RES11A10DDFR datasheet(29/56 Pages) TI2

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If the circuit configuration is inverted so that RX = RIN1 and RY = RG1, then the initial value of tVD1 is calculated

as:

tVD1= tD1

Gnom×tD1+Gnom+1= 0.000085

4×0.000085+4+1=0.000017=17ppm

(39)

The new value of tVD1 after the temperature change is calculated as:

tVD1= tD1

Gnom×tD1+Gnom+1= 0.000090

4×0.000090+4+1=0.000018=18ppm

(40)

In this second scenario, the shift in tD1 of 5ppm causes a shift in tVD1 of only 1ppm.

8.1.3 Discrete Difference Amplifier

The RES11A is commonly used to implement a simple difference amplifier. The ratiometric matching between

the two resistor dividers improves CMRR performance and gain drift for the circuit, when compared to a similar

implementation using unmatched discrete resistors. The basic circuit is shown in Figure 8-6.

VOUT= VIN+−VIN− × RGRIN +VREF

(41)

IN+

ADC

RES11A

–

OPA392

IN–

GND

REF

IN1

IN2

OUT

Figure 8-6. Discrete Difference Amplifier Using RES11A

8.1.3.1 Difference-Amplifier Common-Mode Rejection Analysis

In this simple difference amplifier configuration, the nominal CMRR is calculated as:

CMRR=20×log10 ADACM

(42)

The term AD is the differential gain of the circuit, and the term ACM is the common-mode gain of the circuit.

These are defined as the following:

AD×=VOUTVD=0.5× RG1

RG1+RIN1 + RG2

RG2+RIN2

RIN2

RG2+RIN2

(43)

ACM=VOUTVCM= RG1

RG1+RIN1 − RG2

RG2+RIN2

RIN2

RG2+RIN2

(44)

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RES11A

SLPS785A – DECEMBER 2023 – REVISED OCTOBER 2025

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