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; this configuration is shown in Figure 8-5.

The output voltage decreases below the reference voltage when the IN+ pin is negative relative to the IN– pin

and increases when the IN+ pin is positive relative to the IN– pin. This technique is the most accurate way to

bias the output to a precise voltage.

+

±

IN+

IN±

REF2

REF1

VS

GND

OUT

VS

REF5025

2.5-V

Reference

Copyright © 2016, Texas Instruments Incorporated

Figure 8-5. External Reference Output

8.4.3.2 Output Set to Midsupply Voltage

By connecting one reference pin to VS and the other to the GND pin, the output is set at half of the supply

when there is no differential input, as shown in Figure 8-6. This method creates a ratiometric offset to the supply

voltage, where the output voltage remains at VS / 2 for 0 V applied to the inputs.

+

±

IN+

IN±

REF2

REF1

VS

GND

OUT

Output

VS

Figure 8-6. Midsupply Voltage Output

8.4.3.3 Output Set to Mid-External Reference

In this case, an external reference is divided by two by connecting one REF pin to ground and the other REF pin

to the reference, as shown in Figure 8-7.

INA240

SBOS662C – JULY 2016 – REVISED DECEMBER 2021

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