Analog Input Connections; Figure 3-6. Ads1X48Evm Analog Input Terminal Blocks; Table 3-3. Ads1X48Evm Terminal Block Input Description (J5 And J6) - Texas Instruments ADS1x48EVM User Manual

ADS1x48EVM Overview

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.
the channel input connections for J5 and J6. Both connectors are clearly labeled on the
input connection identification.

Table 3-3. ADS1x48EVM Terminal Block Input Description (J5 and J6)

Terminal Block Input
J5:1
J5:2
J5:3
J5:4
J5:5
J5:6
J6:1
J6:2
J6:3
J6:4
J6:5
J6:6
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.
12 ADS1x48EVM Evaluation Module
Figure 3-6 shows the input layout.
Label
TC+
TC–
REF5025
REFOUT
NTC+
NTC–
REFP1
REFN1
RTD_A
RTD_B
RTD_C
GND
Copyright © 2022 Texas Instruments Incorporated
Table 3-3
PCB silkscreen
Description
Positive thermocouple, general-purpose input
Negative thermocouple, general-purpose input
2.5-V output from REF5025
2.048-V output from ADS1x48 integrated VREF
Positive thermistor input
Negative thermistor input
Positive external VREF input to ADC
Negative external VREF input to ADC
RTD connection point A
RTD connection point B
RTD connection point C
Analog ground
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