Dear Xiaodong, Many thanks for your reply! Your explanation is clear, but it does not solve my question. As for the internal RC, the R is the MUX on-resistance and C is the input capacitance; this is according to the datasheet and the application notes. My point is about the effects of the on-resistance of the switch of the S&H and the ensuing holding capacitor. This is not another internal RC, but nothing is said about that, why? Best regards, Ferran
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