INA821 datasheet(23/45 Pages) TI

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7 Detailed Description

7.1 Overview

The INA592 consists of a high precision, e-trim™ op amp and four trimmed resistors. These resistors can be

connected to make a wide variety of amplifier configurations, including difference, noninverting, and inverting

configurations. Using the on-chip resistors of the INA592 provides the designer with several advantages over a

discrete design. The INA59 also includes internal compensation capacitors, as shown in Section 7.2.

7.2 Functional Block Diagram

V+

V±

REF

6 k

12 k

6 k

12 k

OUT

+IN

±IN

SENSE

16 pF

V±

INA592

7.3 Feature Description

Much of the dc performance of op amp circuits depends on the accuracy of the surrounding resistors. The

resistors on the INA592 are laid out to be tightly matched. The resistors of each part are matched on-chip and

tested for their matching accuracy. As a result of this trimming and testing, the INA592 provides high accuracy

for specifications such as gain drift, common-mode rejection, and gain error.

7.4 Device Functional Modes

The INA592 can measure voltages beyond the rails. For the G = ½ and G = 2 difference amplifier configurations,

see the input voltage range in Section 6.5 and Section 6.6 for details. The INA592 can be configured in several

ways; see Figure 8-5 to Figure 8-9. These configurations rely on the internal, matched resistors,; therefore all of

these configurations have excellent gain accuracy and gain drift.

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INA592

SBOS914E – OCTOBER 2018 – REVISED FEBRUARY 2021

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INA821 Datasheet(PDF) 23 Page - Texas Instruments