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ADAU1761 DC gain in the digital mic path

Question asked by maheshmuni Employee on Sep 23, 2016
Latest reply on Sep 29, 2016 by TylerK

Hi

 

I am working on analog devices ADAU1761 audio codec chipset.
Capturing the data through digital mic path and dump the same to a file for the further analysis purpose.
During this process, HPF (ADC High-pass filter, Register R19, address 0x4019, bit 5) is turned OFF.
Then observed a DC offset in the captured signal as shown below.

How to remove this DC offset without enabling the HPF ?
Is there a way in the ADAU1761 codec to compensate the DC offset?

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