TLV320AIC3268 with PurePath for Anti-Pop / Clipping

Phil Hale

Guys,

Can you suggest a good way to eliminate the popping that might occur when a microphone is connected and disconnected?

I am using PurePath to introduce a DRC2 and/or Fast Limiter to prevent this popping. It is certainly possible that we do not have the setting correct as I am new to the use of the DRC2 and Fast Limiter.

Can you recommend settings to limit these types of pops? Also, we get the same kinds of popping when we say the word "Popping" loudly. It would be nice to attenuate these noises instead of letting the high amplitude to hit the gain stage and the speakers take a beating.

Any suggestions?

Thanks.

Phil

over 7 years ago

0 Luis Fernando Rodriguez S. over 7 years ago

TI__Guru* 84915 points

Hi, Phil,

There are several ways to reduce pop and they also works for noise reduction at microphone inputs. First, we suggest to separate the bias resistor into a RCR filter. For example, if bias resistor is 1k, it can be separated in two 0.5k resistors and you may place a 22uF capacitor to GND between both resistors.

In general, it is a good idea to have footprints for capacitors in may places as possible, space permitting. This will allow to see differences in unexpected pop and noise into the design.

Best regards,
Luis Fernando Rodríguez S.

0 Phil Hale over 7 years ago in reply to Luis Fernando Rodriguez S.

Intellectual 630 points

Thank you, Luis.

We tried this and it helped but we still have the pop. We might need to play with the values in order to reduce that inrush.

Thank you!

0 Luis Fernando Rodriguez S. over 7 years ago in reply to Phil Hale

TI__Guru* 84915 points

Hi, Phil,

Could you provide the AIC3268 schematic and your PurePath process flow to have a better approach to this issue?

Thank you!

Best regards,
Luis Fernando Rodríguez S.

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TLV320AIC3268 with PurePath for Anti-Pop / Clipping