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Generating I2S noise when C6742 providing master clock

Omin Chou
Genius 3555 points

Hi all,

I would get I2S noise and enlarge power ripple when configured AHCLKX and AHCLKR of McASP as master clock on C6742 custom board. 

If I cut I2S signal or changed AHCLKX and AHCLKR of McASP to slave mode, the above problem would be gone.

Could anyone shed me some light here? Let me resolve this issue ASAP. Thanks in advance.

Here is my I2S clk diagram.

B.R.

OC