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ADS42LB69EVM interface to FMC-ADC-Adapter

Craig Beal
Prodigy 20 points
Other Parts Discussed in Thread: ADS42LB69EVM, FMC-ADC-ADAPTER, ADS42LB69

Hello,

I just received an ADS42LB69EVM evaluation module which I hoped to be able to interface to my Xilinx KC705 FMC slot using the TI FMC-ADC-ADAPTER.  Both use a SAMTEC Qstrip series connector (QSH on the adapter and QTH on the ADS board).  Both are electrically pin compatible.  However mechanically these two boards do note mate.  The ADS board has two large pins on either side of the connector which appear to be used for mechanically supporting the connection.  The Adapter board does not have a mating socket for these pins and consequently the pins interfere with bringing the boards together.  

Upon taking a closer look at this document:  http://www.ti.com/lit/ml/slab058/slab058.pdf it is clear that the ADS42LB69EVM is not supported by the adapter card.  This is surprising and unfortunate since it seams to be so close to being compatible and because so many similar products are supported.  

My question now are:

Is there a different adapter that will let me connect the ADS42LB69EVM to an FMC connector on my Xlinix KC705 board?

Is there an adapter to go between the two non-mating connectors?

Is it possible to replace the connector on either board with one which will mate? 

For use in the lab is it possible to cut these interfering pins off using a dremel tool and mate the connectors?

Any suggestions or advice would be appreciated.

Craig

  • 0
    TI__Genius 12965 points

    Hi Craig,

    The the connector on the ADS42LB69 was designed with the locking tabs in place to connect better to the TSW1400 which is its native evaluation platform.  The FMC-HSMC adapter was created prior to this change and has not been update to attach to this new locking connector.

    The are a couple of options to make this work - some of which you have outlined.

    The connector can be replaced and we can offer this service free of charge if you wish to wait 1 week or so for the shipping and replacement service.  We would generally replace the connector on the ADC evm.  We have in the past also just cut off the offending portion with the pins if you have the facilities to do so.

    Before committing to either option, please confirm that the pinouts will work. We have seen in some instances where the FMC pinout connections on the FPGA have changed and the pinout required by the ADC is no longer valid.  If you confirm that the pinouts through the adapter are ok, then please let us know how you would like to proceed.

    We can support as needed.

    Ken.

  • 0 in reply to Ken C
    Prodigy 20 points

    Hi Ken,

    Thanks for your reply; it was very helpful.  I decided to modify the connector for my self.  This was easily done by using a pair of end cutters.  I then had to use a needle file to file down a portion of the plastic shroud on the ADS42LB69EVM to get it to mate to the adapter.  The pin outs were compatible although the adapter board flipped the polarity of the differential signals.  This was corrected by inverting the inputs in the FPGA code.  

    Thanks again,

    Craig