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DAC8728EVM: DAC8728EVM PCB Routing Discrepancy

RICK SIMON
Prodigy 160 points
Part Number: DAC8728EVM

We are seeing some things where the DAC8728EVM PCB does NOT agree with the schematic. 

For example, for J1, all of the even pins 2-20 are connected to DGND as shown in the schematic for the EVM.  For J6 however, none of the even pins 2-32 are connected to DGND even though the schematic shows they should be.  We verified this by measuring with a multi-meter in ohms mode.  Is the schematic wrong or did the J6 connector just not get routed per the schematic?  Which is correct, the schematic or PCB?

  • 0
    TI__Mastermind 19086 points

    Hi,

    As per the schematics, all even pins of J6 connector should be grounded. Did you check the continuity between pins of J6 or between J6 even pins and J1 even pins?

    I don't have the EVM with me right now to check this as we are working from home. Bu I believe the layout has done according to the schematics in the EVM user's guide.

    Regards,

    AK

  • 0 in reply to Akhilesh K
    Prodigy 160 points

    I checked the pins of J6 with a meter between themselves and to DGND.  None of the even pins of J6 are connected to each other or DGND even though the schematic says they are.  I really think there is an error on the PCB.  Also, did you get my direct emails?  Thanks, Rick

  • 0 in reply to RICK SIMON
    TI__Mastermind 19086 points

    Hi,

    Yes, I got your email.

    We can have this discussion offline, as I trying to get the source evm files for to verify.

    Regards,

    AK

  • 0 in reply to Akhilesh K
    TI__Guru 53773 points

    Hi Akhilesh and Rick,

    I have confirmed this by looking at the original design.  The connector J6 is not connected to ground.  I am not sure why this occurred, as the schematic and netnames are correct.  I have confirmed that other connections are all valid, it just seems to be the ground pins on J6 only.  

    Thanks,

    Paul