INA2180-2181EVM Hardware
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SBOU188 – August 2017
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Copyright © 2017, Texas Instruments Incorporated
INA2180-2181 Evaluation Module User's Guide
2.1
Features
The layout of the INA2180-2181EVM printed-circuit board (PCB) is designed to provide the following
features:
•
Evaluation of all gain options for the INA2180Ax and INA2181Ax
•
Ease of access to device pins with test points
•
Capability to evaluate high-side and low-side configurations
See the
INA2180
and
INA2181
data sheets for comprehensive information about the INA2180 and
INA2181 family of devices.
3
Quick Start Setup and Use
The following are instructions to set up and use the INA2180Ax devices of the INA2180-2181EVM.
Step 1.
Connect an external dc supply voltage between 2.7 V and 5.5 V to the VS test point, and
connect ground reference of that supply to the GND test point.
Step 2.
Connect the input per
Section 3.1
.
The following are instructions to set up and use the INA2181Ax devices of the INA2180-2181EVM.
Step 1.
Connect an external dc supply voltage between 2.7 V and 5.5 V to the VS test point, and
connect ground reference of that supply to the GND test point.
Step 2.
Connect an external supply to the REF1 and REF2 test points. This reference voltage can be
set anywhere from 0 V to VS. Further details regarding the use of the reference voltage are
discussed later in
Section 5
.
Step 3.
Connect the input per
Section 3.1
.
3.1
Measurements
The INA2180-2181EVM enables the user to either simulate the voltage developed across a sense resistor
based on a given set of system conditions or to connect remotely to an existing shunt already included in
an example application.
The following procedures are used to configure a measurement evaluation without a shunt.
•
Channel 1:
Step 1.
Connect a differential voltage to the IN+1 and IN–1 test points.
Step 2.
Measure the output voltage at the OUT1 test point.
•
Channel 2:
Step 1.
Connect a differential voltage to the IN+2 and IN–2 test points.
Step 2.
Measure the output voltage at the OUT2 test point.
NOTE:
The output voltage is equal to the gain of the device multiplied by the differential voltage
measured directly at the device input pins.
4
INA2180-2181EVM Circuit
This section summarizes the INA2180-2181EVM components. For the following instructions, x = 1 to 8.
4.1
Rx1, Rx2, Rx3, Rx4, Cx2, Cx3
Rx1 and Rx2 (Rx3 and Rx4 for Channel 2) are factory-installed 0-
Ω
resistors. These resistors, in
combination with Cx2 (Cx3 for Channel 2), form an input filter. These locations allow for 0805 surface-
mount package size. Additional information regarding the use of input filtering is provided in the
INA2180
and
INA2181
product data sheets.
