ADRV9003 Queries

Hi,

 

We wanted to know the following about the ADRV9003:

(a) Minimum Bandwidth at zero IF available in the ADRV9003: From the datasheet we found that the minimum channel bandwidth was 12.5KHz. We wanted to use it for channel bandwidths of 8.33KHz as well. Is it possible to tune the FIR available in ADRV9003 ?

(b) Is there a dedicated Evaluation board available for ADRV9003 ? We were unable to find a dedicated eval board for the ADRV9003.

 

With Regards,

Avinash

 

 

Parents
  • +1
    •  Analog Employees 
    on Apr 29, 2021 1:06 PM

    Hi Avinash,

    For all intents and purposes the ADRV9003 is exactly the same as the ADRV9002, just without Tx2. All documentation, measurements and user guides remain the same.

    There is only one Evaluation Board available, with the ADRV9002 fitted. The TES software simulates all subsequent products in the family using a drop down menu in the configurations tab. 

    We have a webinar recorded which goes into details on the product family:
    https://ez.analog.com/webcast-qa/2021-webcasts/3-4-21-agile-sdr-transceivers-khz-to-40mhz-bw-with-advanced-system-features/

    This should clarify any outstanding issues.

    Best Regards,
    Oisín.

  • Hi Oisin

    I am a bit confused. This is because from the datasheet of the ADRV9003, it is specified that there are 2 Receivers (RX1 & RX2) & 1 Transmitter (TX1) & that the two RF receivers intend to match to different bands implying that the two receivers can be tuned to two different frequencies having two different LOs. Is my above stated info correct or am I missing anything ? 

    With Regards,

    Avinash

  • Hi Oisin,

    I still had a few clarifications.

    (a) Since u have mentioned that the ADRV9003 support 1T 1R or 1T 2R configuration, it is still confusing as the datasheet of the ADRV9003 says that it is 1T 2R configuration whereas the user guide says 1T 1R configuration. This has become quite important that we obtain the clarification as our application requires us to use 1T 2R configuration and more specifically with all of them having independent LOs since we want each of the receiver to be tuned to different frequencies. Is this possible with the ADRV9003 ? 

    (b) Secondly the datasheet of the ADRV9003 does not say anything about the ADC/DAC width (Only the Auxiliary ADC/DAC are mentioned). However from the Programming guide, we come to know that there are two versions - 16 bit & 5 bit. Does the same hold for the ADRV9003 as well ?

    (c) Is there any restriction on the least IF & Maximum IF i.e., can we get the signal down to zero IF ? I assume that the restriction is only on the least bandwidth achievable through the combination of the LPF & the digital FIRs that are presnt ie., 12.5KHz ; Meaning if I have a message bandwidth of 5KHz, will the IC still support it ?

    (d) Can the LPF (Analog) in the Tx/Rx be bypassed ?

    (e) Is there a summer available at the output of the TX from the I & Q channels ?

    Sorry for the long list of questions, but there were some confusions after the differences between the user manual & the datasheet. We just want to be sure if ADRV9003 is the right product for us for the mentioned configuration.

    Regards,

    Avinash

  • 0
    •  Analog Employees 
    on May 28, 2021 9:11 AM in reply to AKoushik778

    Hi Avinash,

    Not to worry, I'll try and clarify all I can here:

    a) The ADRV9003 can support applications that require either 1T 1R or 1T 2R, the device itself has 2 Rx channels. As to your requirement of each RF signal chain having independent LO's, I do not believe this will be possible with the ADRV9003. This device has 2 on-board LO's, either of which can be slaved to any of the RF signal chains. But for each RF signal chain to have fully independent LO's you would need a third LO, which cannot be supported in this product. Depending on your application however, you may be able to use something like Fast Frequency Hopping with the Automated TDD state machine to allow for fast retuning of LO's and switching of RF signal chains. Will that be possible for your application?

    b) Yes, the ADRV9003 has 2 options for Rx ADC's, exactly the same as the ADRV9002. We provide a High Performance ADC (5-bit Continuous Time Delta-Sigma) or a Low Power ADC (16-bit VCO architecture ADC).

    c) This product family can support Zero IF applications. Your message Bandwidth restriction should not be an issue for this product.

    d) The LPF in the Analog Front End cannot be bypassed, however it is worth mentioning that this filter really does not do very much filtering. The Tx LPF is 2nd-order Butterworth shape, however there are more configuration options for the Rx LPF. Read through the RECEIVER / OBSERVATION RECEIVER SIGNAL CHAIN - LPF section of the User Guide for full details.

    e) I'm afraid I can't understand your question, was the word "summer" in the question a typo? If you get back to me with a clarification I can certainly find you an answer.

    Again it's never a problem to have a lot of questions! Let me know if there's anything in my responses that needs clarification.

    Best Regards,
    Oisín.

  • Thanks a lot for the clarifications Oisin, Much appreciated.

    (a) From the datasheet of the ADRV9003, it is stated that " There are two RF inputs for the receiver to match to different bands in one reference design " from which we inferred that it was possible to use two independent LOs for the Receiver. Basically our application requires two receivers in the same frequency band of which one is tuned to a frequency and is monitoring data in this frequency channel. The other receiver is in tune with the transmitter on a different frequency in the same frequency band. This was the whole reason that we were looking to choose ADRV9003 since it had two receivers & a single transmitter. But from your answer, it seems that, although there are two LOs for each of the chains, they are unable to operate at different frequencies ?

    If the ADRV9003 is not able to do this , could you please let us know if there is any other transceiver in the same portfolio which can help us achieve our requirement ?

    (b) & (c) are clear

    (d) Our intention to bypass the filter was because we wanted to get the input to an IF of around 100MHz to avoid the image frequency & also probably further downconvert to a lower frequency through the DCO in the digital section so that it can be further processed by the FPGA. For this bypassing the LPF seemed the only option. Also , we wanted to avoid the zero IF to prevent the problems due to the zero IF conversion. I will explore the programming guide for further investigation.

    (e) By summer, I was trying to know if the I & Q signals are getting added at the output of the transmitter.

    With Regards,

    Avinash

  • +1
    •  Analog Employees 
    on May 28, 2021 11:22 AM in reply to AKoushik778

    Hi Avinash,

    a) Ah okay! I understand you now, I was confused by your previous wording. Allow me to be entirely explicit. The ADRV9003 has 3 RF Signal chains (1 Tx, 2 Rx) and 2 LO's. Those 2 LO's can be multiplexed to any or all of the signal chains. So your initial understanding of the part is entirely correct.

    For your application, if you were to use an FDD setup, you could slave LO1 to Tx1 and Rx2, giving you 2 RF signal chains operating at the same frequency that never turn off. You could then slave LO2 to Rx1, which would handle your monitoring. If you were to use TDD, you could slave LO1 to Tx1 and Rx1, then slave LO2 to Rx2. So this product should fit your application perfectly fine in this regard.

    d) Yes, I do believe you can still achieve your goals without the need to bypass the filter. Have a read of the guide and see what you find.

    e) I understand you now! Yes, we do sum the I and Q signals at the output, this high level block diagram shows the summation on the left hand side:

    I hope this clarifies matters!

    Best Regards,
    Oisín.

  • Thanks Oisin, I think it clears up most of the matters. I shall come back after I refer to the user guide in case I need any more clarifications. Thanks a lot for your time. Much appreciated.

    With Regards,

    Avinash

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