REV. 0

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a

OP777

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

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2000

Precision Micropower

Single Supply

Operational Amplifier

FUNCTIONAL BLOCK DIAGRAMS

8-Lead MSOP

(RM Suffix)

IN

IN

V

V+

OUT

NC

NC

1

45

8

OP777

NC

NC = NO CONNECT

8-Lead SOIC

(R Suffix)

1

2

3

4

8

7

6

5

OP777

IN

V

+IN

V+

OUT

NC

NC

NC

NC = NO CONNECT

FEATURES

Low Offset Voltage: 100

V Max

Low Input Bias Current: 10 nA Max

Single-Supply Operation: 2.7 V to 30 V

Dual-Supply Operation:

1.35 V to

15 V

Low Supply Current: 270

A/Amp

Unity Gain Stable

No Phase Reversal

APPLICATIONS

Precision Current Measurement

Line or Battery-Powered Instrumentation

Remote Sensors

Precision Filters

GENERAL DESCRIPTION

The OP777 is a precision single supply amplifier featuring

micropower operation and rail-to-rail output ranges. This ampli-

fier provides improved performance over the industry-standard

OP07 with

±15 V supplies and offers the further advantage of

true single supply operation down to 2.7 V, and smaller package

footprint than any other high-voltage precision bipolar amplifier.

Outputs are stable with capacitive loads of over 1000 pF. Supply

current is less than 300

µA per amplifier at 5 V. 500 Ω series resis-

tors protect the inputs, allowing input signal levels to exceed either

power supply rail by up to 3 V without causing phase reversal of the

output signal or causing damage to the amplifier. The proprietary

fabrication process yields a very low-voltage noise corner frequency

under 10 Hz, greatly improving the low-frequency noise perfor-

mance of the OP07 and similar amplifiers. The specially fabricated

input PNP transistors operate with very low input bias currents while

allowing operation with large differential voltages, eliminating a

common limitation of many precision amplifiers and enabling

application of the OP777 in precision comparator and rectifier

circuits. This large differential voltage capability also further reduces

the need for external protection devices such as clamping diodes.

Applications for these amplifiers include both line powered and

portable instrumentation, remote sensor signal conditioning, and

precision filters.

The OP777 is specified over the extended industrial (–40

°C to

+85

°C) temperature range and is available in 8-lead MSOP and

8-lead SOIC packages. The OP777 uses a standard operational

amplifier pinout, allowing for easy drop-in replacement of lower

performance amplifiers in most circuits. Surface mount devices

in MSOP packages are available in tape and reel only.