PCM5102A: Schematic review

Jochem van Kranenburg

Prodigy 100 points

Part Number: PCM5102A

Dear TI-experts,

I'm having a hard time getting audio out of a PCB with this schematic. Can you see something obviously wrong with it?

Best regards,

Jochem

over 1 year ago

0 Arash Loloee over 1 year ago

TI__Mastermind 30711 points

Hi Jochem , I will review it by the end of Thursday afternoon.

Regards,

Arash

+1 Arash Loloee over 1 year ago in reply to Arash Loloee

TI__Mastermind 30711 points

I don't see any error in the schematics. Few things to check;

Make sure LDO and VNEG are working correctly. check the voltage on those pins. If all supplies are reading correctly at the pins, then pay attention to your clks as usually the issue is due to clks/data line.

Please send me screen shot of scope for 3 wire I2S signals. You need to make sure it is I2S format that is getting into the device , as shown in Figure 14. I2S Audio Data Format in datasheet.

Regards,

Arash

0 Jochem van Kranenburg over 1 year ago in reply to Arash Loloee

Prodigy 100 points

Hi Arash,

Thank you so much for your swift help. We had an off the shelf breakout laying around with the same chip that worked. So it had to be our PCB. Your response made me solder a new one and closely measure the points you mentioned.

The LDOO was at 1.8V while VNEG was 0V. The charge-pump also wasn't working. Then I spotted a mistake in the PCB document (not the schematic you reviewed). CPVDD wasn't provided with 3.3V, while the schematic states it should be.

As a result, I've opened an issue over at the AutoDesk forum here.

Thanks again. Best regards,

Jochem

0 Arash Loloee over 1 year ago in reply to Jochem van Kranenburg

TI__Mastermind 30711 points

Excellent. I am glad you have it working. Thanks for letting me know.

Regards,

arash

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PCM5102A: Schematic review