REV. 0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

a

OP181/OP281/OP481

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

Tel: 617/329-4700

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

Fax: 617/326-8703

© Analog Devices, Inc., 1996

Ultralow Power, Rail-to-Rail Output

Operational Amplifiers

PIN CONFIGURATIONS

FEATURES

Low Supply Current: 4

A/Amplifier max

Single-Supply Operation: 2.7 V to 12 V

Wide Input Voltage Range

Rail-to-Rail Output Swing

Low Offset Voltage: 1.5 mV

No Phase Reversal

APPLICATIONS

Comparator

Battery Powered Instrumentation

Safety Monitoring

Remote Sensors

Low Voltage Strain Gage Amplifiers

GENERAL DESCRIPTION

The OP181, OP281 and OP481 are single, dual and quad

ultralow power, single-supply amplifiers featuring rail-to-rail

outputs. All operate from supplies as low as 2.0 V and are

specified at +3 V and +5 V single supply as well as

±5 V dual

supplies.

Fabricated on Analog Devices’ CBCMOS process, the OP181

family features a precision bipolar input and an output that

swings to within millivolts of the supplies and continues to sink

or source current all the way to the supplies.

Applications for these amplifiers include safety monitoring,

portable equipment, battery and power supply control, and

signal conditioning and interface for transducers in very low

power systems.

The output’s ability to swing rail-to-rail and not increase supply

current, when the output is driven to a supply voltage, enables

the OP181 family to be used as comparators in very low power

systems. This is enhanced by their fast saturation recovery time.

Propagation delays are 250

µs.

The OP181/OP281/OP481 are specified over the extended

industrial (–40

°C to +85°C) temperature range. The OP181,

single, and OP281, dual, amplifiers are available in 8-pin plastic

DIPs and SO surface mount packages. The OP281 is also

available in 8-lead TSSOP. The OP481 quad is available in 14-

pin DIPs, narrow 14-pin SO and TSSOP packages.

NC = NO CONNECT

8

7

6

5

1

2

3

4

NULL

V+

NULL

NC

OUT A

–IN A

+IN A

V–

OP181

NC = NO CONNECT

NULL

V+

NULL

NC

OUT A

–IN A

+IN A

V–

1

4

5

8

OP181

8-Lead SO

8-Lead Epoxy DIP

(S Suffix)

(P Suffix)

8

7

6

5

1

2

3

4

OP281

OUT A

V+

+IN B

–IN B

OUT B

–IN A

+IN A

V–

OUT A

V+

OUT B

–IN A

+IN A

V–

+IN B

–IN B

1

4

5

8

OP281

8-Lead SO

8-Lead Epoxy DIP

(S Suffix)

(P Suffix)

14-Lead Epoxy DIP

14-Lead

(P Suffix)

Narrow-Body SO

(S Suffix)

8-Lead TSSOP

(RU Suffix)

OP281

1

4

5

8

14

13

12

11

10

9

8

1

2

3

4

7

6

5

OUT A

V–

+IN D

–IN D

OUT D

–IN A

+IN A

V+

OUT C

–IN C

+IN C

+IN B

–IN B

OUT B

OP481

1

7

8

14

OP481

14-Lead TSSOP

(RU Suffix)

OP481

1

78

14

NOTE: PIN ORIENTATION IS EQUIVALENT FOR

EACH PACKAGE VARIATION