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PCM1863: PCM1863 accuracy bits

Mason Liu
Expert 4035 points
Part Number: PCM1863

Hi,

in PCM1863 datasheet, i only find secondary ADC accuracy:12 bits,

i don't know why there is no primary ADC accuracy? only PGA+ADC? 

Thanks.

Best regards

Mason

  • 0
    TI__Guru 63205 points

    Hello,

    The accuracy of the primary ADC + PGA are specified in terms of their audio performance in SNR and THD+N in dB.

    The specification you're specifically referencing is actually the gain accuracy of the PGA+ADC.  There is a typical 0.5dB gain error in the PGA+ADC gain accuracy when changing the gain between the -12dB - 32dB options.

  • 0 in reply to Collin Wells
    TI__Expert 4035 points

    Hi Collin,

    So can i understand it as PCM1863 ADC is not shown is bits, but in dB, the dB is ADC + PGA gain?

    Thanks.

    Best regards

    Mason

  • 0 in reply to Mason Liu
    TI__Guru 63205 points

    Mason,

    Audio ADC performance is typically defined by two performance specifications:  SNR and THD+N.  These specifications are listed in the datasheet image that I copied before.

    The gain accuracy is specified as 0.5dB which means that when you select a particular gain setting, the actual gain will be at the desired level +/-0.5dB.

  • 0 in reply to Collin Wells
    TI__Expert 4035 points

    Hi Collin,

    Thanks a lot for helping me.

    Best regards

    Mason