Ultralow Power, Rail-to-Rail Output

Operational Amplifiers

OP281/OP481

Rev. C

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FEATURES

Low supply current: 4 μA/amplifier maximum

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 is specified at +3 V

and +5 V single supplies as well as ±5 V dual supplies.

Fabricated on Analog Devices’ CBCMOS process, the

OP281/OP481 feature a precision bipolar input and an output

that swings to within millivolts of the supplies, continuing to

sink or source current up to a voltage equal to the supply voltage.

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 μs.

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

OUT A

V+

OUT B

–IN A

+IN A

V–

+IN B

–IN B

1

2

3

4

8

7

6

5

OP281

TOP VIEW

(Not to Scale)

Figure 1. 8-Lead

Narrow-Body SOIC

(R Suffix)

TOP VIEW

(Not to Scale)

OP281

1

2

3

4

8

7

6

5

OUT A

V+

OUT B

–IN A

+IN A

V–

+IN B

–IN B

Figure 2. 8-Lead TSSOP

(RU Suffix)

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

1

2

3

4

14

13

12

11

5

10

6

9

7

8

OP481

TOP VIEW

(Not to Scale)

Figure 3. 14-Lead

Narrow-Body SOIC

(R Suffix)

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

OP481

1

2

3

4

5

6

7

14

13

12

11

10

9

8

TOP VIEW

(Not to Scale)

Figure 4. 14-Lead TSSOP

(RU Suffix)