Reference

Current

V+

V

IN+

V

INÛ

VÛ

(Ground)

V

BIAS2

V

BIAS1

Class AB

Control

Circuitry

V

O

100 k

PD

PD block

NMOS input pair

for phase reversal

protection only

8

OPAX607

SBOS981B – OCTOBER 2019 – REVISED FEBRUARY 2020

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8 Detailed Description

8.1 Overview

The OPAX607 is a low-noise, rail-to-rail output (RRO) operational amplifier (op amp). The device operates 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 op amp 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

8.3 Feature Description

8.3.1 Operating Voltage

The OPAX607 operational amplifier is fully specified and assured for operation from 2.2 V to 5.5 V, applicable

from –40°C to +125°C. The OPAX607 is completely operational with asymmetric voltages applied across the

Absolute Maximum Ratings table.