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PCM4222: Some question

Walsh
Intellectual 950 points
Part Number: PCM4222

Hi,

I made a demo board which used PCM4222PFB to sample signal, but I found some questions as follow, when I tested the board.

Firstly, I wanted to test the performance. The board was powered by battery. A small dc signal was added into XLR input, but the PCM output data was unstable, about low 10 Significant Bits were changing(the total bits is 24). Then I tested other demo board, which had the same problem. I’m not clear what cause it and how to solve this program. Can you give me some tips?

Secondly, The PCM output data of PCM4222PFB contains noise of input signal .it also carries the noise of the circuit, so how to separate the noise of the circuit. Can you give me some tips?

 

Schematic is as below,


 




Thanks,

Walsh