Answer: Yes, that should work and the number of AIN pins per sensors is minimized. However, sharing pins will add error to the overall conversion as there will be a voltage drop across the R of the RC anti-aliasing filter/EMC filtering which in series with the RTD, thus limited R values can be used. It is recommended for EMC/anti-aliasing optimum performance; it is a good practice to enable IOUT on a dedicated pin and applied to the RTD outside of the AIN input filters. In this case, only leakage current goes through the R value of the external filter so the impact of the R value on overall accuracy is minimize. This implementation uses one extra AIN pin versus the shared implementation.