8 Detailed Description

8.1 Overview

The OPAx607 devices are low-noise, rail-to-rail output (RRO) operational amplifiers (op amp). The devices

operate from a supply voltage of 2.2 V to 5.5 V. The input common-mode voltage range also extends down to

the negative rail allowing the OPAx607 to be used in most single-supply applications. Rail-to-rail output swing

significantly increases dynamic range, especially in low-supply, voltage-range applications, which results in

complete usage of the full-scale range of the consecutive analog-to-digital converters (ADCs). The

decompensated architecture allows for a favorable tradeoff of low-quiescent current for a very-high gain-

bandwidth product (GBW) and low-distortion performance in high-gain applications.

8.2 Functional Block Diagram

Reference

Current

V+

V

IN+

V

INÛ

VÛ

(Ground)

V

BIAS2

V

BIAS1

Class AB

Control

Circuitry

V

O

7.5M

PD

PD block

NMOS input pair

for phase reversal

protection only

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OPA607, OPA2607

SBOS981F – OCTOBER 2019 – REVISED SEPTEMBER 2020

Copyright © 2020 Texas Instruments Incorporated

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Product Folder Links: OPA607 OPA2607