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PCM3168A: Converting DC values

Alberto Gianelli
Prodigy 10 points
Part Number: PCM3168A
Other Parts Discussed in Thread: PCM3168

Hello everyone, 

I would like to use the PCM3168 Codec for both converting audio and control DC signals.  I have seen from the datasheet that it is possible to selectively disable the input High Pass Filters on each channel, so that the internal voltage reference can be converted. The datasheet also reasonably suggests to put a series capacitance for AC coupling the input signal, since this device is thought for audio processing, that in this application case i would, of course, omit since I would need an DC coupled input.

 My question is: are there any "hidden" series capacitance or any HPF on the input path that are not specified in the datasheet that would make impossible the conversion of a DC signal? I am pretty positive that I can achieve my goal by deactivating the HPF, but I would like to double check.

Thank you for your assistance.

Best regards,

Alberto Gianelli

  • 0
    TI__Expert 5645 points
    Hi Alberto,
    Welcome to e2e Forum!

    I will look into the input signal path by checking w the design team and also running some tests on bench. I'll update you once i get the results to get you the answers. Thanks!

    Best regards,
    Ravi