AMC1305M25: Would the AVDD power noise affect the AMC1305 accuracy?

Hi team,

         My customer would like to know if the AVDD power noise affect the AMC1305 accuracy. They used UA7805 to provide the 5V to AMC1305 AVDD. When motor excitation, they found AMC1305 accuracy go down, only 10bit ENB. We guess the noise from power and affect the AMC1305 accuracy when motor excitation.

Do you have any suggestions?

Thanks!