JAJSGG2C October 2018 – June 2019 ADS125H02
The low noise and low drift performance, 50-Hz and 60-Hz noise rejection, and high common-mode voltage range of the ADS125H02 make the device suitable for multiple thermocouple inputs that have varying levels of common-mode voltage. The common-mode voltage can be AC (50-Hz or 60-Hz noise pickup) or DC caused by varying ground potentials encountered in industrial machinery. Figure 100 shows a simplified application of an 8-input, isolated ground, thermocouple module using an external 8:1 differential input multiplexer. The GPIO of the ADS125H02 drives the mux select pins.