I am trying to use AC2101 to detect very tiny currents using integration times in the 20-second range. So I’m trying to minimize any ground currents finding their way into the signal path.
What is the purpose of the Select switch that connects input return pin another pin (output return)?
Where is the best place to connect the photodiode return (the net between cathode to COM) to ground?
Is COM A connected to GND A inside the part? Do those pins need to be connected together close to the part to prevent currents from flowing between them?