In my project, The chip is ADAU1467 and AD1938, AD1938 matched with some hardware circuit to realize DA and AD function. the detailed circuit shows in the figure. There are some capacity to filter the DC signal, so that the DC signal can not been feed into the ADC. Can you give me some suggestions? my purpose is that the DC signal generated by arbitrary waveform generator can been read by DSP and show in the readback function. I am looking forware your reply. Thank you.