RES31A00DDFR datasheet(22/50 Pages) TI2

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8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

8.1.1 Amplifier Feedback Circuit

The RES31A is typically used to implement the feedback path of an operational amplifier, and thus set the circuit

gain. This circuit is configured as either inverting or noninverting, with the input voltage being applied to that

respective amplifier input, and is generically drawn in the following figure.

–

GND

–

OUT

Figure 8-1. Inverting Amplifier Configuration

–

GND

OUT

–

Figure 8-2. Noninverting Amplifier Configuration

For the inverting circuit configuration:

GInv=RXRY

(18)

VOUT=–VIN×GInv

(19)

For the noninverting circuit configuration:

GNoninv=1+RXRY

(20)

VOUT=VIN×GNoninv

(21)

Typically, RX = RG and RY = RIN, allowing noninverting gains from 2 to 11 to be achieved. Inverting gains range

in this configuration from –1 to –10. More unique configurations are also possible; see also Section 8.1.6.2.

Gx=Gnom1+tDx

(22)

RES31A

SLVSKC6 – DECEMBER 2025

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RES31A00DDFR Datasheet(PDF) 22 Page - Texas Instruments