RES31A10DDFR datasheet(30/50 Pages) TI2

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IN+

ADC

RES31A

–

OPA392

IN–

IN1

IN2

–

OPA392

OUT

REF

GND

Figure 8-8. Differential-Input, Single-Ended Output Instrumentation Amplifier Using the RES31A

8.1.5 Fully Differential Amplifier

The RES31A can be used to set the gain of a fully differential amplifier, such as the THP210. The ratiometric

matching between the two resistor dividers leads to improved gain matching and CMRR performance for the

circuit, when compared to a similar implementation using unmatched discrete resistors.

Figure 8-9 shows a generic schematic representation of a fully differential amplifier driving a differential ADC,

with a RES31A used to set the amplifier gain.

VOUT+−VOUT−= VIN+−VIN− × RGRIN

(64)

IN+

ADC

RES31A

IN–

IN1

IN2

OUT+

THP210

OUT–

–

Figure 8-9. Fully-differential Amplifier Gain Setting Using RES31A

8.1.6 Unconventional Circuits

The two matched dividers of a RES31A are typically used independently of each other, as two well-matched

channels. The resistors are also useful in less conventional orientations, where resistors from both channels

are linked to achieve a wider range of transfer functions and effective "gains". While voltage dividers or

amplifier feedback paths are obvious candidates for this use, more unique applications such as "unbalanced"

instrumentation amplifier circuits also benefit from this approach.

RES31A

SLVSKC6 – DECEMBER 2025

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RES31A10DDFR Datasheet(PDF) 30 Page - Texas Instruments

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