2.1 Terminal Blocks and Test Points
Analog inputs to the EVM can be connected to either terminal block associated with each ADC channel. The
screw terminal blocks (J1 through J5) can interface directly with the leads of an external source.
lists
lists key test points.
An input must not be applied such that the voltage on the input pins of the ADS131B26-Q1 exceeds the absolute
maximum ratings. For more details, see the
.
Table 2-1. Analog Input Terminal Blocks (J1 - J5)
Terminal
Block
Pin
Function
Input Range
ADS131B26-Q1 Input Pins
J1
1
Unipolar voltage input
0 V to 10 V (Gain = 1)
V1A
2
Unipolar voltage input
0 V to 1.25 V (Gain = 1)
V0A
3
Differential voltage, positive input or
general-purpose digital input/output
–10 V to 10 V (Gain = 4)
VPA/GPIO0A
4
Differential voltage, negative input or
general-purpose digital input/output
Shorted to AGND (default)
VNA/GPIO1A
5
Differential current, positive input
0 mA to 12.5 mA (Gain = 1)
CPA
6
Differential current, negative input
Shorted to AGND (default)
CNA
J2
1
AGND
－
AGND, AGNDA, and AGNDB
2
AGND
－
AGND, AGNDA, and AGNDB
J3
1
Differential voltage, negative input or
general-purpose digital input/output
Shorted to AGND (default)
VNB/GPIO1B
2
Differential voltage, positive input or
general-purpose digital input/output
–10 V to 10 V (Gain = 4)
VPB/GPIO0B
3
Differential current, negative input
Shorted to AGND (default)
CNB
4
Differential current, positive input
0 mA to 12.5 mA (Gain = 1)
CPB
5
Unipolar voltage input
0 V to 1.25 V (Gain = 1)
V0B
6
Unipolar voltage input
0 V to 10 V (Gain = 1)
V1B
J4
1
Unipolar voltage input
0 V to 10 V (Gain = 1)
V2B
2
Unipolar voltage input
–10 V to 10 V (Gain = 4)
V3B
3
Unipolar voltage input
–10 V to 10 V (Gain = 4)
V4B
4
Unipolar voltage input
–8.5 V to 10 V (Gain = 2)
V5B
5
Unipolar voltage input
–8.5 V to 10 V (Gain = 2)
V6B
6
Unipolar voltage input
V7B
J5
1
Unipolar voltage input
V7A
2
Unipolar voltage input
–8.5 V to 10 V (Gain = 2)
V6A
3
Unipolar voltage input
–8.5 V to 10 V (Gain = 2)
V5A
4
Unipolar voltage input
–10 V to 10 V (Gain = 4)
V4A
5
Unipolar voltage input
–10 V to 10 V (Gain = 4)
V3A
6
Unipolar voltage input
0 V to 10 V (Gain = 1)
V2A
Table 2-2. Key Voltage Test Points
Test Point
Function
Input Range
ADS131B26-Q1 Input Pins
TP1
Probe VNA or GPIO0A
–10 V to 10 V (Gain = 4)
VPA/GPIO0A
TP2
Probe VPB or GPIO0B
–10 V to 10 V (Gain = 4)
VPB/GPIO0B
TP3
Ground clip for scope / multimeter
－
AGND, AGNDA, and AGNDB
TP4
Ground clip for scope / multimeter
－
AGND, AGNDA, and AGNDB
TP5
Probe VNA or GPIO1A
Shorted to AGND (default)
VNA/GPIO1A
TP6
Probe VNB or GPIO1B
Shorted to AGND (default)
VNB/GPIO1B
Analog Interface
6
ADS131B26Q1EVM-PDK Evaluation Module
SBAU413 – OCTOBER 2022
Copyright © 2022 Texas Instruments Incorporated
