Hi,
Good Day. I have a customer who is working with TLV320AIC3204:. Please see below the query of our customer for your reference.
My questions/concerns are with the AIC3204. I purchased 100 boards with this component on them last year and they met my performance expectations. This year, I re-ordered that same board, using that same part, 500 hundred of them. Each of the boards have noise and distortion coming from the AIC3204. In the debugging of this issue, we removed the AIC from last years board and this years board, placed last years AIC part on this years board and the noise and distortion went away. Because of this, we are quite confident that the issue is with the AICs on our new boards. (possible bad part) I was wondering if you could tell me about the differences between the old part and the new part
Old:
AIC
3204
TI 871
AZY4 G4
New:
AIC
3204
TI 291
C330 G4
The '0' in the C330 could be a 'Q'. It is hard to read. So it might be C33Q.
We've run FFTs to verify the noise floor throughout the pass band and there are spikes of unwanted frequencies in these measurements. It isn't necessarily a noise floor issue as much as it is a cross talk issue. The left and right output channels are coupling internal to the chips. We eliminated the problem in our circuit by simply replacing the part. We have 500 of these new boards that use this new version of the chip. All with the same issue. When we place the older chip on the newer boards, the problems go away. I'd like to know the difference between the two chips given the codes I've provided please. How do you characterize noise that is not harmonic distortion? We are seeing elevated noise at lower frequencies (500-6000Hz) when we drive higher frequencies at higher levels ( e.g., 0.1 Vrms at 16 kHz into a 40 ohm load.
Best Regards,
Ray Vincent
