Hi everyone,
I've been using the TLV320AIC3254 with 2 differential mic inputs (Left = IN2L - IN2R and Right = IN1R - IN1L) for 2+ years and it worked well upto now.
The two omnidirectional mics help for some treatment and are finally summed to the output.
However, my last production came up with a weird inverted input (left) ! Making my mics behave as a bidirectional sensor after summing !
The PCB's are stricktly identical and the program of the PIC which configures the codec on power-up is also the same...
Here I have 2 identical boards with the same program, but they do not behave de same. Then I have to put a software -1 coef on the left channel of the last production if I want it to work as the first ones.
Where do you think it comes from ? Even the last datasheet update doesn't state anything about this...
Do you have an idea to identify the boards which need -1 within those which doesn't. ?