Texas Instruments ADS1263EVM-PDK User Manual page 13

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3.1.2.4.3 Connecting a 4-Wire RTD
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.
J3
4-wire
RTD
J4
J5
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.
SBAU206B – APRIL 2015 – REVISED MAY 2023
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AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
AIN8
AIN9
R1
AINCOM
REFOUT
Figure 3-9. 4-Wire RTD Ratiometric Connection Example
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ADS1263EVM
AVDD
AINCOM
AIN7
AIN6
AIN3
Mux
AIN4
AIN5
R2
Analog Interface
ADS1263
IDAC1
PGA ADC
IDAC2
ADS1263EVM-PDK Evaluation Module 13