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TPS7A94EVM-046: missing connection?

Ryuichi Iino
Prodigy 20 points
Part Number: TPS7A94EVM-046

Hi,

I looked at the user's guide of TPS7A94EVM-046,

The PCB Layout on page 5 and 6,  I can't find out input BNC connector to

Device input connection.

I found device to J3-1,2 input trace has stub, so I guess input polygon pour is shelved on Second Middle Layer.

PDF pictures are not clear enough, if you can open the design file it could be better.

Thank you.

  • 0
    TI__Mastermind 29320 points

    Hi Ryuichi,

    There should not be a missing connection, the input power plane should be inside the inner layers of the EVM.  I will recheck later today in the lab, but it looks like there was an error generating the drawings.  We received many copies of these EVM's and they were tested using the BNC connectors, so the inner layer copper should be there.  I will response later today with a DMM measurement confirming this, and we will work on updating the drawings.

    Thanks,

    Stephen

  • 0 in reply to Stephen Ziel
    TI__Mastermind 29320 points

    Hi Ryuichi,

    I have measured multiple TPS7A94EVM-046 here in the lab and confirmed that the inner VIN plane from the BNC connector to the device is present in the fabricated designs.  Additionally, the assembly house must test the EVM's prior to shipping, and one of the tests is to apply power to J1 and confirm proper operation of the EVM.  Here is how the artwork looks:

    We'll work on updating the User Guide.

    Thanks,

    Stephen

  • 0 in reply to Stephen Ziel
    Prodigy 20 points

    Hi, Stephen

    I know, the real EVB should be OK, just printing bugs.

    I use Altium, so I guessed what happened.

    All, layers of large part polygon plane is connected to GND.

    I would like to get the TPS7A9401, it would be so nice on low jitter crystal oscillator,

    audio dac and so on.

    Thanks,

    Ryuichi