SBAU206B april 2015 – may 2023 ADS1262 , ADS1263
Connect the two measurement leads of a 4-wire RTD to any of the following differential pairs on terminal block J3: AIN0 and AIN1, AIN2 and AIN3, or AIN6 and AIN7. Connect the remaining common leads to AIN4 and AINCOM. Figure 3-9 shows an example where the 4-wire RTD is connected to differential pair AIN6 and AIN7.
In this configuration, no external jumper wires are necessary. IDAC current flows across the RTD and then through R1. The ratiometric reference voltage is generated between AIN4 and AIN5. The IDAC current is then routed to GND through resistor R2 when populated.