In the ADL5565 amplifier at 6750 MHz (gain 6 dB) can I have output voltage 1 Vpp (single ended)?
The output swing of the ADL5565 is limited by the following specification. Output Swing x Bandwidth Product = 2000 V MHz p-p.
So 2000 V MHz p-p / 6750 MHz = 0.296 V p-p max for a differential swing. So for a single ended output the maximum voltage is 0.148 V.
That means at 1000 MHz will have output 2 Vpp differential without distortions? Right?
As the frequency increases the distortion also increases. At 500 MHz, The harmonics are about 10 dB worse than they are at 500 MHz.
So how I can get at 6750 MHz output 1 Vpp differential?
At 6750 MHz you can't get 1 Vpp differential from the ADL5565.
Interesting, but in the datasheet in the specifications is written that at 6750 MHz can be 1 Vpp differential output.
How are you explain it?
What you have listed above are test conditions, not operating conditions. The end user is bound by the Absolute Maxmimum Rating stated previously: Output Swing x Bandwidth Product = 2000 V MHz p-p. Based on that limitation the user is not to exceed a differential output voltage of 0.296 mVp-p at 6750 MHz.
Dear Jim, unfortunately I can't accept with you.
Looking on your answer we can not trust to the "Test Condition/Column" column at all?
6.75 GHz is mentioned on the third page and any engineer immediately ask you on what amplitude this test was performed. Looking on your Data Sheet the test should be done at least at 999 mVpp amplitude, but not at 296 mVpp.
Once more: on what amplitude you test 6.75 GHz?
6750 MHz is the 3 dB band width of the part at a gain setting of Av = 6 dB. The only, meteric being mentioned is the output swing, are there any other prformance requirements for this application? Distortion, linearity, etc?
I return to my questions: on what amplitude you test 6.75 GHz?
Please answer me on that question.
I verified the output test level was 1 V p-p. At 6750 MHz, the 3 dB bandwidth the output level will have rolled to 0.707 V p-p. As stated earlier this is a test condition and the device only see that voltage level for a few micro seconds. For continuous use in real world settings the output swing is bound by the absoute maximum ratings and may not exceed 0.296 Vp-p.
I have seen this table. Absolute Maximum Ratings are conflicting with specifications mentioned in the Condition table. The Absolute Maximum Ratings cannot be below normal operation specifications that are written on 3 - 8 pages of ADL5565 datasheet.
As I understand you overdrive Absolute Maximum Rating (6750 MHz x 0.707 Vpp = 4772,25 Vpp MHz) in test time. The overdrive is more than 2 times. According to your listed information it means that the product was permanently damaged. So, it is a one-time usage product.
If this parameter is important for normal operation condition of product, it should be mentioned to table of specifications, near bandwidth or output swing specifications. Do you agree with me?
The bandwidth is measured on a Vector Network Analyzer. The sweep time is in the order of microseconds.( low duty cycle) so there is very little increase in the average current consumption. If you operate at or above the maximum ABS rating continuously you will see an increase in power dissipation which increase the thermals and reduce the over all life of the part.
Operating any parameter Maximum Ratings Conditions for extended periods may affect device reliability.
I will not agree to operating the device at 6750 MHz with a 1 V p-p output ofr nor ma l operation under any circumstances.
It seems we can't find the same view on the test conditions.
However am I right that I can use the ADL5565 as follows:
2 GHz @ 1 V pp
3.5 GHz @ 571 mV pp
6.75 GHz @ 296 mV pp
Now I have not a continuous sine-wave but amplitude modulated 6 GHz sine-wave. Modulation has duty cycle near 10. Means period = 10 us while pulse width = 1 us.
May I have 1 V pp output swing?
What distortions will be?
I will have to do some investitagion and see if the 1 Vpp withe proposed dutycycle will be acceptable. The distortion will be bad. I can say because I can test beyond a 3 GHz frequency. At 3 GHz wiht a 0.666 Vp-p signal HD2 is -47 dBc, 0.1 V p-p signal HD2 is -60 dBc.
For me it is generally interesting how to test the ADL5565 higher than 3 GHz with proposed evaluation board I have received. The board used front-end transformer specified up to 3 GHz only.
Are you sure that you tested this device higher than 3 GHz at all?
Look on the first page on your datasheet. It is written that the first application is "Differential ADC drivers". It is generally time domain instrumentation. How can we use your device if you didn't test it on half of frequency range. We are designers and manufacturers of 20-GHz sampling oscilloscopes, but we can't imagine that we test them up to 10 GHz only.
The primary application for this part is drving highspeed ADCs at IF frequencies. In order to get the low distortion at 100 MHz - 200 MHz, it was neccesary for the part to have the wide bandwidth. Other than bandwidth no other parameters have been characterized above 500 MHz.
As I understand, It was developed as driver for high speed ADCs (DC - 6 GHz), at first of all. It is key position of usage. It should be so. You did not test ADL5565 above than at 3 GHz frequency. I understand correctly?
Except for noise figure (1 GHz) and bandwidth, no charcterization was performed above 500 MHz.
Can I get answer?
This specification is very important for my design.
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