REV. C

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 that

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

under any patent or patent rights of Analog Devices.

a

OP221

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

Tel: 781/329-4700

www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2002

Dual Low Power Operational Amplifier,

Single or Dual Supply

FEATURES

V/ C Max

Low Input Offset Voltage, 150

V Max

Low Supply Current, 550

A Max

Single Supply Operation, 5 V to 30 V

Low Input Offset Voltage Drift, 0.75

V/ C

High Open-Loop Gain, 1500 V/mV Min

High PSRR, 3

V/V

Wide Common-Mode Voltage

Range, V– to within 1.5 V of V+

Pin Compatible with 1458, LM158, LM2904

Available in Die Form

GENERAL DESCRIPTION

The OP221 is a monolithic dual operational amplifier that can

be used either in single or dual supply operation. The wide

supply voltage range, wide input voltage range, and low supply

current drain of the OP221 make it well-suited for operation

from batteries or unregulated power supplies.

The excellent specifications of the individual amplifiers combined

with the tight matching and temperature tracking between channels

SIMPLIFIED SCHEMATIC

Q1

–IN

+IN

*ACCESSIBLE IN CHIP FORM ONLY

Q3

Q4

Q5

Q6

Q2

Q7

Q9

Q10

Q12

Q11

Q4

Q13

NULL*

Q26

Q28

Q27

Q29

Q33

V+

OUTPUT

V–

8-Lead SOIC

(S-Suffix)

8

7

6

5

1

2

3

4

NC = NO CONNECT

+IN A

V–

+IN B

–IN A

OUT A

V+

OUT B

–IN B

PIN CONNECTIONS

provide high performance in instrumentation amplifier designs.

The individual amplifiers feature very low input offset voltage,

low offset voltage drift, low noise voltage, and low bias current.

They are fully compensated and protected.

Matching between channels is provided on all critical parameters

including input offset voltage, tracking of offset voltage vs. tem-

perature, non-inverting bias currents, and common-mode rejection.