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OP281/OP481

Ultralow Power, Rail-to-Rail Output

Operational Amplifiers

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 OP281 and OP481 are dual and quad ultralow power, single-

supply amplifiers featuring rail-to-rail outputs. Each operates

from supplies as low as 2.0 V and are specified at +3 V and +5 V

single supply as well as

±5V dual supplies.

Fabricated on Analog Devices’ CBCMOS process, the

OP281/OP481 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 interfacing 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 OP281/OP481 to be used as comparators in very low power

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

Propagation delays are 250

ms.

The OP281/OP481 are specified over the extended industrial

temperature range (–40

∞C to +85∞C). The OP281 dual amplifier

is available in 8-lead SOIC surface-mount and TSSOP packages.

The OP481 quad amplifier is available in narrow 14-lead SOIC

and TSSOP packages.

PIN CONFIGURATIONS

14-Lead

Narrow-Body SOIC

(R Suffix)

1

7

8

14

OP481

OUT A

–IN A

+IN A

V+

+IN B

–IN B

OUT B

OUT D

–IN D

+IN D

V–

+IN C

–IN C

OUT C

8-Lead SOIC

(R Suffix)

OUT A

V+

OUT B

–IN A

+IN A

V–

+IN B

–IN B

1

4

5

8

OP281

14-Lead TSSOP

(RU Suffix)

OP481

1

7

8

14

NOTE: PIN ORIENTATION IS EQUIVALENT FOR

EACH PACKAGE VARIATION

8-Lead TSSOP

(RU Suffix)

OP281

1

4

5

8