8.1 Application Information

8.1.1 Reference Pin

The output voltage of the INA151 is developed with respect to the voltage on the reference pin (REF). Often in

dual-supply operation, REF pin connects to the system ground. However, in single-supply operation, offsetting

the output signal to a precise mid-supply level is sometimes required (for example, 1.25V or 2.5V in a +5V

single-supply configuration).

To accomplish this level shift, a low-impedance voltage source must be connected to the REF pin to level-shift

the output so that the INA151 can drive a single-supply ADC.

This is accomplished using an external reference buffer configured in unity gain, voltage follower configuration

as shown in Figure 8-1. Take into consideration that INA151D (G=1/4) imposes operating restrictions outlined in

Section 7.3.3.

IN +

IN –

5V

OUT

R1

R2

C1

5V

TLV9041

EN

Figure 8-1. INA151 With External Reference Buffer

INA151

SLVSIL6C – JANUARY 2026 – REVISED APRIL 2026

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