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PCM1863EVM: 100k resistor and low-pass filter on inputs

Sebastian_0815
Prodigy 50 points
Part Number: PCM1863EVM
Other Parts Discussed in Thread: PCM1863

Hello,

what is the benefit of the 100k resistors (R40-R47) on the inputs of the adc? Is is related to [1]? Do I need them on inputs where using a low-pass filter as depicted in figure 53 of pcm1863 datasheet?

Kind regards, Sebastian

[1] https://e2e.ti.com/support/data_converters/audio_converters/w/design_notes/2810.pcm186x-unused-inputs

  • 0
    TI__Guru 57800 points

    Hi, Sebastian,

    The usage of those resistors is related to the note you provided. It is recommended for applications like the EVM where the inputs are not always connected to the PCM1863. They are also needed if the filter is used.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer