chip solution? I would also appreciate if you could share the actual schematic of your BPSK that you said you have already built. I am not sure which circuit you are referring to when you said your circuit did not work. 
 Best Regards, 
 Neil 
 Question: RE: ad835 by mira_21 
 Hi. 
 i have synchronized carrier with NRZ input. But, why the phase not shift from 0 to 180? i have added block Shaping, NRZ synchronize, and level translator.

Question 6

AD835 as a Multiplier

Accepted Answer

Original Question: AD835 by mira_21 
 hi engineer, 
 i want to function ad835 as a multiplier. i want to make this component to produce BPSK Signal. i had a discussion with Mr. Neil and he suggested to visit this forum. i have applied the example of design BPSK that used AD835. i have tried it but it didn't work. please help me how to use AD835 to produce BPSK signal. thank you. 
 Best Regards, 
 mira_21

example_designBPSK.pdf 
 
 Verified Answer: RE: AD835 by EZAdministrator This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum. Thank you, EZ Admin Question: RE: AD835 by ADIApproved 
 Hi- 
 I have moved this question about the AD835 to the Amplifiers community. Someone here should be able to assist you. 
 Regards, 
 AndyR 
 EngineerZone Support Community Manager 
 Question: RE: AD835 by ADIApproved 
 Hi mira_21, 
 I replied to your other post. I thought that the DDS community might be able to help you since they have single chip solution that is capable of producing BPSK signals. But apparently, you wanted to go with a discrete BPSK circuit that makes use of the AD835 multiplier IC. Is this correct? Please take a look at my reply to the other thread. 
 Thank you, 
 Neil 
 Question: RE: AD835 by mira_21 
 Hi Mr.Neil, 
 thank you so much for your attention about my problem. yeah, i wanna make BPSK modulator using AD835 cause i have bought it. here i attach a file about my BPSK circuit. sorry if this circuit looked bad, cause i'm newbie. 
 After you look at my circuit, please tell me what is wrong with my circuit cause the output was not producing BPSK signal. 
 Thank you, 
 Mira_21 
 Question: RE: AD835 by ADIApproved 
 Hi Mira_21, 
 Thank you for clarifying that. I looked at your actual circuit and I noticed that R3 is connected differently as compared to the circuit in the paper you were referring. Have you checked on this? 
 
 Also, I am curious on the signals at the X1 and Y1 pins. Could you take some scope shots on these input pins? I want to make sure that we are having the correct input levels for the AD835. If possible, please include the output bpsk signal on the scope shot. 
 Regards, 
 Neil 
 Question: RE: AD835 by ADIApproved 
 Hi, 
 There was no scope shots for the inputs on the document the you attached. Could you re-send the scope shots of the two inputs on the same picture? 
 On the paper you sent earlier, the oscillator output is connected to the X1 pin via a resistor divider. However, the one you built had a different resistor configuration. I am not sure though if this could affect your circuit as long as the input pins of the AD835 are within the specified voltage range. 
 Thanks. 
 additional discussion added to reply. Message was edited by: Neil Kane Jacalan 
 Question: RE: AD835 by mira_21 
 Hi Mr.Neil. 
 Tq for your respon. 
 i attached the input and output of my circuit. 
 please tell me what was wrong with my circuit. 
 about R3 that i have made, i thought it similiar to the circuit of the paper that i have sent to you. 
 thank you. 
 mira_21 
 Question: RE: AD835 by mira_21 
 mr. neil, this is my scope shot of INPUT X1 and Y1. thank you.. 
 Suggested Answer: RE: AD835 by ADIApproved 
 Hi, 
 Thank you for the scope shots. Your inputs seem to be good. However, are the digital signal and carrier signal synchronized? In order to properly implement BPSK, the carrier frequency must be an exact multiple of the digital bit clock such that they cross the zero level at the same time. I can't tell whether your carrier and digital clock are synchronized based on your AD835 schematic and input scope shots. The reason why I asked for the inputs to be on the same scope shot (or the same picture) is to see whether they cross the zero level at the same time. 
 Best regards, 
 Neil

Question 7

Part Status

Accepted Answer

Original Question: Part Status by bharti 
 hello, 
 
 Good day to you. 
 
