PCM2912A pop noise

Hi Nat,

There is an application note that could be useful on this. Take a look at section 8 of the following document:

Application_Note_USB_090513.pdf
I hope this helps.

Best regards,
-Ivan Salazar
Texas Instruments

Dear Ivan

Thank you for your suggestion.

I will study it.

BRS

Nat

Dear Ivan

I have used the following circuit.

But POP noise is still happening.

1.Does PCM2912A provide mute function for HP?

2.Do you have any suggestion? Thanks

BRS

Nat

Hi Nat,

Mute function for playback path (headphone) is possible through volume/mute controls in the host system audio controls.
You could try to use a mute circuitry at the output triggered by loss of data on the USB port. Although there is not a suggested way to implement this kind of circuitry,

Best regards,
-Ivan Salazar
Texas Instruments

Dear Ivan

Thank you for your suggestion.

I also see the pop noise at EVM board(www.ti.com/.../dem-pcm2912aevm).

Could you suggest a mute circuitry to let me follow (at the output triggered by loss of data on the USB port)?

Thanks

BRS

Nat

Hi Nat,

We haven't performed a mute circuitry like this. Let me do some research on this.

Best regards,
-Ivan Salazar
Texas Instruments

Dear Ivan
Do you have any information for mute circuit?
Thanks
BRS
Nat

Hi Nat,

Unfortunately I can't find detailed information about this mute circuitry.
This is a suggestion from a previous post: e2e.ti.com/.../613982
I tried to find detailed information about it but it seems that it is not available.

Best regards,
-Ivan Salazar
Texas Instruments