I have met a problem that, when the input signal to ADAU1701 is muted, ADAU1701 will output a strange cracking noise. It works fine and no any issue when normal playing. And I have tried to monitor the input and output signal, can confirm that the noise is from 1701. And one point that, this cracking noise might happen more frequently when the system temperature is high, not so high, about 60 C degree.
The following the system diagram, and input/output are I2S. System frequency is set to 192KHz, input and output frequency is 176.4KHz.
And this is the circuit on our board
the recorded cracking noise
updated noise file
[edited by: zpl at 6:38 AM (GMT -4) on 1 Apr 2021]