ADC

+

±

REF2

REF1

VS

GND

OUT

PWM

Rejection

IS+

IS±

IN+

IN±

SH+

SH±

2 m

0.1%

50 k

50 k

+

±

R1

R2

+

±

REF2

REF1

VS

GND

OUT

PWM

Rejection

IS+

IS±

IN+

IN±

SH+

SH±

2 m

0.1%

50 k

50 k

REF5025

2.5-V

Reference

18

INA253

SLOS954A – JULY 2018 – REVISED DECEMBER 2018

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Copyright © 2018, Texas Instruments Incorporated

Device Functional Modes (continued)

8.4.6 Output Set to Mid-External Reference

In this example, 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 37.

Figure 37. Mid-External Reference Output

8.4.7 Output Set Using Resistor Divide

The INA253 REF1 and REF2 pins allow for the midpoint of the output voltage to be adjusted for system circuitry

connections to analog to digital converters (ADCs) or other amplifiers. The REF pins are designed to be

connected directly to supply, ground, or a low-impedance reference voltage. The REF pins can be connected

together and biased using a resistor divider to achieve a custom output voltage. If the amplifier is used in this

configuration, as shown in Figure 38, use the output as a differential signal with respect to the resistor divider

voltage. For most accurate results, do not use single-ended measurements at the amplifier output because the

internal impedance shifts can adversely affect device performance specifications.

Figure 38. Setting the Reference Using a Resistor Divider