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PCM1864-Q1: Please review the schematic

Part Number: PCM1864-Q1

Hello TI experts,

my customer made their PCB with PCM1864-Q1. they found that there are many noise in the sound(voice) through microphone.

so it is better to review the schematic first. Could you review it?

microphone is connected to pin2/pin4, and pin1/pin3 is floating.

Please let me know if you need more information. Thanks.

Best regards,

Chase