 can you please let you know the part status whether the part is "Active/Discontinued " for the below requested part numbers. 
 
 part number 
 LT1129IQ-5 
 HMC529LP5TR 
 LTC6908HS6-2#TR 
 LTC6907CS6#TR 
 
 These parts are listed on web with PBF suffix. Kindly confirm whether the Parts without pbf suffix are Active or not. Also provide the general confirmation on NON ROHS part .If the parts are not listed under Sample & Buy can we consider as Discontinue or those parts are still Active 
 
 Thanks & Regards 
 Bharti Saini

Verified Answer: RE: Part Status by ADIApproved 
 Hi Bharti,

The latest product ordering guide information and availability is published on the product page for each product. Please refer to the product page for any product which you require information. If a part is not listed on the product page ordering guide you should consider it as not available. 
 
 Regards, 
 Rob 
 
 Reply: RE: Part Status by Gauzz 
 Hi Bharti, PBF suffix means that the part has a lead free finish. TRPBF means that the part is lead free finish and is sold in tape and reel. 
 If you are buying a non-standard or special product that is not on the list, please contact your sales representative. 
 Regards, Goz

Question 8

Part Status - Part 2

Accepted Answer

Original Question: Part Status by bharti 
 Hello, 
 
 Good day to you, 
 
 Could you please tell us the Current part status whether the part is &ldquo;Active/Discontinued&rdquo; for the below requested part number. since we are unable to locate at your website. 
 
 Part number 
 AD7276BUJZ 
 LT1004IS8-1.2 
 LT1013IS8 
 LT1121AHVIS8 
 LT1175IS8 
 LT1175IS8-5 
 LT1762EMS8 
 LT1763CS8-5 
 LT1962EMS8 
 LTC1046IS8 
 LTC1153IS8 
 LTC2924IGN 
 LTC3406ES5-1.5#TRM 
 LTC4252A-1IMS 
 LTC4440EMS8E 
 LTC2864IDD-2#TRMPBF 
 LT1175IQ-5 
 LT1461CIS8-3

Thank you in advance for your time. 
 Regards 
 Bharti Saini 
 Verified Answer: RE: Part Status by ADIApproved 
 Hi Bharti,

The latest product ordering guide information and availability is published on the product page for each product. Please refer to the product page for any product which you require information. If a part is not listed on the product page ordering guide you should consider it as not available. 
 
 Regards, 
 Rob 
 Question: RE: Part Status by ACaldejon 
 LT1121AHVIS8, LT1175IS8, LT1175IS8-5, LT1762EMS8, LT1763CS8-5, LT1962EMS8 
 After checking our site, the following part numbers are active. 
 *part numbers on the website with suffix "#PBF" are only with lead free finished while the partnumbers without "#PBF" have a lead based finished. 
 *part numbers with suffix "#TRPBF" only differs in packing quantity. 
 
 example: for part number LT1121AHVIS8. 
 Go to the link below (Sample&buy page) to access the availability of the product. 
 https://www.analog.com/en/products/lt1121.html#product-samplebuy 
 You can choose between LT1121AHVIS8#PBF and LT1121AHVIS8#TRPBF. 
 Same thing goes with other partnumbers. 
 Thanks. 
 
 Suggested Answer: RE: Part Status by ADIApproved 
 LT1013IS8 is only available with lead free finish, so the "#PBF" is required. 
 There are 2 valid ordering numbers: 
 LT1013IS8#PBF, and LT1013IS8#TRPBF which designates tape and reel. 
 Question: RE: Part Status by bharti 
 Hello Team, 
 Could you please tell us the Current part status whether the part is &ldquo;Active/Discontinued&rdquo; for the below requested part number. since we are unable to locate at your website. 
 part number 
 LTC2864IDD-2#TRMPBF 
 
 we have one more concern if the part is not listed on Mfr website so we can consider the part is obsolete. 
 
 kindly Advise 
 
 Regards 
 Bharti saini

Question 9

On the Wafer layout of AD630SD/883B products

Accepted Answer

Original Question: On the Wafer layout of AD630SD/883B products by lerry 
 Dear all 
 I want to ask a question about the layout of Datasheet. 
 The wafer layout published by Datasheet (shown in the figure) is this for reference only?

