REV. A

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a

OP27

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

Operational Amplifier

PIN CONNECTIONS

TO-99

(J-Suffix)

V+

OUT

NC

4V– (CASE)

BAL

BAL 1

–IN 2

+IN 3

OP27

NC = NO CONNECT

FEATURES

Low Noise: 80 nV p-p (0.1 Hz to 10 Hz), 3 nV/

Low Drift: 0.2

V/ C

High Speed: 2.8 V/ s Slew Rate, 8 MHz Gain

Bandwidth

V

±11 V

High Open-Loop Gain: 1.8 Million

Fits 725, OP07, 5534A Sockets

Available in Die Form

GENERAL DESCRIPTION

The OP27 precision operational amplifier combines the low

offset and drift of the OP07 with both high speed and low noise.

Offsets down to 25

µV and drift of 0.6 µV/°C maximum make

the OP27 ideal for precision instrumentation applications.

√Hz, at 10 Hz, a low 1/f

noise corner frequency of 2.7 Hz, and high gain (1.8 million),

allow accurate high-gain amplification of low-level signals. A

gain-bandwidth product of 8 MHz and a 2.8 V/

µsec slew rate

provides excellent dynamic accuracy in high-speed, data-

acquisition systems.

A low input bias current of

± 10 nA is achieved by use of a

bias-current-cancellation circuit. Over the military temperature

±20 nA and 15 nA,

respectively.

The output stage has good load driving capability. A guaranteed

swing of

±10 V into 600 Ω and low output distortion make the

OP27 an excellent choice for professional audio applications.

(Continued on page 7)

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.

*

NONINVERTING

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

Figure 1. Simplified Schematic

8-Pin Hermetic DIP

(Z-Suffix)

Epoxy Mini-DIP

(P-Suffix)

8-Pin SO

(S-Suffix)

8

7

6

5

1

2

3

4

NC = NO CONNECT

–IN

+IN

V+

OUT

NC

V–

OP27