ADS1220: is it possible to connect 2 pcs 3-Wire PT100 in one ADS1220

Hi Leon,

For a 3-wire RTD measurement you would typically use all of the analog inputs in a single ADS1220 device, so only one RTD can be measured per ADC (you can read more about RTD configurations in the following app note: A Basic Guide to RTD Measurements (Rev. A)). 

The recommendation would be to use a separate ADC for every 3-wire PT-100 RTD.

Another potential solution would be to use a higher input channel count device or use an external MUX Infront of the ADC to interface different RTDs, but still only one RTD would be measured at a time with this approach.

Best Regards,

Angel