INA282, INA283
INA284, INA285
INA286
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SBOS485A –NOVEMBER 2009–REVISED JULY 2010
UNIDIRECTIONAL OPERATION
Unidirectional operation allows the INA282 family to measure currents through a resistive shunt in one direction.
In the case of unidirectional operation, the output could be set at the negative rail (near ground, and the most
common connection) or at the positive rail (near V+) when the differential input is 0V. The output moves to the
opposite rail when a correct polarity differential input voltage is applied.
The required polarity of the differential input depends on the output voltage setting. If the output is set at the
positive rail, the input polarity must be negative to move the output down. If the output is set at ground, the
polarity is positive to move the output up.
The following sections describe how to configure the output for unidirectional operation.
Ground Referenced Output
When using the INA282 family in this mode, both reference inputs are connected to ground; this configuration
takes the output to the negative rail when there is 0V differential at the input (as Figure 34 shows).
Supply
-14V to +80V
Load
V+
+IN
-IN
V+
Æ1
Æ2
Æ2
Æ1
Æ2
Æ2
Æ1
Æ1
OUT
ZerÆ-
Drift
Output
GAIN
PRODUCT
50V/V
INA282
INA286
INA283
INA284
INA285
33.3kW
33.3kW
100V/V
200V/V
500V/V
1000V/V
REF2
REF1
GND
Figure 34. Ground Referenced Output
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