Thanks for the reply, Kung. For our application, the AC coupling for analog input does not work well. Our signal range does vary from 1.1V to 2.1V by considering the driven by 50 OHM and the AFE internally driven by 5K OHM. From the Figure 31 you mentioned, the Two Switches indicated "AC coupling" should be ON in order to sample DC analog input. Is this switch configured by the General-Purpose Register 21[0], 33[0] or 7[1]? What's the default values of the GPR values? Should I configure all the GPR values after powering up? Best, Xiuyan
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