Hi,
We are using Predriver output to drive an external Class D amplifier and we are eeing pop noise at the beginning and at the end of the audio.
To debug the above Pop noise issue, we isolated the Predriv_L from Class D amplifier input and probed the Predriv_L line.
By default the Predriv_L line is low (0V). Whenever we enable Pre driver audio , It rises to 1V very sharply and comes down.
and when it is dsabled, the Predriv_L line goes to -1V sharply before it comes back to 0V.
Please find the oscilloscope captures below ( when Predriv is enabled or disabled).
Why there is a momentary signal coming onto Pre driver output whenever it is enabled? Do we have to follow any particular sequence in configuring the PMIC registers to avoid this pop up?
Thanks and regards,
Mahesh Hooli