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DAC8734 - Is this power sequencing OK?

Patrick Dietrich
Prodigy 40 points
Other Parts Discussed in Thread: DAC8734

Hi There,

Could you please check my DAC8734 power sequencing below.  I realize I have ref-x coming up before AVDD, but I was wondering if that is actually an issue.

We are having issues getting expected behaviour out of the DAC outputs, after shifting in our SPI transactions. 

Thanks,

Patrick 

  • 0
    TI__Genius 10615 points

    Hi Patrick,

    Patrick Dietrich said:
    I realize I have ref-x coming up before AVDD, but I was wondering if that is actually an issue.

    Unfortunately yes, this can cause an issue. Anywhere from total device latch-up, or bad offset and gain errors.

    How about AVSS? When is it powered on?

    What are the issues that you are experiencing?

    If you can share some scope captures of the digital interface and a schematic, I can take a look to make sure everything is in order.

    If you would like to share this information privately, is it okay to contact you to your E2E registered email?

  • 0 in reply to Eugenio Mejia
    TI__Genius 10615 points
    This thread has been taken offline.