Verified Answer: RE: On the Wafer layout of AD630SD/883B products by Fdelaram 
 Hi, 
 I think this is a duplicate thread of this https://ez.analog.com/amplifiers/f/q-a/166451/on-the-wafer-layout-of-ad630sd-883b-products . 
 Let us wait for George's advise. 
 Thanks and regards. 
 
 Reply: RE: On the Wafer layout of AD630SD/883B products by lerry 
 Dear all. 
 Ask the ADI online technical engineer to answer my questions. 
 BR~ 
 
 Reply: RE: On the Wafer layout of AD630SD/883B products by lerry 
 Dear all 
 Is there any ADI technical engineer who can answer my question? 
 Wait online. Thank you! 
 
 Reply: RE: On the Wafer layout of AD630SD/883B products by lerry 
 Dear all 
 Which ADI technical engineer please reply to my question, thank you very much! 
 Thanks and regards. 
 
 Reply: RE: On the Wafer layout of AD630SD/883B products by lerry 
 ez.analog.com/.../0564.AD630SD883B-QA-issue.pdf 
 The attachment is the ADI agent's reply to my content. I would like to ask the ADI technical engineer whether it is reasonable to reply me like this.

Question 10

On the Wafer layout of AD630SD/883B products -  Original Question

Accepted Answer

Original Question: On the Wafer layout of AD630SD/883B products by lerry 
 Dear Support 
 Why is the layout of the PN:AD630SD/883B DC:2019+ wafer different from that of the datastheet when we order it? 
 This is the layout on the datasheet in the specification. 
 
 This is AD630SD/883 DC:2019+ by de-encapsulating the components, and the wafer layout can be seen visually as shown in the figure: (for example, a microscope with a magnification of 200X) de-encapsulate the assembly 
 
 As shown in the picture, the red mark is different from datasheet. 
 I would like to ask, why is the layout of the wafer different from that of the datasheet? 
 Does ADI have any information on this? 
 Can you provide me with the latest wafer layout? 
 Thank you very much. 
 
 Verified Answer: RE: On the Wafer layout of AD630SD/883B products by George.Kadziolka 
 Hi Lerry, 
 I'll look into whether there were any die changes. In the meantime, are you seeing any performance differences? Do you purchase bare die or packaged die? Thanks. 
 Cheers, 
 George 
 Verified Answer: RE: On the Wafer layout of AD630SD/883B products by George.Kadziolka 
 Hi Lerry, 
 The attached PDF is the MIL version of the AD630 datasheet. It involves a documentation change. It also applies to packaged parts. You are packaging bare die into your own package, if I understand correctly. 
 AD630SCHIPS is the die only part number. PCN# 07-0092 from Mar/2008 is the last change (100mm to 150mm wafer). 
 So there has not been any changes to the die since 2008. 
 Cheers, 
 George 
 Question: RE: On the Wafer layout of AD630SD/883B products by lerry@surlink-ic.com 
 Which friends can help me answer this question? 
 Question: RE: On the Wafer layout of AD630SD/883B products by George.Kadziolka 
 Hi lerry, 
 I'm not seeing any difference. The pad connections are in the same place. What specific differences are you seeing? 
 Cheers, 
 George 
 Question: RE: On the Wafer layout of AD630SD/883B products by lerry 
 Dear ,George 
 I'm glad to hear from you. 
 Please take a look at these three pictures for me: 
 This is the layout on the datasheet in the specification. 
 
 This is AD630SD/883 DC:2016+ by de-encapsulating the components, and the wafer layout can be seen visually as shown in the figure: 
 
 This is AD630SD/883 DC:2019+ by de-encapsulating the components, and the wafer layout can be seen visually as shown in the figure: 
 
