Measurement Without Shunt - Texas Instruments INA282-286EVM User Manual

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2.2

Measurement Without Shunt

This connection method allows the user to either simulate the voltage developed across a sense resistor
based on a given set of system conditions, or to connect the INA282-286EVM remotely to an existing
shunt already included in an example application.
a shunt. As a result of the internal architecture of the INA282 family of devices, if this measurement
method is used, make sure the voltage source is either a very low impedance or the differential voltage
applied to the inputs is buffered to prevent additional errors in the circuit.
To configure a measurement evaluation without a shunt, follow these procedures.
1. Connect a differential voltage to the V
2. Measure the output voltage at the V
V
DIFF
+
V
CM
NOTE: The output voltage is equal to the reference voltage plus the gain of the device multiplied by
the differential voltage measured directly at the device input pins.
SBOU083 – September 2010
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and V
IN+
terminal of T2.
OUT
INA282-286EVM
Load
R
3
R C
I
1/2
1
S
R
4
+
V
IN
Figure 3. Measurement without Shunt
Copyright © 2010, Texas Instruments Incorporated
Figure 3 illustrates a measurement configuration without
terminals of T2.
IN–
2.7V to 18V
V+
INA282
V+
GND
Quick Start Setup and Use
V
OUT
REF
1
REF
2
INA282-INA286EVM
5