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AD7147-1 capacitance sensing

these are the schematic of my capacitance sensing board and some detals. How can I isolate the influence of ADG734 to the AD7147 sensing. like, when sensing chanel 1, the OUT1 in ADG734(U5) is in High-impedence state. But I think High-impedence state is not enough. Could someone give me some advice? Thanks!