Texas Instruments ADS1x48EVM, User Manual, Page: 19 / 48

3.5.3.1 Connecting a 2-Wire RTD Using a Low-Side R
REF
to J6 on the ADS1x48EVM
Figure 3-13 shows how to connect a 2-wire RTD using a low-side R
REF
configuration to J6.
AIN1
REFP1
REFN1
AIN0
REFP1
REFN1
R
T
D
RTD_A
RTD_B
RTD_C
IEXC1
AIN3
AIN2
JP3
JP4
JP5
IEXC2 IEXC2
IDA C
JP6
Figure 3-13. Connection Diagram for a 2-Wire RTD Using a Low-Side R
REF
Figure 3-13 also shows that for this RTD configuration, the RTD is connected to REFP1 and RTD_B.
Additionally, jumpers JP3 and JP4 are connected whereas jumpers JP5 and JP6 are disconnected. Finally, the
IEXC1 current source is enabled and the measurement is taken between AIN3 and AIN1.
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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ADS1x48EVM Evaluation Module 19
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