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PCM1681: PCM1681 second order filter circuit on VOUTx

Part Number: PCM1681

Hi team,

I wondering how to calculate the components’ parameter of the second-order filter circuit on the VOUTx? Could you share any doc/materials regarding to this?

 

 

 

Thank you.

  • Hi, Fery,

    This filter is basically a second-order  low-pass filter biased to the Vcom level used to provide sufficient out-of-band noise rejection. This filter can be easily designed with tools like WEBENCH® Filter Designer. The Vcom output is buffered with a voltage follower for biasing purposes. We recommend to follow the suggested values from the device datasheet.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer