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TAS5756M: DAC_OUT same as using a PCM5122?

Part Number: TAS5756M
Other Parts Discussed in Thread: PCM5122

Since the TAS5756M and PCM5122 share the same digital frontend, I assume you can achieve the same with a PCM5122 as you could with a TAS5756M from the DAC_OUT(A/B) pins. Is this correct?
If so: could these DAC_OUT(A/B) pins be used to branch off the audio signal for a headphone output for example?

See the below graphics wich illustrates my question.

Thanks in advance!

Kind regards,
Julien

  • Julien,

    Andy will get back to you shortly.

    Regards,

    -Adam
  • Thanks Adam.
    Meanwhile, do you know if Andy got a chance to look into this?

    Kind regards,
    Julien
  • Hi Julien,

    See my comments below.

    1. Is it possible to branch off analog audio from the DAC_OUT pin?  For example: to use as a headphone output?

    Andy:  Yes. It is possible.  I would suggest you do something like the picture below. 

    2. In case (1) is possible, and no amplified audio output is needed, the PCM5122 seems a better choice for such a situation. And since the same Hybridflow can be used in both, the software implementation stays exactly the same to get exactly the same sound out of both.

    Andy:  In the case, I would also suggest you use PCM5122 instead of TAS5756M.

    Andy

  • Thanks for your answer.

    1. I understand, but in the case you pictured, one channel is lost. Do I understand this correctly?
    Assume the above is DAC_OUT_A and SPK_IN_A, then SPK_OUT_A is the amplified output,
    Below is DAC_OUT_B, which is used as a line out. SPK_IN_B is not used and thus SPK_OUT_B is also not used. So in the setup you pictured there is a mono amplified output and a mono line out.

    Is is not possible to really split/branch off from DAC_OUT_A/B in order to get stereo amplified output and stereo line out; like shown here:

    Kind regards,
    Julien

  • Hi Julien,

    It might be possible. Please note that it is not the recommended use of TAS5756M. We cannot grantee it can meet all your requirements in this kind of use case.

    Andy
  • Thank you Andy.

    I asked this question just to scan the limits of what's possible with the TAS5756M device. If we ever plan to use it this way, we will first test it on an isolated prototype off course. In that case I'll post the outcome here on the forum.

    Thank you for the information,
    Julien
  • Hi Julien,
    Could you please help to close this question if it's anwered? Thank you!