 The DC:2016+ wafer layout is the same as Datasheet, but the DC:2019 wafer layout is a little different from Datasheet, which I marked in red. 
 I would like to ask: why is the layout of DC:2019+ wafers different from that of datasheet? 
 Does the ADI factory have any documentation on changing the wafer layout? 
 I look forward to hearing from you！ 
 Lerry 
 Question: RE: On the Wafer layout of AD630SD/883B products by lerry 
 Dear George 
 When the IC is fully loaded, we see some functional abnormalities. 
 We buy is tape packaged die. 
 We unsealed 2 DC2019 and 1 DC2016. It is found that there are some differences between different DC chips. We checked the chip pictures with the datasheet and found that our product is 2016 + compatible with the datasheet, 2019 + has differences, can be shown in our report pictures. 
 Thank you for your reply. 
 Lerry 
 Question: RE: On the Wafer layout of AD630SD/883B products by lerry@surlink-ic.com 
 Dear George 
 Have you found any news about any die Changes? I have been waiting for your reply these two days. 
 Question: RE: On the Wafer layout of AD630SD/883B products by lerry 
 Ｄear George 
 Have you found any news about any die Changes?　　 
 I'm in a hurry. Can you reply me tomorrow? 
 Thank you f 
 Question: RE: On the Wafer layout of AD630SD/883B products by George.Kadziolka 
 Hi Lerry, 
 The die has not changed since 2016. It is difficult to see what differences you are referring to. I'm not sure if you can get some pictures with more detail. If you are seeing functional abnormalities, we can take a look at them. 
 Cheers, 
 George 
 Question: RE: On the Wafer layout of AD630SD/883B products by George.Kadziolka 
 Hi Lerry, 
 Can you contact the outfit you purchased the die from and ask them to start a return for Failure Analysis? Thanks. 
 Cheers, 
 George 
 
 Question: RE: On the Wafer layout of AD630SD/883B products by lerry 
 Dear George 
 Attached is the test report of this product. The picture in the attachment is clearer. Please help me answer the above questions. Thank you. 
 PDF 
 Thank you ！ 
 Question: RE: On the Wafer layout of AD630SD/883B products by harrynsc 
 Lerry, 
 Where did you buy the parts? 
 Harry 
 Question: RE: On the Wafer layout of AD630SD/883B products by George.Kadziolka 
 Hi Lerry, 
 The Process Change Notification for AD630SCHIPS (available to view on AD630 product page) shows that there have been no changes since 2008. As mentioned, we'd be happy to do a Failure Analysis to understand the issue. 
 Cheers, 
 George 
 Question: RE: On the Wafer layout of AD630SD/883B products by lerry 
 We are looking for an agent to purchase the products. 
 Question: RE: On the Wafer layout of AD630SD/883B products by lerry 
 Then why did this happen? We are looking for an agent to purchase the products. How should we solve this problem? 
 Suggested Answer: RE: On the Wafer layout of AD630SD/883B products by harrynsc 
 But where did you get the water you are looking at?? 
 Question: RE: On the Wafer layout of AD630SD/883B products by George.Kadziolka 
 Hi Lerry, 
 You will need to go back to whoever you purchased these die from and ask them to start a Failure Analysis. 
 Cheers, 
 George 
 
 Question: RE: On the Wafer layout of AD630SD/883B products by lerry 
 Dear George 
 I downloaded a file on the ADI website. Can you help me to see if the original factory revised the AD630 design drawings on July 9, 18? 
 Thank you very much for your patient answer. 
 PDF 
 Question: RE: On the Wafer layout of AD630SD/883B products by lerry 
 Dear George 
 I also want to ask a question about the layout of Datasheet. 
 The wafer layout published by Datasheet (shown in the figure) is this for reference only? 
 Question: RE: On the Wafer layout of AD630SD/883B products by lerry 
 Dear George 
 I also want to ask a question about the layout of Datasheet. 
 The wafer layout published by Datasheet (shown in the figure) is this for reference only? 
 Question: RE: On the Wafer layout of AD630SD/883B products by George.Kadziolka 
 Hi Lerry, 
 I believe it is a reference for pad location on the die. I will check into it. 
 Cheers, 
 George

Question 11

AD7746 - difficulty writing in the offset and gain registers

Accepted Answer

Original Question: AD7746 - difficulty writing in the offset and gain registers by bravos 
 Hello I am working with the AD7746 and I have difficulty writing in the offset and gain registers. The datasheet is not very explanatory on how to do it. I have tried in many ways, but when I access the records (offset and gain) nothing has changed. I thank you in advance for your answers. Bravos 
 
