Hi,
Could you please tell us the frequency band of the power supply noise for Vcc of PCM1808?
We will modify the decoupling capacitors hearing it.
The evaluation detail is shown as below.
As a result, the DR and SNR was degraded if the same power supply is applied to OpAmp and PCM1808.
On the other hand, it is good performance if the separate power supplies are applied to them.
Therefore, we believe that this cause is the power supply noise which PCM1808 generates for Vcc, it affects OpAmp.
Best Regards,
Kato
