ADAU1452 TDM8 input, TDM8 output, but play 20kHz sine wave, there is pop noise in the speaker.


1. below is my system diagram

2. A2B format is TDM8, input 20kHz, and TDA7803a output pop is below

and the pop noise is periodicity,

3. Below is my sigma studio project


4. TDM8 input format is

5. If I connect TDM8 directly to TDA7803a, no pop noise

6. I connect TDM8 input signal to 1452 demo board, the output is I2S, also have pop noise

7. But our other project also use this TDM8 signal, the DSP is 21479, no this issue.

so need your help to check this,

thanks very much.