AJ9520

ADAU1961 high frequency noise issue

Discussion created by AJ9520 on Apr 12, 2016
Latest reply on Apr 21, 2016 by AJ9520

Hi Sir.

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.

 

http://pan.baidu.com/s/1o7BhdUE

 

ADAU1961 schematic.jpg

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