Very very serious problems with AIC3106 on OMAP-L137

Dear All,

I have some serious problems with Audio codec AIC3106 on OMAP-L137 board.I want to handle the codec in ARM. I fed the codec with a clean sinusoid wave and play it on output. I used "arecord" and "aplay" functions. I have three problems:

1. The output is so noisy. The SNR is less than 50 db !!!! wow. It is so disappointing.The codec datasheet claims that its SNR is 90db. By the way, I read the codec registers. They say "all things are ok"

2. The output level is very low. I changed the setting by "amixer" function and I was successful in heightening it to 2 volts (pick to pick). How can I restore the output to 3.3 volts?

3.The codec claims that it supports 32 and 24 bit format. However, when I set the format to 24-bit the data is not really 24-bit. It seems to be 16-bit. I tested it.

We have three OMAP-L137 boards. All of them have the following problems.

I would be very thankful if someone can help me.

Thanks alot