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

over 6 years ago

0 Collin Wells over 6 years ago

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 Mason Liu over 6 years ago 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 Collin Wells over 6 years ago 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 Mason Liu over 6 years ago in reply to Collin Wells

TI__Expert 4035 points

Hi Collin,

Thanks a lot for helping me.

Best regards

Mason

Audio

Audio forum

PCM1863: PCM1863 accuracy bits