I have passive sensors (pyranometers that consist of thermopiles and measure sun irradiation, sensor specs are attached at the bottom of this question) that output a low voltage signal so I need to amplify them using an instrumentation amplifier.
My passive sensor has only two wires, one named HI and one named LO. I'm attaching the sensor differentially to the instrumentation amplifier.
I have chosen the AD8237 for this task: Datasheet
The datasheet of this In-Amp says:
When the source, such as a thermocouple, cannot provide a return
current path, create one, as shown in the following figure.
Can I just add a 10 MOhm resistor for each of the two inputs in parallel to ground to provide the required bias current return path like I did in the following?
Are there disadvantages to this approach? I still will be able to measure fully differential I guess as im applying the same resistor to both paths?
Any potential problems regarding impedance matching possible here?
The sensor specs: