OPA186DBVT datasheet(17/48 Pages) TI1

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7 Detailed Description

7.1 Overview

The OPAx186 operational amplifier combines precision offset and drift with excellent overall performance,

making the device a great choice for a wide variety of precision applications. The precision offset drift of only

0.01 µV/°C provides stability over the entire operating temperature range of –40°C to +125°C. In addition, this

device offers 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. For details and a layout example, see Section 8.4.

The OPAx186 is part of a family of zero-drift, MUX-friendly, rail-to-rail output operational amplifiers. This device

operates from 4.5 V to 24 V, is unity-gain stable, and is 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 at less than the chopper frequency.

The following section shows a representation of the proprietary OPAx186 architecture.

7.2 Functional Block Diagram

+IN

±IN

CHOP1

CHOP2

Notch

Filter

GM2

GM3

OUT

GM_FF

GM1

24-V

Differential

Front End

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OPA186, OPA2186, OPA4186

SBOS968C – JUNE 2022 – REVISED JULY 2023

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OPA186DBVT датащи(PDF) 17 Page - Texas Instruments