TLV320AIC34: PDM digital mic

Eric Duong

Part Number: TLV320AIC34

Hi There,

Is TLV320aic34 supports PDM digital mic thru GIPO1_x and GPIO2_x terninals? and i guess IOVDD is the high voltage level for GPIO1_x and GPIO2_x?

Thanks,

Eric

over 4 years ago

0 Collin Wells over 4 years ago

TI__Guru 62885 points

Hello Eric,

Yes, that is correct. The GPIO logic levels follow the IOVDD supply.

0 Eric Duong over 4 years ago in reply to Collin Wells

Prodigy 140 points

Hi Collin,

Thanks for quick response. So, TLV320aic34 supports PDM digital mic right? Please confirm.

Eric

0 Collin Wells over 4 years ago in reply to Eric Duong

TI__Guru 62885 points

Yes, please review Section 9.3.24 Digital Microphone Connectivity of the datasheet. The app note below also provides information about the connections:

0 Eric Duong over 4 years ago in reply to Collin Wells

Prodigy 140 points

Hi Collin,

Can unused input/output pins be left floating?

Thanks,

Eric

0 Collin Wells over 4 years ago in reply to Eric Duong

TI__Guru 62885 points

Hello,

Unused analog inputs should be AC coupled to GND through a ~0.47uF capacitor. They can be shorted together instead of having to use individual capacitors for each unused input.

Digital inputs need to be connected to VCC or GND, and should not be left floating.

Analog outputs can be left floating.

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TLV320AIC34: PDM digital mic