TLV320AIC3104-Q1: output analog signal will automatically decrease

Hi Sam,

can you provide more details?

1.Which output are you using?
2. is the signal coming from the DAC, or the PGA?
3.What is the load?
4.how much attenuation are you seeing?
5. what is the length of time it takes to decrease?

this is not normal behavior, so it would be good to get a better picture of your test setup.

best regards,
-Steve Wilson

input

Hi Steve,

Thanks for you reply.

2. PGA gain 0db, AGC disabled

3. Use PA tester for load

4.Input 650Vrms, output in the first two seconds is 750~800Vrms, two seconds after the output instant attenuation to about 200Vrms(swaying between 175~260). The input is a sine wave of 1KHz

Sam,

1. Are you running the codec as the I2S Master?
2. You should not have a capacitor on micbias. if you are not using it, leave it floating.

3. Please provide your codec configuration

-Steve Wilson