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ADS52J90EVM: How to modify the board to accept DC signal?

HENG XU
Prodigy 40 points
Part Number: ADS52J90EVM

My input signal comes from optical sensor. The application is to measure light intensity. Signal bandwidth is about 0-1MHz. All the channels on the EVM board are AC coupled through Transformer or capacitor. How do I make changes to test the DC coupling? 

Thank you

  • 0
    TI__Genius 12025 points

    Hi,

    Thanks for using ADS52J90EVM.

    We will forward your question to our group engineer.

    Thank you!

    Best regards,

    Chen

  • 0 in reply to Chen Kung
    TI__Genius 12025 points

    Hi,

    Most likely you need to get an OPA EVM board and do something like this.

     

  • 0 in reply to Chen Kung
    Prodigy 40 points

    Hi, Chen,

    Really appreciate your feedback. However, your reply didn't seem to address my question. I am asking about modifying the signal path on the ADS52J90EVM board to measure DC signal so square wave is measured as a square wave. With current AC coupling design, the square wave is heavily warped. Some of your evaluation boards such as ADC34xxEVM have DC coupling options by soldering adjustment.  Is there a way to do it on ADS52J90EVM?  or I would have to make my own board following ADC34xxEVM DC coupling design? 

    Thank you.

    Heng