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TLV320AIC3204: TLV320AIC3204 common mode changes to 0V after long time

Part Number: TLV320AIC3204

Hi Team,

The common mode control register is set to 0.9V, TLV320AIC3204 works normally. However, when there is no signal in IN2L/IN2R pins for long time such as 2 hours, it's found that TLV320AIC3204 IN2L/IN2R common mode changes to 0V, so it cannot works well. Could you please help tell the possible reasons? Thanks!

Best Regards!

Hao