MUX509: There is crosstalk between channels

Hi zhang,

The schematic for the MUX509 looks correct however we might need some more info here to figure out the issue.

1.What is the yellow and green line.( what pins of the device are the connected to?)

2.What frequency are the signals being put through the mux? are they DC or AC?

If this is a DC signal application there might be some problem between the relationship of the  off resistance or leakage  multiplexer and input impedance of the op amp.

Please let me know if you can provide any more info and I am happy to help here.

Regards,

Kameron