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ADC12D1800RB: Compatibility of the ADC12D1800RB with the ADC12D1600

Daniel Vasher
Intellectual 1135 points

Part Number: ADC12D1800RB

Hello all,

Can the ADC12D1600 device be used on the ADC12D1800RB EVM?   Meaning I have the ADC12D1800RB but would like to replace the ADC12D1800 device with the ADC12D1600.

Also both EVM’s the 1600 & 1800 have a FPGA MOD  but the 1800EVM has a FMC connector.  What are the pin out and or signals, and what are the levels of the signals.

  • 0
    TI__Mastermind 43930 points

    Hi Daniel

    The ADC12D1600RB product folder shows shows the earlier revision of the board. Current production of the ADC12D1600RB uses the same PCB with FMC connector that is used for the ADC12D1800RB and ADC12D1800RFRB.

    If you want to evaluate the ADC12D1600 device, please procure the ADC12D1600RB. The on-board clocking of these boards can only operate at the designated clock rate, so the ADC12D1800RB would operate at 1800 MHz clock rate only.

    The ADC data transmitted via the FMC connector is output by the Xilinx Virtex-4 FPGA using standard LVDS signalling. The pinout can be seen in the ADC12D1800RFRB design package here: http://www.ti.com/lit/zip/snac040

    Best regards,

    Jim B

  • 0 in reply to Jim Brinkhurst1
    Prodigy 105 points
    I contacted TI customer support yesterday with a similar question and was eventually directed here. Unfortunately this only answers part of the question I was asking.

    I have an older 2010 National Semiconductor version version of the ADC1XD1XXXRB EVM. I need to know if I can run the newer 1800 version chip on this board.

    Also, would it be necessary to reprogram the FPGA to access the signals at the FMC (Mictor connector in this case)?

    Thank you.
  • 0 in reply to Jeremy Bonsall
    TI__Mastermind 43930 points

    Hi Jeremy

    Thanks for the additional background.

    The board you have should work if you replace the ADC with a newer version of the same ADC. The board ID will configure the firmware specific to the ADC version, register map, etc., so putting an ADC12D1800RF device on an older ADC12D1800RB (nonRF) wouldn't work properly. The on-board clocking will only work at the speed it is intended to, so an ADC1XD1800RB will only ever run at 1800 MHz. External clock mode would allow other rates.

    The older boards have the Mictor expansion connectors, but we never developed any firmware that provided data on those connectors. If you want that feature the best solution would be getting one of the new boards with the FMC connector. Another disadvantage of the Mictor expansion connectors is there aren't enough signals there to output both channels of the ADC in demux mode, even if you did add the firmware features needed.

    I hope this is helpful.

    Best regards,

    Jim B

  • 0 in reply to Jim Brinkhurst1
    Prodigy 105 points

    Hi Jim,

    That helped quite a bit, thank you.

    I just have a couple more questions:

    1) What exactly is the difference between the RB and RF parts? I don't see a lot of information describing that.

    2) Does the RB evaluation board come with the FMC connector? The picture and the first user guide link on the product page have the Mictor connectors. But later on the page there is another link to the RFRB user guide which has the FMC connector so I'm a little confused as to what I would get if I ordered the RB evaluation board.

    Thanks,

    Jeremy

  • 0 in reply to Jeremy Bonsall
    TI__Mastermind 43930 points

    Hi Jeremy

    Regarding the latest questions.

    The relevant ADC and EVM part numbers are as follows:

    • ADC12D1800 device - evaluation board part number is ADC12D1800RB
    • ADC12D1800RF device - evaluation board part number is ADC12D1800RFRB

    The part differences are discussed in this document:

    https://e2e.ti.com/cfs-file.ashx/__key/communityserver-discussions-components-files/68/5773.GSPS-ADCs-RF-versus-non-RF.pdf

    Current inventory of both the ADC12D1800RB and ADC12D1800RFRB use the same bare circuit board, which has the FMC expansion connector. I'm working to get the online documentation updated.

    Best regards,

    Jim B