INA821 datasheet(22/47 Pages) TI

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8 Detailed Description

8.1 Overview

The INA597 consists of a high-precision, e-trim™ operational amplifier 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 INA597 provides the designer with several

advantages over a discrete design. The INA597 also includes internal compensation capacitors, as shown in

Section 8.2.

8.2 Functional Block Diagram

V+

V±

REF

6 k

12 k

6 k

12 k

OUT

+IN

±IN

SENSE

16 pF

V±

INA597

8.3 Feature Description

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

resistors on the INA597 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 INA597 provides high accuracy

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

8.4 Device Functional Modes

The INA597 measures voltages beyond the rails. For the G = ½ and G = 2 difference amplifier configurations,

see the input voltage range in Section 7 for details. The INA597 can be configured in several ways; see

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

configurations have excellent gain accuracy and gain drift.

INA597

SBOS385B – AUGUST 2019 – REVISED APRIL 2021

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INA821 Datasheet(PDF) 22 Page - Texas Instruments