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TLV320AIC3204: can the connection of IN1L/IN1R and HPL/HPR be broken up?

Yuan Tan63
Expert 3280 points
Part Number: TLV320AIC3204


Hi,

the customer used two groups of input, set IN1 as MiclN, IN3 as LineIN.

when switch to IN3 and set input of IN1 as Mute, blow to Mic, there is a sound at HPL/HPR.

why it happens?

the configuration is as below:

  • 0
    TI__Guru 57800 points

    Hi, Yuan,

    This situation is unexpected, once the connection with the IN1 is disabled there should be no audio from IN1 to the headphone output. The only situation where this is possible is if the input signal of the mic is exceeding the recommended input levels of the device, causing saturation on the ADC. Do you have any capture or more information about the sound that can be heard once the IN1 is disconnected?. Apart from the registers shown in the picture, are you configuring anything else when switching the output?.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer