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pic33f4011 unlock successful

With disPIC33F, the amplitude of the input AC signal is relatively large. When the time is significant, there is nearly 8V, and the working voltage of AD is 3.3V. When the input AC signal amplitude is higher than 4V, the AD signal of this channel will interfere and affect the other AD signals. I ask how to match the AD input circuit to solve the problem of interference to other road signals when the input signal amplitude cannot reduce.
Is it feasible to add a limiter directly to the AD input?