We had automotive infotainment project got high frequency noise issue.
Signal Chain is AUX input => ADAU1961(Pin 6 / Pin 14) => I2S => ADAU1451 => PA.
About high frequency noise issue please listen from below website.
We try LDO power alone to ADAU1961 and removed C899 / C900 the situation is same.
We also try AUX input to GND. But no any change from noise issue.
We used SigmaStudio to turn off ADAU1961 ADC Then no any noise.
We have no idea about the problem of noise currently. Please kindly help us to Solve this problem.