TLV320AIC3104: Noise of differential input configuraion

Kuramochi Tadahiko

Guru 28715 points

Part Number: TLV320AIC3104

Aaron Estrada

Hi,

When the AIC3104 is configured in differential input mode, the noise can be heard.

(Please increase volume level when hearing noise)

This noise can be heard even if the input channnel is connected with GND via a capacitor and this can not be heard in single-ended mode.

What is this noise caused by?

I have already sent the schematic to Aaron-san,

Best Regards,

Kuramochi

over 4 years ago

0 Kuramochi Tadahiko over 4 years ago

Guru 28715 points

How is this situation?

Best Regards,

Kuramochi

0 Aaron Estrada over 4 years ago in reply to Kuramochi Tadahiko

TI__Mastermind 22950 points

Hi Kuramochi-san,

There are several threads that seem to be related. Is it okay to work on one common thread? It can be confusing when working with different threads and the same device configuration/schematic.

Regards,

Aaron Estrada

0 Kuramochi Tadahiko over 4 years ago in reply to Aaron Estrada

Guru 28715 points

Hi Aaron-san,

I would like to divide the thread by question because I can confuse in the case of multiple topics in one thread.

Best Regards,

Kuramochi

0 Aaron Estrada over 4 years ago in reply to Kuramochi Tadahiko

TI__Mastermind 22950 points

Kuramochi-san,

Understood. For the noise, is it possible to perform an FFT to see the noise floor of the CODEC?

Regards,

Aaron Estrada

0 Kuramochi Tadahiko over 4 years ago in reply to Aaron Estrada

Guru 28715 points

Hi Aaron-san,

My customer is confirming above.

Can you hear the same noise on the EVM?

Best Regards,

Kuramochi

0 Aaron Estrada over 4 years ago in reply to Kuramochi Tadahiko

TI__Mastermind 22950 points

Hello Kuramochi-san,

Not with 0dB PGA gain. An FFT to check the noise floor would really help.

Regards,

Aaron Estrada

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TLV320AIC3104: Noise of differential input configuraion