SGTL5000 : pop when switch Mic -> Line-in

[victorien]

Hi,

I'm developping a new board with a SGTL5000 audio codec and I have an issue that I can't resolve.

When I switch input from Microphone to Line-in, there is a pop on audio signal. I see this pop on I2S data and it's look to be generate in the ADC (input or output).

Is there someone who know this issue and find a solution ?

Regards

[reyes]

Hi,

The first recommendation would be to set the “SMALL_POP” bit in CHIP_REF_CTRL 0x0028, setting this bit slows down the VAG ramp from ~200 to ~400 ms to reduce the startup pop, but increases the turn on/off time.

Another recommendation would be to mute the outputs during the switch between Mic and Line-in to avoid any pops/clicks, the outputs should remain muted during these chip configuration steps.

Have a great day,
Jose

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[victorien]

Hi,

I tested this both solutions but they don't eliminate the pop