Texas Instruments ADS1x48EVM, User Manual, Page: 27 / 48

3.5.4 Connecting a General-Purpose Input to J5 on the ADS1x48EVM
Although the ADS1x48EVM is designed for measuring all types of analog temperature sensors, general-purpose
input signals can be applied to the ADS1x48 through the TC± inputs on the J5 terminal block.
Figure 3-21 shows
the input structure used for the TC± inputs.
10.0M
R24
DNP
AVDD
10.0M
R23
DNP
4.12k
R16
4.12k
R13
0.01uF
C10 1000pF
C3
1000pF
C4
1
2
3
4
5
6
J5
REFOUT
REF5025
TC+
TC-
NTC+
NTC-
TC+
TC-
AIN4
AIN5
GND
GND
Figure 3-21. Using the TC± Inputs on J5 as General-Purpose Signal Inputs
As Figure 3-21 shows, resistors R24 and R23 are not populated by default, resulting in a set of analog inputs
that are only subject to the differential filter cutoff frequency of 1.93 kHz and the common-mode filter cutoff
frequency of 38.63 kHz. The TC± inputs can therefore be used for any general input signal as long as the
ADS1x48 absolute input and common-mode range requirements are satisfied. Select the AIN4 and AIN5 inputs
on the ADS1x48 to measure a voltage connected to the TC± inputs.
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SBAU378A – SEPTEMBER 2021 – REVISED JANUARY 2022
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ADS1x48EVM Evaluation Module 27
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