Texas Instruments ADS1x48EVM, User Manual, Page: 23 / 48

3.5.3.5 Connecting a 3-Wire RTD Using Two IDACs and a Low-Side R
REF
to J6 on the ADS1x48EVM
Figure 3-17 shows how to connect a 3-wire RTD using two IDACs and a low-side R
REF
configuration to J6.
REFP1
REFN1
AIN0
REFP1
REFN1
R
T
D
RTD_A
RTD_B
RTD_C
IEXC1
AIN3
AIN2
JP3
JP4
JP5
IEXC2 IEXC2
AIN1
IDA C
JP6
Figure 3-17. Connection Diagram for a 3-Wire RTD Using Two IDACs and a Low-Side R
REF
Figure 3-17 also shows that for this RTD configuration, the RTD is connected to REFP1, RTD_A, and RTD_B.
Additionally, jumpers JP3 and JP4 are connected whereas jumpers JP5 and JP6 are disconnected. Finally, the
IEXC1 and IEXC2 current sources are enabled and the measurement is taken between AIN3 and AIN2.
Table
3-5 summarizes the necessary connections and ADC configuration settings.
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SBAU378A – SEPTEMBER 2021 – REVISED JANUARY 2022
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