I am searching for a method for multiplexing 3 DC voltage sources (each ±10V p-p) to my ADC pre-amplifier circuit.
My requirement is that the multiplexer should not inject excessive noise into the readings. It should be as noise free as possible, like 1 µV peak to peak max.
I'm considering building my multiplexer with switches or relays. For switch ADG1401 looks promising (however, in the data sheet I couldn't find noise related data)
Can a relay be more noise free? Do you have advice about other solutions for this requirement?
Best Answer
A relay is your right choice unfortunately (because they wear out and are noisy). I know for a fact that systems that use SQUID magnetometers use relays simply because of low electrical noise. We used reed relays for the low parasitics and good signal flow.