ad647k Analog Devices, Inc., ad647k Datasheet

ad647k

Manufacturer Part Number

ad647k

Description

Ultralow Drift, Dual Bifet Op Amp

Manufacturer

Analog Devices, Inc.

Datasheet

1.AD647K.pdf (6 pages)

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BOSTOCK HK LIMITED

Part Number:

ad647kH

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ADI

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572

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REV. A

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

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

otherwise under any patent or patent rights of Analog Devices.

PRODUCT DESCRIPTION

The AD647 is an ultralow drift, dual JFET amplifier that com-

bines high performance and convenience in a single package.

The AD647 uses the most advanced ion-implantation and laser

wafer drift trimming technologies to achieve the highest perfor-

mance currently available in a dual JFET. Ion-implantation per-

mits the fabrication of matched JFETs on a monolithic bipolar

chip. Laser wafer drift trimming trims both the initial offset volt-

age and its drift with temperature to provide offsets as low as

100 V (250 V max) and drifts of 2.5 V/ C max.

In addition to outstanding individual amplifier performance, the

AD647 offers guaranteed and tested matching performance on

critical parameters such as offset voltage, offset voltage drift and

bias currents.

The high level of performance makes the AD647 especially well

suited for high precision instrumentation amplifier applications

that previously would have required the costly selection and

matching of space wasting single amplifiers.

The AD647 is offered in four performance grades, three com-

mercial (the J, K and L) and one extended (the S). All are sup-

plied in hermetically sealed 8-pin TO-99 packages and are

available processed to MIL-STD-883B. The LCC version is

also available processed to MIL-STD-883B.

FEATURES

Low Offset Voltage Drift

Matched Offset Voltage

Matched Offset Voltage Over Temperature

Matched Bias Currents

Crosstalk: –124 dB at 1 kHz

Low Bias Current: 35 pA max Warmed Up

Low Offset Voltage: 250 V max

Low Input Voltage Noise: 2 V p-p

High Open Loop Gain: 108 dB

Low Quiescent Current: 2.8 mA max

Low Total Harmonic Distortion

Standard Dual Amplifier Pinout

Available in Hermetic Metal Can Package, Hermetic

MIL-STD-883B Processing Also Available

Single Version Available: AD547

Surface Mount (20-Pin LCC) and Chip Form

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

Tel: 617/329-4700

PRODUCT HIGHLIGHTS

1. The AD647 is guaranteed and tested to tight matching speci-

2. Laser wafer drift trimming reduces offset voltage and offset

3. Voltage noise is guaranteed at 4 V p-p max (0.1 Hz to

4. Bias current (35 pA K, L, S; 75 pA J) is specified after five

5. Total supply current is a low 2.8 mA max.

6. High open loop gain ensures high linearity in precision instru-

7. The standard dual amplifier pinout permits the direct substi-

8. The AD647 is available in chip form.

fications to ensure high performance and to eliminate the se-

lection and matching of single devices.

voltage drifts to 250 V and 2.5 V/ C max.

10 Hz) on K, L and S grades.

minutes of operation.

mentation amplifier applications.

tution of the AD647 for lower performance devices.

Dual BiFET Op Amp

Ultralow Drift,

AD647

Fax: 617/326-8703

Related parts for ad647k

ad647k Summary of contents

Page 1

FEATURES Low Offset Voltage Drift Matched Offset Voltage Matched Offset Voltage Over Temperature Matched Bias Currents Crosstalk: –124 kHz Low Bias Current max Warmed Up Low Offset Voltage: 250 V max Low Input Voltage ...

Page 2

... AD647KH = + +25 C. For higher temperatures, the current doubles every METALIZATION PHOTOGRAPH Dimensions shown in inches and (mm). Contact factory for latest dimensions. –2– AD647L AD647S Min Typ Max Min Typ Max ...

Page 3

REV. A Typical Characteristics–AD647 –3– ...

Page 4

AD647 –4– REV. A ...

Page 5

APPLICATION NOTES The AD647 is fully specified under actual operating conditions to insure high performance in any application, but there are some steps that will improve on even this high level of performance. The bias current of a JFET amplifier ...

Page 6

AD647 The picoamp level input current and low offset voltage of the AD647 make it suitable for wide dynamic range log amplifiers. Figure schematic of a log ratio circuit employing the AD647 that can achieve less than ...

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