Dear Joachim, Thanks a lot for your quick answer. I understand the solution number 1 with 2 x ADS124S06 and the solution number 2 with one ADS124S08 plus one external 2x 1:4 MUX. (sorry I called this MUX "2:8" and it is rather "2x1:4" !) 1) But can you explain why you need two 2x1:4 MUXs in the solution 3 with one ADS1220 . In my understanding one 2x1:4 MUX is enough, because one wire of each RTD is permanently connected to RREF/RF3/REPFP0 and the 2x1:4 MUX will connect alternatively the 2 other wires of each RTD to RF1/AIN1 and RF2/AIN0. (I am referring at figure 77 of ADS1220 datasheet www.ti.com/.../ads1220.pdf) 2) At this stage I can also consider the alternative to use four J-thermocouples instead of four 3-wires RTD (temperatures to measure are in the 0-300°C range). What do you recommend as ADC model and schematic drawing in this hypothesis ? Best regards, Philippe
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