Differential input for ADAU1701 ADC

Discussion created by U.E. on Apr 15, 2017
Latest reply on May 13, 2017 by KJBob

Hello to all ADAU1701 fans,


I would like to share a very simple circuit for expanding the standard audio ADC input

to a fully differential input path. It works very well and rises the SNR (in my hardware)

to 102dBA.

You have to select a low noise OpAmp with RRO for best performance. PLS note that

the full scale input is R1 * 100uA (eff). The buildtin ADCX-resistor must not be taken

into account.


Best regards