PIN CONFIGURATIONS

REV. F

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a

Rail-to-Rail High Output

Current Operational Amplifiers

OP179/OP279

GENERAL DESCRIPTION

The OP179 and OP279 are rail-to-rail, high output current,

single-supply amplifiers. They are designed for low voltage

applications that require either current or capacitive load drive

capability. The OP179/OP279 can sink and source currents of

±60 mA (typical) and are stable with capacitive loads to 10 nF.

Applications that benefit from the high output current of the

OP179/OP279 include driving headphones, displays, transform-

ers and power transistors. The powerful output is combined with a

unique input stage that maintains very low distortion with

wide common-mode range, even in single supply designs.

The OP179/OP279 can be used as a buffer to provide much

greater drive capability than can usually be provided by CMOS

outputs. CMOS ASICs and DAC often have outputs that can

swing to both the positive supply and ground, but cannot drive

more than a few milliamps.

Bandwidth is typically 5 MHz and the slew rate is 3 V/

µs, mak-

ing these amplifiers well suited for single supply applications

that require audio bandwidths when used in high gain configu-

rations. Operation is guaranteed from voltages as low as 4.5 V,

up to 12 V.

Very good audio performance can be attained when using the

OP179/OP279 in +5 volt systems. THD is below 0.01% with a

600

Ω load, and noise is a respectable 21 nV/√Hz. Supply cur-

rent is less than 3.5 mA per amplifier.

The single OP179 is available in the 5-lead SOT-23-5 package.

It is specified over the industrial (–40

°C to +85°C) temperature

range.

The OP279 is available in 8-lead plastic DIP, TSSOP and

SO-8 surface mount packages. They are specified over the

industrial (–40

°C to +85°C) temperature range.

8-Lead SOIC and TSSOP

SO-8 (R) and RU-8

1

2

3

4

8

7

6

5

OP279

IN A

V

+IN A

OUT B

IN B

V+

+IN B

OUT A

8-Lead Plastic DIP

(N-8)

OUT A

–IN A

+IN A

–V

+V

OUT B

–IN B

+IN B

OP279

FEATURES

Rail-to-Rail Inputs and Outputs

High Output Current:

60 mA

Single Supply: +5 V to +12 V

Wide Bandwidth: 5 MHz

High Slew Rate: 3 V/ s

Low Distortion: 0.01%

Unity-Gain Stable

No Phase Reversal

Short Circuit Protected

Drives Capacitive Loads: 10 nF

APPLICATIONS

Multimedia

Telecom

DAA Transformer Driver

LCD Driver

Low Voltage Servo Control

Modems

FET Drivers

5-Lead SOT-23-5

(RT-5)

1

2

3

5

4

IN A

+IN A

V–

OUT A

OP179

V+

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 1999