I have been using AD2S1210 evaluation board with TI F28379D launchpad and control card. The default Excitation gains are 1.54 and 0.866 on 7.2 V peak to peak signal provided by the chip. I changed the gain to 2.74 by soldering 27.4 kOhm resistor at R10, R19, R30 and R39 and I can get 7Vrms as the excitation signal. My resolver has a transformer ratio of 0.5. So to reduce the amplitude of sine and cosine outputs I created a voltage divider using R22, R24 (Cosine) and R21, R26 (Sine). I used 28.7 kOhms for R22,R21 and 71.5 kOhms for R24,R26. The sine and cosine voltages are reduced to about 3V peak to peak from 3.5Vrms.
I still see Sin/Cos clipping faults while using it with the EVAL-SDP-CB1Z. Can you please help me understand, what causes this fault and how can I mitigate it?