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PCM5102: DAC gives no output

Prodigy 170 points

Replies: 4

Views: 2130

Part Number: PCM5102

Hello everyone!

I'm trying to interface the DAC to an WM8805 interface but I'm not getting any DAC audio output which leaves me a bit puzzled...

Here is the schematic:

Other info:

The XSMT pin is driven from an Atmega328 (not on the schematic, it's also powered by a different regulator) and gets pulled high whenever the WM8805 locks to an incoming signal (the WM appears to have a solid lock and therefore shouldn't cause any trouble). I also tried varying the rising edge speed (by adding a capacitor to ground) without any succes...

All measurements seem to be correct (when measured directly at the pin, to rule out soldering errors). The I2S waveforms look good and the charge pump is giving a -3.3V output (plus the capp/m pins have a square waveform, this means that the I2S data is read properly, right?)

I also tried replacing the IC (twice) but all chips give the same response. I couldn't find any other soldering issues or whatsoever...

Could anyone maybe have suggestion as to why this might not work?

Thanks in advance!

  • Hi Niek ten Brinke,

    You mentioned that your receiver has a lock, but can you confirm that there is data coming to the PCM5102A? Could you try confirming the data on the WM_DATA line with a scope or logic analyzer? Seeing as the charge pump is working, I suspect that the SCK pin is working as well.


    Thanks!
    Paul
  • In reply to Paul_Frost:

    Any updates?
  • In reply to Paul_Frost:

    Hello, Paul! Thank you for your reply and sorry for my delayed response! I did check whether a data signal was present, which was the case, but I didn't check its validity.

    ATM, I'm not in the office, I will get back to you as soon as I can perform some more detailed measurements! Thanks again!

  • In reply to Niek ten Brinke:

    Sorry for responding so late! It appeared that the issue was with the receiver after all! It was constantly locking and unlocking, so it never actually outputted useful data for the DAC! :)

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