 Verified Answer: RE: AD7746 - difficulty writing in the offset and gain registers by vsethia 
 Have you set the CAPEN=1 in the CAP SETUP REGISTER? Without that the system calibration will not work. 
 Reply: RE: AD7746 - difficulty writing in the offset and gain registers by vsethia 
 Please provide some details on your application and how you are accessing the device. 
 Are you following the read-write sequences as given in Figure 25 of the DS. 
 Reply: RE: AD7746 - difficulty writing in the offset and gain registers by bravos 
 Thanks for your quick reply. 
 1-Prepare to write in offset writeRegister (0x0A, 0xa5); -> 1010 0101 
 2- Write value in offset writeInteger (0x0D, xx) + (0x0D + 1, xx); 
 3- Read the offset (0x0D) readInteger (0x0D); 
 For gain I follow the same procedur, but on the 0x0D regist, and writeRegister (0x0A, 0xa6); -> 1010 0110 
 The changes introduced in the offset and gain registers do not change. 
 Finally, changing the values manually at 0x0B, the results are weak and very noisy. 
 Thanks 
 Bravos 
 Reply: RE: AD7746 - difficulty writing in the offset and gain registers by vsethia 
 Please provide some details on your application and how you are accessing the device. 
 Reply: RE: AD7746 - difficulty writing in the offset and gain registers by bravos 
 Two metal plates mounted on a pvc tube (form a condenser), to count bees entering and leaving a hive. Trying to follow the idea of Paul Perrault and Mike Teachman , in spectrum.ieee.org/.../how-to-build-an-electronic-bee-counter 
 Reply: RE: AD7746 - difficulty writing in the offset and gain registers by vsethia 
 Please share the schematic. 
 Reply: RE: AD7746 - difficulty writing in the offset and gain registers by bravos 
 
 Reply: RE: AD7746 - difficulty writing in the offset and gain registers by vsethia 
 Are there any pull-up resistors on SCL and SDA lines? 
 Reply: RE: AD7746 - difficulty writing in the offset and gain registers by vsethia 
 Also, what is driving the I2C lines of the AD7746.? What are the logic levels of the I2C driver? 
 Reply: RE: AD7746 - difficulty writing in the offset and gain registers by bravos 
 Yes. But they are not visible in this part of the schematic 
 Reply: RE: AD7746 - difficulty writing in the offset and gain registers by bravos 
 The system is controlling by a microcontroller, with levels of i2c (3.3v) 
 Reply: RE: AD7746 - difficulty writing in the offset and gain registers by vsethia 
 You do not have to update the values in offset and gain calibration register if you are using the configuration register to do system offset and gain calibration for a single channel. 
 Further, have you tried to read back any registers to confirm if the write is happening correctly or not.

Question 12

AD5142A Steps for Reading Registers

Accepted Answer

Original Question: AD5142A Steps for Reading Registers by John_Haraguchi 
 Can you provide me the steps for reading back a register from part number AD5142A? 
 I'm able to write to the device, but I'm not having any luck reading back. 
 Both ADDR0 and ADDR1 are grounded in my setup. 
 If you could give me the step by step process for reading back the value stored in EEPROM for RDAC1 I would appreciate it. 
 Please include any details related to start and stop conditions. 
 A timing diagram for performing a read sequence in the datasheet would have been helpful for an old RF guy. 
 Thanks, John 
 
 Verified Answer: RE: AD5142A Steps for Reading Registers by vsethia 
 Hi John, 
 A reference timing diagram is given in Figure 45 of DS AD5110/AD5112/AD5114 (Rev. B) (analog.com) 
 Reply: RE: AD5142A Steps for Reading Registers by John_Haraguchi 
 Hi Vsethia, 
 Thanks for the reply on this one. 
 The timing diagram in this datasheet definitely makes it clear on how to read back data from the part. 
 I tried implementing this in the lab and worked. I was confused for a minute trying to read back the EEPROM value for RDAC2 because the address (A3:A0) changes from 1d to 2d. I just happened to catch this in Table 17. 
 ADI should consider adding a similar timing diagram to the AD5142A datasheet. I didn&rsquo;t think to go and check the datasheet for another part for this information. 
 Thanks again, 
 John 
 Reply: RE: AD5142A Steps for Reading Registers by vsethia 
 Noted.

Question 13

ltc1564 LTspice model?

