50 V/V, 100 V/V, and 200 V/V, which the system designer should select based on their desired signal-to-noise

ratio and other system requirements such as the dynamic current range and full-scale output voltage target.

8.3.1.5 Wide Supply Range

The INA296x operates with a wide supply range from 2.7 V to 20 V. While the input voltage range of the

INA296x is independent of the supply voltage, the output voltage is bound by the supply voltage applied to the

device. The output voltage can range from as low as 20 mV to has high as 200 mV below the supply voltage.

8.4 Device Functional Modes

8.4.1 Adjusting the Output With the Reference Pins

Figure 8-1 shows a test circuit for reference-divider accuracy. The INA296x output is configurable to allow for

unidirectional or bidirectional operation.

+

±

REF2

REF1

VS

GND

OUT

VS

IN+

IN±

Figure 8-1. Test Circuit For Reference Divider Accuracy

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.

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) or the positive rail (see the VS 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 external shunt resistor. If the amplifier reference

pins are connected to the positive rail, then the input polarity must be negative to move the amplifier output down

(towards ground). If the amplifier reference pins are connected at ground, then the input polarity must be positive

to move the amplifier output up (towards supply).

The following sections describe how to configure the output for unidirectional operation cases.

8.4.2.1 Ground Referenced Output

When using the INA296x in a unidirectional mode with a ground referenced output, both reference inputs are

connected to ground. This configuration takes the output to ground when there is a 0-V differential at the input

(see Figure 8-2).

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SBOSA04 – MARCH 2022

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