TLV320AIC3120: Multiple Mic input for TLV320AIC3120

AMIT SHARMA2

Part Number: TLV320AIC3120

Why three MIC inputs are given in the TLV320AIC3120 ? from the block diagram one of the MIC is connected to negative input of Comparator used to fed PGA input.

over 5 years ago

0 Steve-Wilson over 5 years ago

TI__Mastermind 30030 points

AMIT,

I don't see this comparator you're talking about. there are there are selectable gain/input impedance blocks, mixers, and the PGA.

The inputs are flexible.

1. Mic1LP and Mic1LM can be used as a single Differential input by connecting MIC1LM to the negative input of the PGA.

2. all three inputs can be used simultaneously as Single ended inputs. in this case VCOM should be connected to the negative terminal of the PGA.

3. MIC1LP, Mic 1RP can bypass the ADC and be mixed with the output, while Mic 1LM can be used as a single ended input.

obviously there are variations on these, but these are the 3 main ways we see the 3 inputs used.

best regards,

-Steve Wilson

0 AMIT SHARMA2 over 5 years ago in reply to Steve-Wilson

Intellectual 470 points

thanks.

I have used MIC1Rp as input and MIC1LP and MIC1RM is not used.VCOM is programmed for negative input of PGA.

is it OK? I programmed Codec register for the selection i used.

0 Steve-Wilson over 5 years ago in reply to AMIT SHARMA2

TI__Mastermind 30030 points

Amit,

That is ok!

best regards,
-Steve Wilson

0 AMIT SHARMA2 over 5 years ago in reply to Steve-Wilson

Intellectual 470 points

Dear Steve

I am using two microphone, one of mic is permanently connected to MIC1RP input and MIC1LP input is used for jack based Headphone MIC. when i am reading register 0x2E on page 0 to headphone insertion removal detection. This gives me wrong indication.

0 Steve-Wilson over 5 years ago in reply to AMIT SHARMA2

TI__Mastermind 30030 points

Hello Amit,

Can you tell me how you've connected your Vol/HED_DET pin?

you have turned on the detection in register 67 (0x43) correct?

best regards,
-Steve Wilson

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TLV320AIC3120: Multiple Mic input for TLV320AIC3120