Accepted Answer

Original Question: ltc1564 LTspice model? by smittyschmitz 
 Is there an LT1564 model or device for use in LTspice? 
 Smitty 
 
 Verified Answer: RE: ltc1564 LTspice model? by Gauzz 
 Hi, Unfortunately there is none at the moment., are there any parameters that you would like to simulate? Let us know what information do you need so we can support you further. 
 Regards, Goz 
 Reply: RE: ltc1564 LTspice model? by smittyschmitz 
 Hi Goz, 
 I'd like to simulate filter response based on fcutoff. I see a chart for that in the data sheet, but would strongly prefer to have simulation results to demonstrate my design. 
 Any thoughts you have are welcome. 
 Best regards, 
 Smitty 
 Reply: RE: ltc1564 LTspice model? by smittyschmitz 
 Hi Goz, 
 Can you help me on this? 
 Best regards, 
 John 
 Reply: RE: ltc1564 LTspice model? by Gauzz 
 Hi John, We apologize for this. We'll put it up on SPICE model request but it will be on queue. As of now we have evaluation boards available if you want to validate your design. https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/dc393a.html#eb-overview Regards, Goz 
 Reply: RE: ltc1564 LTspice model? by ADIApproved 
 Hello. 
 An LTC1564 LTspice model can be build using ideal 2nd order filter models (small signal). 
 The LTspice models symbols and sub circuits must be in the same folder to run an LTC1564 sim. 
 Will provide model tomorrow.

Question 14

AD630 Output Noise Source

Accepted Answer

Original Question: AD630 Output Noise Source by ngilling 
 Hi There, 
 
 I am wondering where to look for possible sources of noise contributing to my glitchy output shown in the image below. Oscilloscope probe is connected to pin 13 of the AD630. We have a board with 4 separate channels, each with 1 AD630. All other channels seem to work fine with clean square waves on the output. Our malfunctioning channel output is shown in the image below. If you need more information please let me know.

Thank you! 
 
 Verified Answer: RE: AD630 Output Noise Source by harrynsc 
 Nick, 
 It's a complicated issue. Let's do a thought experiment. 
 Case one is a part that has ten customers, each one buys $100k/year. So one customer redesigns his 
 product and stops buying. Any semi company would keep making the part. 
 Case two: Ten customers, one buys $910k/year, the other nine buy $10k/year. Do you see where this 
 is going? So the $900k guy goes away. The company would probably obsolete the part. 
 So here's the problem. If we go to the $900k guy and ask him how long he will be making his product, 
 he might say "one year" or "five years" or "I don't know". One year might turn into two, or five years 
 might turn into one if his competitor comes out with a killer product and his business goes away. 
 So if our customers don't know how long they are going to buy parts from us, how can we predict 
 the future. 
 Here's the good news. I think ADI has the best obsolescence policy of anyone. When we announce 
 a part is being obsoleted, we usually give you one year to place lifetime buy orders and then an 
 additional year to take delivery. So if you use 1,000/year, you could give us two orders: one for 
 a thousand parts to cover this year with immediate delivery, and another order for 11,000 parts 
 with 1,000 delivered 12 months from now and 10,000 delivered 23 months from now. 
 So you are covered for the next 12 years of your production. 
 Here's another interesting solution. There is a company called Rochester Electronics that buys 
 the assets of parts going obsolete. The schematics, the test tapes, the mask sets, etc. They 
 have over 8 BILLION die from over 65 companies, including a lot of companies, such as Sipex, 
 that don't exist any more. They have the original Intel 4004 microprocessor. You can't get it 
 from Intel, only them. They obviously charge a lot, but if you need one part to repair a 
 30 year old military radio, it is the exact part, not a second source or a poor copy. 
 I don't know what the criteria is, but not all parts we obsolete go to Roch. 
 Finally, some parts have a next generation part that actually is an upgrade; 
 e.g. OP07 -> OP77 -> OP177 -> ADA4077 
 or OP284 -> ADA4084. 
 99% of the time, these are direct drop ins. 
 I've been lobbying the past year to interest some product line in doing a next gen AD630 
 and some of the multipliers. I did get Barry Gilbert to consider doing a bootleg part, 
 but he died a few months ago. 
 With a $5 billion company, the only parts that make sense for them to do are the large 
 "SOC" parts that sell for lots of money and ship millions. Maybe some engineers will 
 do a small specialty startup and make a lot of these interesting parts. 
 So long term, yes, I would see if the ADA2200 will work for you. 
 Harry 
 
