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Original question:

PCM2912A noise problem

PCM2912A: Background noise is high

Gabriel Wang1
Genius 5005 points

Part Number: PCM2912A

Dear Expert

We use Win10 system ,20dB Gain ,internal bias voltage.

Now we found that In the condition of no microphone for recording, that is, the background noise of the board is relatively large.

Below is our schemetic ,pls check and give any advice that is very greatful.

  • 0
    TI__Mastermind 23030 points

    Hello,

    Can you please elaborate what you mean by No mic? Are you physically disconnecting the mic? if so i would suggest to connect a 4.7uf capacitor to GND in the place of the Mic and evaluate the noise.

    You could also compare the noise on your board with an EVM. 

    When you say no