+

±

REF2

REF1

VS

GND

OUT

PWM

Rejection

IS+

IS±

IN+

IN±

SH+

SH±

2 m

0.1%

50 k

50 k

+

±

REF2

REF1

VS

GND

OUT

PWM

Rejection

IS+

IS±

IN+

IN±

SH+

SH±

2 m

0.1%

50 k

50 k

16

INA253

SLOS954A – JULY 2018 – REVISED DECEMBER 2018

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Copyright © 2018, Texas Instruments Incorporated

8.4 Device Functional Modes

8.4.1 Adjusting the Output Midpoint With the Reference Pins

Figure 33 shows a test circuit for reference-divider accuracy. The INA253 output is configurable to allow for

unidirectional or bidirectional operation.w

CAUTION

Do not connect the REF1 pin or the REF2 pin to any voltage source lower than GND

or higher than VS.

The output voltage is set by applying a voltage or voltages to the reference voltage inputs, REF1 and REF2. The

reference inputs are connected to an internal gain network. There is no operational difference between the two

reference pins.

Figure 33. Adjusting the Output Midpoint

8.4.2 Reference Pin Connections for Unidirectional Current Measurements

Unidirectional operation allows current measurements through a resistive shunt in one direction. For

unidirectional operation, connect the device reference pins together and then to the negative rail (see the Ground

Referenced Output section). The required differential input polarity depends on the output voltage setting. The

amplifier output moves away from the referenced rail proportional to the current passing through the internal

shunt resistor.

8.4.3 Ground Referenced Output

When using the INA253 in unidirectional mode with a ground-referenced output, both reference inputs are

connected to ground. Figure 34 shows how this configuration takes the output to ground when there is 0-A

flowing across the internal shunt.

Figure 34. Ground-Referenced Output