 Reply: RE: AD630 Output Noise Source by harrynsc 
 Are all four channels the same? 
 What do the input waveforms look like? 
 Sounds like a pcb layout problem/coupling? 
 Or a bad part? 
 Schematic in pdf format? 
 Harry 
 Reply: RE: AD630 Output Noise Source by ngilling 
 Hi Harry, 
 We have figured out our issue. It seemed to be due to a somewhat noisy clock that had some glitchiness. When we probed on the clock line (and output with a separate probe), the output appeared cleaner due to the extra ~20pf capacitance on the clock line due to the probe. Thank you for your quick response! 
 I am also wondering about the lifetime of the AD630ARZ part. Obviously it is shown as NRND. Our BOM analysis tool (Silicon Expert) shows this part as NRND as well, but that it still has a EOL date of ~10 years from now. I'm wondering if you could provide some clarity on that. We are looking to design this part out of the board (alternative of ADA2200 possibly), but if it will still be available for 5-10 years we would have second thoughts. 
 
 Thank you! 
 Nick

Question 15

AD538 Equivalent

Accepted Answer

Original Question: AD538 Equivalent by PhilipLehman 
 Hi All; 
 I am attempting to do a tilt sensor using the ADXL203 and an AD538 in a manner consistent with CN-0189 and the suggested circuits in each of the datasheets. Basically I need the AD538 to implement the Arc-Tangent Function as shown in Figure 18 of the AD538 datasheet. 
 I notice that the AD538 is not recommended for new designs. So a few questions: 
 1) When will the AD538 be discontinued? 
 2) What is the replacement for the AD538? 
 3) Could an "equivalent" Arc-Tangent circuit be constructed from available Analog Dev parts that are still in production? Could ADI engineers provide a bit of guidance as to how this might be accomplished? Suggested parts and configuration?? (I am not asking you to do the design) just some guidance given the ADI engineers knowledge of the true internals of the AD538 and familiarity with the application. 
 The tilt function will be used in an Aerospace Application. I CANNOT use a microprocessor. The solution must be accomplished completely in hardware. 
 Thanks in advance for your help. 
 Philip Lehman 
 Answers Aerospace

Verified Answer: RE: AD538 Equivalent by George.Kadziolka 
 Hi Philip, 
 I have a question into the system to see if/when this device will be obsoleted. What is the full part number of the AD538 you are using? I would have to check to see how to implement the Arc-Tangent function with other parts. 
 Cheers, 
 George 
 Reply: RE: AD538 Equivalent by PhilipLehman 
 Hi George; 
 Thank you for taking a look at this. My preferred part is AD538ADZ, but we have some flexibility. Mil-grade temperature range and RoHS are NOT requirements. 
 THX, 
 Philip 
 Reply: RE: AD538 Equivalent by George.Kadziolka 
 Hi Philip, 
 AD538ADZ (and AD538BDZ) will be around at least until 2030. 
 Cheers, 
 George 
 Reply: RE: AD538 Equivalent by PhilipLehman 
 Perfect!!! Thank you so very much! 
 PJL

Question 16

ADA2200 Data Sheet

Accepted Answer

Original Question: ADA2200 Data Sheet by mark-slack@comcast.net 
 Specifications on pg 3 of the ADA2200 Data Sheet, Rev. 0, constrain minimum CLKIN frequency to be from 10 KHz to 2.56 MHz. 
 Within the FAQ and Q&A, there are several examples of statements that contradict the specifications, indicating CLKIN|min = 1 KHz to 1 MHz. 
 My question: In a charge sharing architecture, what are the consequences of failing to meet the required CLKIN|min? 
 
