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HSMC-ADC-Bridge/ADS42LB49EVM compatibility

Willy Lin
Prodigy 20 points
Other Parts Discussed in Thread: ADS42LB49EVM, HSMC-ADC-BRIDGE, ADS42LB49, ADS42B49, ADS42B49EVM, ADS42LB69, ADS42LB69EVM

Hi,

I currently have the RevA schematic for the ADS42LB49EVM, but physically have the Rev B of this board. Looking at the pinouts on the schematic, there are differences in the pinout supplied on the ADC side compared to the ADC side of the HSMC-ADC-Bridge Rev B schematic. I have the Rev C of this bridge, but I am fairly sure that the documentation is compatible.

First off, is the Rev A schematic for the ADS42LB49EVM compatible with the Rev B ADS42LB49EVM board?

Secondly, if it is, the schematic for the EVM shows pins used on the right side of the top part of the ADS output. The schematic for the Bridge does not have any inputs on the right side of the top part of its ADS output. It seems to me that the data on these pins will be lost once connected. Is there any remedy for this?

Thanks.

  • 0
    TI__Genius 9695 points

    Hi Willy,

    The schematics for both REV A and REV B are compatible. I have attached the REV B schematic to this post.

    4428.ADS42LB49_69EVM-SCH_B.pdf

    The HSMC-ADC-Bridge is not fully compatible with the ADS42LB49 because pins DA14 and DB0 connect to ground on the bridge. You could however use it for channel A only because pin DA14 is not used in ADS42LB49.

     The TSW1400EVM is fully compatible with ADS42LB49 and can be used to evaluate both channels.

    Thanks,

    Eben.

  • 0 in reply to Ebenezer Dwobeng
    Prodigy 140 points

    Ebenezer,

    Are there any EVMs  (dual 14 bit, 250 Msps or so, LVDS) compatible with the HSMC interface?   I would like to use one like WIlly -- with the Altera SoCKit platform for the Cyclone V SoC -- these shorted pins are a shame.

    I guess I don't have to have the exact ADC but I would like something close that I could interface to my design.

    Thanks,

    Lance

  • 0 in reply to lance_RFdude.com
    TI__Genius 9695 points

    Hi Lance,

    Yes there is. Take a look at ADS42B49: 

    http://www.ti.com/tool/ads42b49evm

    Thanks,

    Eben.

  • 0 in reply to Ebenezer Dwobeng
    Prodigy 140 points

    Thanks Eben, indeed that looks like it will work.    I need to review all the details again but I don't see any shorts and the pins seem to map across the interface.

    glad I posted.     BR

    Lance

  • 0 in reply to Ebenezer Dwobeng
    Prodigy 20 points

    Hi Ebenezer,

    Thank you for your help!

    It is unfortunate that I can only use channel A with the 42LB49 chip. I will look into the suggestion you gave to Lance.

    One question I have is that the schematic you supplied me shows the ADS42LB69 chip with the DA14 and DB14 pins on the pinout. I was assuming, as you did, that the ADS42LB49 simply did not connect the pins where the 14 pins are shown. However, looking at the datasheet for this chip family (which isn't on the ADS42LB49EVM page; I cannot remember where I found it), I see that the pinout for the chip differs slightly. It shows the same for the 69, but the 49 has pins 39 and 40 not connected and pins 9 and 10 not connected. This would mean that the bridge would not pass through all of channel A's data, but would pass through all of channel B's data.

    Could you let me know which is the correct pinout for the 49?

    Again, thanks for your help.

    4762.ads42lb49_datasheet.pdf

  • 0 in reply to Willy Lin
    TI__Genius 9695 points

    Hi Willy,

    Follow the pinout in the datasheet. I did not check that when I posted earlier. Thank you for the correction. As you rightly pointed out, this will mean the bridge can pass Channel B's data and not channels A's data. If you need to access the datasheet for the ADS42LB49, you can find it here: http://www.ti.com/lit/ds/symlink/ads42lb49.pdf

    Thanks,

    Eben.

  • 0 in reply to Ebenezer Dwobeng
    Prodigy 80 points

    The ADS42LBx9EVM User Guide (slau465a.pdf) states that this board "is also compatible with Altera and Xilinx FPGA development platforms which have FMC or HSMC connectors, via the appropriate interposer card."

    Other parts of TI's site describe The HSMC-ADC-BRIDGE card as being suitable for connecting TI ADC boards to Altera HSMC boards.  However the above document neglects to mention that this "interposer" card available from TI does not work.  

    So my question is: does anyone know whether an "appropriate interposer card" is available?   

  • 0 in reply to Patrick Pribyl
    TI__Guru* 91947 points

    Patrick,

    I will look into this for you. Did you order the HSMC-ADC-BRIDGE card? When you mention "Does not work" can you tell me what the issue was?

    Regards,

    Jim

  • 0 in reply to jim s
    Prodigy 80 points
    Sorry, I neglected to mention I had purchased the ADS42LB69EVM.

    Unfortunately, yes, I ordered the bridge card, the ADS42LB69EVM, and an Altera card from Terasic before I found this out. (Cyclone V GX Starter Kit).

    As per Ebenezer Dwobeng's note above, the connections to ADC pins DB0P, DB0M, DA14P, and DA14M all go straight to ground on the ADC connector on the Bridge card (J2 pins 43,45,49,51).

    I had hoped to avoid buying the full Quartus II suite, necessary if one is to program the Stratix IV chip on the TSW1400EVM.
    Thanks
  • 0 in reply to Patrick Pribyl
    TI__Guru* 91947 points

    Patrick,

    What is the application you are planning for this ADC? Is there something you need added to the function of the TSW1400EVM? We are constantly adding features to this platform and maybe can do something for you.

    Regards,

    Jim