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Hi,
I need to acquire several 4-20mA signals, coming from different sensors. My idea is to use several multiplexers (I'm considering to use TMUX1208) in order to bring 4-20mA signals to an ADC.
Sensors are not supplied by the current loop and 4-20mA signals will share the same ground of multiplexers and MCU.
My first hypothesis (option 1) was to use the following topology, that is 4-20mA signals are converted to voltage before arriving to the multiplexer:
I was wondering if it is indeed possibile (option 2) to take 4-20mA current signals through the multiplexer, and only next do the voltage conversion of all current signals (one at a time) with a single resistor, like in the following image:
Is it feasible to use the second option, that is multiplex current signals by using TMUX1208?
Thank you for your attention.
Best regards.
