TLV320AIC3101 some input not used how to handle them

user4973896

IN my design，I only used two single end input AUDIO1-IN and AUDIO2-IN to MIC1LP/LINE1LP and MIC1RP/LINE1RP ,how should i handle the other input and output in，for example ‘MIC2L/LINE2L/MICDET ---MIC2R/LINE2R--- LEFT_LO+--LEFT_LO- ---RIGHT_LO+---RIGHT_LO-HPLOUT---HPLCOM----HPROUT--HPRCOM. ? Can you reply to me today?

over 8 years ago

0 Diego Melendez over 8 years ago

TI__Guru 57800 points

Hi,

Unused inputs can be AC-coupled to GND with a 0.47µF cap, using a 0.1µF cap would be fine as well. Analog outputs can be left floating.

Best Regards,

-Diego Meléndez López
Audio Applications Engineer

0 user4973896 over 8 years ago in reply to Diego Melendez

Expert 1555 points

What about MICBIAS pin，float or AC-coupled to GND？ if the input MIC2L or MIC2R i design like the above pic，does it will induce the noise in？

0 Diego Melendez over 8 years ago in reply to user4973896

TI__Guru 57800 points

Hi,

For MICBIAS, you can AC couple it to GND or leave it floating if it is not used. There should be no noise inducted from MIC2x as long as the inputs are disconnected form the input PGA of the ADC.

Best Regards,

-Diego Meléndez López
Audio Applications Engineer

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TLV320AIC3101 some input not used how to handle them