a
FEATURES
Gain of 400. Alterable from 40 to 1000
Output Span 20 mV to (V
S
鈥?0.25) V
1 Pole Low-Pass Filtering Available
Offset Capability
Differential Input Resistance 230 k
Drives 1 k Load to +4 V Using V
S
= +5 V
Supply Voltage: +3 V to +36 V
Transient Spike Protection and RFI Filters Included
Peak Input Voltage (40 ms): 60 V
Reversed Supply Protection: 鈥?4 V
Operating Temperature Range: 鈥?0 C to +125 C
APPLICATIONS
Interface for Pressure Transducers, Position
Indicator, Strain Gages and Other Low Level Signal
Sources
IN+ 8
Single Supply Bridge
Transducer Amplifier
AD22055
FUNCTIONAL BLOCK DIAGRAM
+V
S
6
OFS
7
FILT
3
AD22055
A1
IN鈥?1
A2
5 OUT
4 GAIN
2
GND
GENERAL DESCRIPTION
The AD22055 accepts a differential signal from a bridge trans-
ducer whose common-mode signal can be anywhere between
the power supplies.
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.
+5 VOLT
V
REF
OUTPUT
8
7
6
5
IN+ OFS +V
S
OUT
AD22055
IN鈥?GND FILT GAIN
1
2
3
4
1k鈩?/div>
GAIN = 400
ANALOG
GROUND
Figure 1. Typical Application Circuit for a Pressure Sensor Interface
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.
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
漏 Analog Devices, Inc., 1997
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