CONNECTION DIAGRAM

8-Lead Plastic Mini-DIP (N)

and SOIC (SO) Packages

1

2

3

4

8

7

6

5

AD626

1/6

200k

–IN

ANALOG

GND

FILTER

+IN

G = 100

OUT

100k

G = 2

G = 30

200k

REV. C

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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

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

otherwise under any patent or patent rights of Analog Devices.

a

Low Cost, Single Supply

Differential Amplifier

AD626

FEATURES

Pin Selectable Gains of 10 and 100

True Single Supply Operation

Single Supply Range of +2.4 V to +10 V

Dual Supply Range of

1.2 V to

6 V

Wide Output Voltage Range of 30 mV to 4.7 V

Optional Low-Pass Filtering

Excellent DC Performance

Low Input Offset Voltage: 500

V max

Large Common-Mode Range: 0 V to +54 V

Good CMR of 90 dB typ

AC Performance

Fast Settling Time: 24

s (0.01%)

Includes Input Protection

RFI Filters Included

Allows 50 V Continuous Overload

APPLICATIONS

Current Sensing

Interface for Pressure Transducers, Position Indicators,

Strain Gages, and Other Low Level Signal Sources

PRODUCT DESCRIPTION

The AD626 is a low cost, true single supply differential ampli-

fier designed for amplifying and low-pass filtering small differen-

tial voltages from sources having a large common-mode voltage.

The AD626 can operate from either a single supply of +2.4 V to

+10 V, or dual supplies of

±1.2 V to ±6 V. The input common-

provides a +24 V CMR while operating from a +5 V supply.

Furthermore, the AD626 features a CMR of 90 dB typ.

The amplifier’s inputs are protected against continuous overload

of up to 50 V, and RFI filters are included in the attenuator

network. The output range is +0.03 V to +4.9 V using a +5 V

supply. The amplifier provides a preset gain of 10, but gains be-

tween 10 to 100 can be easily configured with an external resis-

tor. Furthermore, a gain of 100 is available by connecting the G

= 100 pin to analog ground. The AD626 also offers low-pass

filter capability by connecting a capacitor between the filter pin

and analog ground.

The AD626A and AD626B operate over the industrial tempera-

ture range of –40

°C to +85°C. The AD626 is available in two

8-lead packages: a plastic mini-DIP and SOIC.

160

0

1M

60

20

1

40

0.1

140

80

100

100k

10k

1k

100

10

FREQUENCY – Hz

G = 10,100

G = 100

G = 10

Common-Mode Rejection vs. Frequency

25

0

5

15

5

2

10

1

20

4

3

POWER SUPPLY VOLTAGE –

Volts

AND DUAL SUPPLIES

SUPPLIES ONLY

Input Common-Mode Range vs. Supply

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., 1999