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reducing feedback voltage for AD2S1210


I am using 24V excitation, and Sine and Cosine voltages are 4.8vp-p. Considering that the maximum voltage of these pins is 4V for AD2S1210, I need to scale that. I was wondering what is input stage of these pins? is it gain with fully differential opamp? if so I can add series resistors to these pins if I know the internal resistors to change the internal gain. Could anybody has any information on the internal circuit of sine and cosine pins?

Another solution is external gain. I was wondering how much is the maximum allowed voltage and Sine and Cosine pins related to GND. I did not find it in the datasheet, I would be grateful if someone share this information with me.

Thank you