OPA375 datasheet(26/64 Pages) TI

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8 Detailed Description

8.1 Overview

The OPAx375 family is an ultra low-noise, rail-to-rail output operational amplifier. The device operates from

a supply voltage of 2.25 V to 5.5 V (OPA375) and 1.7 V to 5.5 V (OPA2375 and OPA4375), are unity-gain

stable, and suitable for a wide range of general-purpose applications. The input common-mode voltage range

includes the negative rail and allows the OPAx375 op amp family to be used in most single-supply applications.

Rail-to-rail output swing significantly increases dynamic range, especially in low-supply applications, and makes

it suitable for many audio applications and driving sampling analog-to-digital converters (ADCs).

8.2 Functional Block Diagram

Reference

Current

V+

IN-

IN+

(Ground)

BIAS2

BIAS1

Class AB

Control

Circuitry

8.3 Feature Description

8.3.1 THD + Noise Performance

The OPAx375 operational amplifier family has excellent distortion characteristics. OPA2375 and OPA4375 THD

+ Noise is below 0.00015% (G = +1, VO = 1 VRMS, VCM = 1.8 V, VS = 5.5 V) throughout the audio frequency

range, 20 Hz to 20 kHz, with a 10-kΩ load. The broadband noise of the 3.5 nV/√ Hz (OPA2375/4375) and 3.7

nV/√ Hz (OPA375) is extremely low for a 10-MHz general purpose amplifier.

8.3.2 Operating Voltage

The OPAx375 operational amplifier family is fully specified and can operate from 1.7 V to 5.5 V (OPA2375/4375)

and 2.25 V to 5.5 V (OPA375). In addition, many specifications apply from –40°C to 125°C. Power-supply pins

must be bypassed with 0.1-µF ceramic capacitors.

8.3.3 Rail-to-Rail Output

Designed as low-power, low-voltage op amps, the OPAx375 devices deliver a robust output drive capability.

A class AB output stage with common-source transistors achieves full rail-to-rail output swing capability. For

resistive loads of 10 kΩ, the output swings to within few mV of either supply rail, regardless of the applied

power-supply voltage. Different load conditions change the ability of the amplifier to swing close to the rails, see

Figure 7-71.

OPA375, OPA2375

SBOS886E – NOVEMBER 2017 – REVISED AUGUST 2021

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OPA375 Datasheet(PDF) 26 Page - Texas Instruments