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Hello
In the application section, there are different scenarios for input signal impedance, this might help; what is the concern for the Rd of the mux?
When connected to the mux, Rd can be estimated to be 200ohms
This is not explicitly stated in the datasheet, this is a shortcoming
Within the Application section 9 of the datasheet, specifically 9.2.2 OPA192 Buffered Multiplexer output might prove helpful for your application
Regards, Cynthia