FUNCTIONAL BLOCK DIAGRAM

AD22055

OUT

GAIN

IN+

IN–

OFS

FILT

A1

8

1

7

3

2

A2

4

5

6

GND

REV. 0

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.

a

Single Supply Bridge

Transducer Amplifier

AD22055

FEATURES

Gain of 400. Alterable from 40 to 1000

1 Pole Low-Pass Filtering Available

Offset Capability

Differential Input Resistance 230 k

Drives 1 k

Supply Voltage: +3 V to +36 V

Transient Spike Protection and RFI Filters Included

Peak Input Voltage (40 ms): 60 V

Reversed Supply Protection: –34 V

Operating Temperature Range: –40 C to +125 C

APPLICATIONS

Interface for Pressure Transducers, Position

Indicator, Strain Gages and Other Low Level Signal

Sources

GENERAL DESCRIPTION

The AD22055 accepts a differential signal from a bridge trans-

ducer whose common-mode signal can be anywhere between

the power supplies.

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

Tel: 617/329-4700

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

Fax: 617/326-8703

© Analog Devices, Inc., 1997

The extended temperature range allows for local signal condi-

tioning for oil and hydraulic pressure sensors as well as other

automotive sensors.

The use of an external gain resistor allows the user to compen-

sate transducer gain error and temperature drift.

AD22055

IN– GND FILT GAIN

123

4

5

6

7

8

1k

Ω

+5 VOLT

OUTPUT

ANALOG

GROUND

GAIN = 400

Figure 1. Typical Application Circuit for a Pressure Sensor Interface