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Linux/TLV320AIC3105: In correct voltage sensed during Record

Part Number: TLV320AIC3105

Tool/software: Linux

HI 

We are using TI codec TLV320AIC3105 for our custom board. I am using tlv320aic3x.c TI codec driver.
Trying to sense voltage during Record.
>> When there is no signal, there is DC shift getting some PCM values, whci is not even close to 0. So why this shift is getting added?
>> When it is probed shift was arround 1.36V even though our supply voltage is 3.3V. Is this expected?
>> When we are using input voltage of 200mv from signal generator as input to codec, voltage sensed at the output during record is 80mv(+ve half) and -80mv(-ve half). Why we are seeing a loss of 40mv.?

Thanks in advance.

Waiting for your response.

Jaya