AnsweredAssumed Answered

strange pop using sgtl5000

Question asked by ieio on Mar 20, 2014

Hi I am using sgtl5000 on a, imx6 based custom board, and  its alsa driver included in LTIB.

Randomly I hear a pop after I played a WAV, doesn't matter if I play it using aplay or my application.

I always keep Bias ON (echo 1 >/sys/devices/platform/soc-audio.1/HiFi/bias_always_on) to avoid any potential noise due to some mistakes in setting the bits in the CHIP_ANA_POWER register in the right sequence.sgtl5000.jpeg.jpg

As you can see from the image, on LINEOUT there is a negative spike (the pop I hear) after the tone I play.

As I said this spike is apparently random, most of the time the signal is correct and sound clean.

Anyone has some clues about the cause of this behavior?

 

Thanks in advance,

i.

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