ADAU1978 Digital DC high-pass filter

Hi Bar,

I moved your thread to SigmaDSP Processors and SigmaStudio Development Tool community. Someone here may be able to help you.

Regards,

Meriam

Thank you

Hello Bar,

They both do almost the same function which is to remove the DC offset in the ADC. Which one you use will depend on your application. For most audio applications the HPF is the best way to use the part. The cutoff frequency is around 1Hz. So it will remove the DC offset so it is not a problem with any filtering or other DSP processing.

If your application requires that the ADC also passes DC then you cannot use the HPF and you would calibrate the DC offset so that the ADC will still pass DC but the offset will be small.

Dave T

Thank you Dave for your answer, it is very helpful.