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OPA2376: Two Different Audio

JDJ
Expert 4506 points
Part Number: OPA2376
Other Parts Discussed in Thread: OPA376,

Hello, 

When there is two different input, is there any concern due to channel separation (0.5mV/V)? Or any recommendation on how to limit concerns? 

When the IC is off, does input pins (IN_A) affect to audio signal even if there is coupling cap? 

Thanks!

  • 0
    TI__Guru 68171 points

    JDJ,

    You should not be concerned because there is a typo in the OPA376 datasheet showing dc channel separation of 0.5mV/V;  in fact, it is 0.5uV/V (126dB) - see graph in Fig 20.

  • 0 in reply to Marek Lis
    TI__Expert 4506 points

    Thank you for answering this! 

    For my second questions, when IC is off, does input pins (IN_A) affect to audio signal even there is coupling cap?

    Can you confirm this does not have an impact? 

    Thanks,

    Jack

  • 0 in reply to JDJ
    TI__Guru 68171 points

    Jack,

    I am not sure what you mean by IC is off -  did you turn off supply voltage and if so is it 0V or it is floating?  You cannot disable one channel in OPA2376.  In any application related question, please attach a schematic and pose your question referencing it to your circuit diagram.