8.4.2.1 Ground Referenced Output

When using the INA241x 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).

+

±

REF2

REF1

VS

GND

OUT

VS

IN+

IN±

Figure 8-2. Ground Referenced Output

8.4.2.2 VS Referenced Output

Unidirectional mode with a VS referenced output is configured by connecting both reference pins to the positive

supply. Use this configuration for circuits that require power up and stabilization of the amplifier output signal and

other control circuitry before power is applied to the load (see Figure 8-3).

+

±

REF2

REF1

VS

GND

OUT

VS

IN+

IN±

Figure 8-3. VS Referenced Output

8.4.3 Reference Pin Connections for Bidirectional Current Measurements

The INA241x measures the differential voltage developed by current flowing through a resistor, commonly

referred to as a current-sensing resistor or a current-shunt resistor. The INA241x can operate in either a

unidirectional or bidirectional mode based on the voltage potential placed on the reference pins.

The linear range of the output stage is limited to how close the output voltage can approach ground as well the

supply voltage as described in the Specifications. The selection of the current-sensing resistor along with the

current range to be measured, selection of the gain option, as well as the voltage applied to the reference pins

should chosen to ensure to keep the INA241x within the linear region of operation.

8.4.3.1 Output Set to External Reference Voltage

Connecting both pins together and then to a reference voltage results in an output voltage equal to the reference

voltage for the condition of shorted input pins or a 0-V differential input. Figure 8-4 shows this configuration. The

INA241A, INA241B

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