REV. D

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a

OP497

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

Precision Picoampere Input Current

Quad Operational Amplifier

FEATURES

Low Offset Voltage: 50

V max

Low Offset Voltage Drift: 0.5

V/ C max

Very Low Bias Current

25 C: 100 pA max

–55 C to +125 C: 450 pA max

Very High Open-Loop Gain: 2000 V/mV min

Low Supply Current (per Amplifier): 625

A max

Operates from

2 V to

20 V Supplies

High Common-Mode Rejection: 120 dB min

APPLICATIONS

Strain Gage and Bridge Amplifiers

High Stability Thermocouple Amplifiers

Instrumentation Amplifiers

Photo-Current Monitors

High Gain Linearity Amplifiers

Long-Term Integrators/Filters

Sample-and-Hold Amplifiers

Peak Detectors

Logarithmic Amplifiers

Battery-Powered Systems

GENERAL DESCRIPTION

The OP497 is a quad op amp with precision performance in the

space-saving, industry standard 16-lead SOlC package. Its com-

bination of exceptional precision with low power and extremely

low input bias current makes the quad OP497 useful in a wide

variety of applications.

Precision performance of the OP497 includes very low offset,

under 50

µV, and low drift, below 0.5 µV/°C. Open-loop gain

exceeds 2000 V/mV ensuring high linearity in every application.

Errors due to common-mode signals are eliminated by the OP497’s

common-mode rejection of over 120 dB. The OP497’s power

supply rejection of over 120 dB minimizes offset voltage changes

experienced in battery-powered systems. Supply current of the

OP497 is under 625

µA per amplifier, and it can operate with

supply voltages as low as

±2 V.

The OP497 utilizes a superbeta input stage with bias current can-

cellation to maintain picoamp bias currents at all temperatures.

This is in contrast to FET input op amps whose bias currents start

in the picoamp range at 25

°C, but double for every 10°C rise in

temperature, to reach the nanoamp range above 85

°C. Input bias

current of the OP497 is under 100 pA at 25

°C and is under 450

pA over the military temperature range.

Combining precision, low power, and low bias current, the

OP497 is ideal for a number of applications, including instru-

mentation amplifiers, log amplifiers, photo-diode preamplifiers,

and long-term integrators. For a single device, see the OP97; for a

dual device, see the OP297.

PIN CONNECTIONS

16-Lead Wide Body SOIC

(S-Suffix)

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

–

+

NC = NO CONNECT

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

NC

NC

–

+

OP497

14-Lead Plastic Dip

(P-Suffix)

14-Lead Ceramic Dip

(Y-Suffix)

1

2

3

4

5

6

7

14

13

12

11

10

9

8

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

–

+

–

+

OP497

15V

1000

100

10

–75

–50

–25

0

25

50

75

100

125

TEMPERATURE – C

Input Bias, Offset Current vs. Temperature