REV. B

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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

OP37

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

Low Noise, Precision, High Speed

SIMPLIFIED SCHEMATIC

V–

V+

Q2B

R2*

Q3

Q2A

Q1A

Q1B

R4

R1*

R3

18

R1 AND R2 ARE PERMANENTLY

ADJUSTED AT WAFER TEST FOR

MINIMUM OFFSET VOLTAGE.

*

NON-INVERTING

INPUT (+)

INVERTING

INPUT (–)

Q6

Q21

C2

R23

R24

Q23

Q24

Q22

R5

Q11

Q12

Q27

Q28

C1

R9

R12

C3

C4

Q26

Q20

Q19

Q46

Q45

OUTPUT

FEATURES

Low Noise, 80 nV p-p (0.1 Hz to 10 Hz)

3 nV/

÷Hz @ 1 kHz

Low Drift, 0.2

V/ C

High Speed, 17 V/ s Slew Rate

63 MHz Gain Bandwidth

Low Input Offset Voltage, 10

V

Excellent CMRR, 126 dB (Common-Voltage @ 11 V)

High Open-Loop Gain, 1.8 Million

Replaces 725, OP-07, SE5534 In Gains > 5

Available in Die Form

GENERAL DESCRIPTION

The OP37 provides the same high performance as the OP27,

but the design is optimized for circuits with gains greater than

five. This design change increases slew rate to 17 V/

ms and

gain-bandwidth product to 63 MHz.

The OP37 provides the low offset and drift of the OP07

plus higher speed and lower noise. Offsets down to 25

mV and

a maximum drift of 0.6

mV/∞C make the OP37 ideal for preci-

sion instrumentation applications. Exceptionally low noise

2.7 Hz, and the high gain of 1.8 million, allow accurate

high-gain amplification of low-level signals.

The low input bias current of 10 nA and offset current of 7 nA

are achieved by using a bias-current cancellation circuit. Over

to 20 nA and 15 nA respectively.

PIN CONNECTIONS

8-Lead Hermetic DIP

(Z Suffix)

Epoxy Mini-DIP

(P Suffix)

8-Lead SO

(S Suffix)

8

7

6

5

1

2

3

4

NC = NO CONNECT

–IN

+IN

V+

OUT

NC

V–

OP37

The output stage has good load driving capability. A guaranteed

swing of 10 V into 600

W and low output distortion make the

OP37 an excellent choice for professional audio applications.

PSRR and CMRR exceed 120 dB. These characteristics, coupled

with long-term drift of 0.2

mV/month, allow the circuit designer

to achieve performance levels previously attained only by

discrete designs.

Low-cost, high-volume production of the OP37 is achieved by

using on-chip zener-zap trimming. This reliable and stable offset

trimming scheme has proved its effectiveness over many years of

production history.

The OP37 brings low-noise instrumentation-type performance to

such diverse applications as microphone, tapehead, and RIAA

phono preamplifiers, high-speed signal conditioning for data

acquisition systems, and wide-bandwidth instrumentation.