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Original question:

PCM6020-Q1: Noise Issue. Even though the input line has been removed.

PCM6020-Q1: Micbias used as external supply in AC coupling

Madhaiyan Kodi
Prodigy 50 points
Part Number: PCM6020-Q1

Tool/software:

Hi TI team,

Can we use the Mic bias supply as phantom power(8V,15mA) and Mic bias will be connected to after the AC coupling capacitor (connector pin). 

No Micbias is connected at ADC input side. Is this solution works, any issue with PCM6020 functions

  • 0
    TI__Mastermind 28400 points

    Hi Madhaiyan,

    You can use the MICBIAS supply as phantom power, but the resistors R0 in the diagram are still required in parallel. This is because the device does not generate the ADC bias point directly on the input pins, so MICBIAS is needed to provide the biasing.

    Best regards,
    Jeff McPherson