 Verified Answer: RE: ADA2200 Data Sheet by ADIApproved 
 Hello, 
 The minimum input clock frequency is determined by the minimum value of the input sampling frequency, fSI. The minimum value of fSI is 10KHz. 
 This minimum sampling frequency value is set so that will be minimal droop of the sampled voltages while they are being held. The sampling switches are not perfect, and there will be some droop of the held voltage values between samples. 
 Worth noting is that the leakage currents of the switches doubles every 10C increase in temperature. So, the maximum droop will occur at higher temperatures. The minimum CLKIN frequencies were chosen such that, at 85C, the voltage droop will not have a material impact on the the accuracy of the device. 
 The minimum values for CLKIN, reflect this 10KHz minimum value for fSI: 
 CLKIN(min) = 10KHz x CLKDIV 
 So, the minimum value of CLKIN always results in an fSI of at least 10KHz. 
 Brian

Question 17

ADL5391 Outputs single ended

Accepted Answer

Original Question: ADL5391 Outputs single ended by swapro 
 Dear ADI Expert, 
 in my application the ADL5391 has to drive a single ended input from DC to a few MHz. For symmetry both outputs WP and WM of ADL5391 are connected by 200 Ohms to GND (COMM). Surprisingly to me the outputs do not swing symmetrically around the common voltage VPOS &minus; 2.5 (i.e. 2.5V in my case), but around 1.8V. 
 In the same application a second ADL5391 drives the inputs XP and XM of another ADL5391 differentially, but the mean output voltage (WP+WN)/2 is 2.25V, not 2.5V. 
 How do the outputs swing single ended?? Is it somehow related to the common mode voltage of any input? 
 Kind regards, 
 Dipl.-Ing. Sven Probst. 
 
 Verified Answer: RE: ADL5391 Outputs single ended by swapro 
 After increasing the load to approx. 680 Ohms to GND the common mode voltage is about 2.2V. Didn't check how small the load resistor can be ...

Question 18

ad834 rev. F

Accepted Answer

Original Question: ad834 rev. F by santiagoandany 
 Hello, 
 Figure 23. Wideband Three-Signal Multiplier/Divider is incorrect in Rev. F of the datasheet: The Y2 input of the lower ad834 is incorrectly left floating. 
 
 Verified Answer: RE: ad834 rev. F by Fdelaram 
 Hi, 
 Thank you for pointing this, we will check with the product owner. 
 Regards. 
 Reply: RE: ad834 rev. F by Fdelaram 
 Hi, 
 The unused pin should be terminated to the ground through a single resistor. 
 
 Again, thank you for pointing this out. 
 Regards.

Question 19

ADCMP607 - why example circuits have external 50R pull ups?

Accepted Answer

Original Question: ADCMP607 - why example circuits have external 50R pull ups? by m3atwad 
 Hello, 
 
 Why does the data sheet show internal 50R pullups as part of the CML outputs as shown below:

But in the example circuits each one has external 50R pullups on the output. Are you required to use the external 50Rs? This will be driving 50R transmission lines to another CML input.

Any guidance is greatly appreciated! 
 
 Thanks! 
 
 Verified Answer: RE: ADCMP607 - why example circuits have external 50R pull ups? by Jvillanu 
 Hi, 
 No need for this pull up if your circuit will be connected to a CML input receiver with an internal pull up of 50 Ohm, and yes it is correct to have a 50ohm line impedance. 
 If in case your CML receiver does not have an internal 50 Ohm pull up, you can use a 50 Ohm pull up near the input of your CML receiver with still, 50Ohms line impedance. 
 Both condition will enable proper line termination. 
 
 Regards, 
 joven

Reply: RE: ADCMP607 - why example circuits have external 50R pull ups? by m3atwad 
 Thank you for the help!

Question 20

ADCMP607 EVAL-BOARD schematic

Accepted Answer

Original Question: ADCMP607 EVAL-BOARD schematic by yoichi_mac 
 Hi Support team 
 I need EVAL-ADCMP607 schematic. 
 It does not seem to be published on the web. 
 Best reagrds, 
 
 Verified Answer: RE: ADCMP607 EVAL-BOARD schematic by ADIApproved 
 Hi, 
 Please check the attached file. ez.analog.com/.../8877.02_2D00_010135_2D00_01_2D00_a_2D00_1.pdf 
 Suggested Answer: RE: ADCMP607 EVAL-BOARD schematic by yoichi_mac 
 Thank you for your reply!

Popular Forums

Product Forums

Application Forums

Design Center Forums

Highlighted Webinar

Places

Libraries

Challenge Yourself!

What's Brewing

Places

Resources

Visit ContentZone

The Latest Read

New Release

Recent Technical Insights

Questions