OPAX189 datasheet(20/52 Pages) TI

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8 Detailed Description

8.1 Overview

The OPAx189 operational amplifiers combine precision offset and drift with excellent overall performance,

making these devices an excellent choice for many precision applications. The precision offset drift of only

0.005 µV/°C provides stability over the entire temperature range. In addition, these devices offer excellent linear

performance with high CMRR, PSRR, and AOL. As with all amplifiers, applications with noisy or high-impedance

power supplies require decoupling capacitors close to the device pins. In most cases, 0.1-µF capacitors are

adequate. See the Layout Guidelines section for details and layout example.

The OPAx189 are part of a family of zero-drift, MUX-friendly, rail-to-rail output operational amplifiers. These

devices operate from 4.5 V to 36 V, are unity-gain stable, and are designed for a wide range of general-purpose

and precision applications. The zero-drift architecture provides ultra-low input offset voltage and near-zero

input offset voltage drift over temperature and time. This choice of architecture also offers outstanding ac

performance, such as ultra-low broadband noise, zero flicker noise, and outstanding distortion performance

when operating below the chopper frequency.

8.2 Functional Block Diagram

The Functional Block Diagram shows a representation of the proprietary OPAx189 architecture.

Slew Boost Circuit

Protection

Switches

Ripple

Reduction FB

Loop

CLK

OUT

+IN

±IN

CCOMP

GM_FF

GM1

GM2

GM3

CCOMP

OPA189, OPA2189, OPA4189

SBOS830I – SEPTEMBER 2017 – REVISED OCTOBER 2021

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OPAX189 데이터시트(PDF) 20 Page - Texas Instruments