TLV320AIC3204: Audio out noise

Hi Jack,

Could you clarify more on the issue you are seeing? Is the scope showing the GPIO_Audio signal that is circled in the schematic? What are the different operating conditions between the two scope shots?

Best,

Garret

The first image shows a normal waveform from the CPU to the TLV320AIC3204.
The second image shows a rippled waveform from the CPU to the TLV320AIC3204,which is the cause of the noise.
Circled test points in the circuit diagram.

Hi Jack,

If this is an ASI signal, you can add a small resistance on these lines 22-100Ω. I am still not sure of the exact issue you are seeing.

What signal is shown in the scope? I only see one wave, but you circled six ASI signals in the schematic.

What introduces the ripple in the signal?

Can you show the effect on the output? Which output are you seeing the noise?

Please be as detailed as possible, as it will make it easier to help solve your issue.

Also, you should add pull-up resistors on the I2C lines if there are not already.

Best,

Garret

Hi Jack,

Please let me know if you are still having issues, otherwise I will close this thread.

Best,

Garret

Currently, we are investigating whether it is related to software.