Hi, ADI Support Team
I am currently investigating the difference in noise levels at output between the analog and digital inputs of the ADAU1401A.
When mute (No Slew) is executed during analog input, POP noise occurs.
On the other hand, when mute (No Slew) is executed during digital input, POP noise does not occur.
For the purpose of this investigation, a silent source is used for the analog input.
With a normal music source, the POP noise is not noticeable, but with a silent source, it is clearly audible.
Furthermore, as an additional investigation, I have removed as much noise components as possible from the analog input source, but POP noise is still detected.
Does this mean that the conversion noise in the ADC is dominant over the noise of the analog input source?
Is this the performance limit of the built-in ADC of the ADAU1401A?
Ultimately, I intend to use mute (with Slew) to avoid this, but I need to understand the root cause.
I would appreciate your opinion.
Best Regards, TomY