Texas Instruments ADS1x48EVM, User Manual, Page: 12 / 48

3.5 Analog Input Connections
The ADS1x48EVM is designed for easy interface to external temperature sensors using the two screw terminal
blocks (J5 and J6). Connector J5 provides connections for thermocouples and thermistors as well as the 2.048-V
output voltage from the ADS1x48 integrated reference and the dedicated 2.5-V output from the REF5025.
Connector J6 includes a pair of differential reference inputs for connecting an external voltage reference source
to the ADC as well as three dedicated terminals for connecting a 2-, 3-, or 4-wire RTD.
Table 3-3 summarizes
the channel input connections for J5 and J6. Both connectors are clearly labeled on the PCB silkscreen for easy
input connection identification. Figure 3-6 shows the input layout.
Table 3-3. ADS1x48EVM Terminal Block Input Description (J5 and J6)
Terminal Block Input Label Description
J5:1 TC+ Positive thermocouple, general-purpose input
J5:2 TC– Negative thermocouple, general-purpose input
J5:3 REF5025 2.5-V output from REF5025
J5:4 REFOUT 2.048-V output from ADS1x48 integrated VREF
J5:5 NTC+ Positive thermistor input
J5:6 NTC– Negative thermistor input
J6:1 REFP1 Positive external VREF input to ADC
J6:2 REFN1 Negative external VREF input to ADC
J6:3 RTD_A RTD connection point A
J6:4 RTD_B RTD connection point B
J6:5 RTD_C RTD connection point C
J6:6 GND Analog ground
Figure 3-6. ADS1x48EVM Analog Input Terminal Blocks (J5, Left; J6, Right)
The following sections describe how to connect each different analog temperature sensor to its respective
connector, beginning with terminal block J5.
ADS1x48EVM Overview www.ti.com
12 ADS1x48EVM Evaluation Module SBAU378A – SEPTEMBER 2021 – REVISED JANUARY 2022
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