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AD22151 Datasheet

Linear Output Magnetic Field Sensor

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Linear Output
Magnetic Field Sensor
AD22151
FEATURES
Adjustable Offset to Unipolar or Bipolar Operation
Low Offset Drift over Temperature Range
Gain Adjustable over Wide Range
Low Gain Drift over Temperature Range
Adjustable First Order Temperature Compensation
Ratiometric to VCC
APPLICATIONS
Automotive
Throttle Position Sensing
Pedal Position Sensing
Suspension Position Sensing
Valve Position Sensing
Industrial
Absolute Position Sensing
Proximity Sensing
GENERAL DESCRIPTION
The AD22151 is a linear magnetic field transducer. The sensor
output is a voltage proportional to a magnetic field applied
perpendicularly to the package top surface.
The sensor combines integrated bulk Hall cell technology and
instrumentation circuitry to minimize temperature related drifts
associated with silicon Hall cell characteristics. The architecture
maximizes the advantages of a monolithic implementation while
allowing sufficient versatility to meet varied application require-
ments with a minimum number of components.
Principal features include dynamic offset drift cancellation
and a built-in temperature sensor. Designed for single 5 V
supply operation, the AD22151 achieves low drift offset and
gain operation over –40C to +150C. Temperature compensa-
tion can accommodate a number of magnetic materials commonly
utilized in economic position sensor assemblies.
The transducer can be configured for specific signal gains to
meet various application requirements. Output voltage can be
adjusted from fully bipolar (reversible) field operation to fully
unipolar field sensing.
The voltage output achieves near rail-to-rail dynamic range,
capable of supplying 1 mA into large capacitive loads. The
signal is ratiometric to the positive supply rail in all configurations.
FUNCTIONAL BLOCK DIAGRAM
VCC/2
TEMP REF
AD22151
ISOURCE
REF
OUT AMP
SWITCHES
DEMOD
NC
R1
VCC
R2
0.1F
R3
OUTPUT
GND
NC = NO CONNECT
AD22151
Figure 1. Typical Bipolar Configuration with Low
(< –500 ppm) Compensation
VCC
R1
R4
NC
R2
0.1F
R3
OUTPUT
REV. A
GND
NC = NO CONNECT
AD22151
Figure 2. Typical Unipolar Configuration with
High (Ϸ –2000 ppm) Compensation
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
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 © 2003 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD22151 Datasheet

Linear Output Magnetic Field Sensor

No Preview Available !

AD22151–SPECIFICATIONS (TA = 25؇C and V+ = 5 V, unless otherwise noted.)
Parameter
OPERATION
VCC Operating
ICC Operating
INPUT
TC3 (Pin 3) Sensitivity/Volt
Input Range1
OUTPUT2
Sensitivity (External Adjustment, Gain = +1)
Linear Output Range
Output Min
Output Max (Clamp)
Drive Capability
Offset @ 0 Gauss
Offset Adjust Range
Output Short Circuit Current
ACCURACIES
Nonlinearity (10% to 90% Range)
Gain Error (Over Temperature Range)
Offset Error (Over Temperature Range)
Uncompensated Gain TC (GTCU)
RATIOMETRICITY ERROR
3 dB ROLL-OFF (5 mV/G)
OUTPUT NOISE FIGURE (6 kHz BW)
PACKAGE
OPERATING TEMPERATURE RANGE
NOTES
1–40C to +150C.
2RL = 4.7 kW.
Specifications subject to change without notice.
Min
4.5
10
5.0
–40
Typ
5.0
6.0
160
VCC
2
± 0.5
0.4
5.0
93
1.0
VCC
2
5.0
0.1
±1
± 6.0
950
5.7
2.4
8-Lead SOIC
Max
6.0
10
90
95
1.0
+150
Unit
V
mA
mV/G/V
V
mV/G
% of VCC
% of VCC
% of VCC
mA
V
% of VCC
mA
% FS
%
G
ppm
%V/VCC
kHz
mV/rms
C
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 V
Package Power Dissipation . . . . . . . . . . . . . . . . . . . . . . 25 mW
Storage Temperature . . . . . . . . . . . . . . . . . . . –50C to +160C
Output Sink Current, IO . . . . . . . . . . . . . . . . . . . . . . . . 15 mA
Magnetic Flux Density . . . . . . . . . . . . . . . . . . . . . . Unlimited
Lead Temperature (Soldering 10 sec) . . . . . . . . . . . . . . 300C
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to the absolute maximum
rating conditions for extended periods may affect device reliability.
ORDERING GUIDE
Model
Temperature Package Package
Range
Description Option
AD22151YR
–40C to +150C 8-Lead SOIC R-8
AD22151YR-REEL –40C to +150C 8-Lead SOIC R-8
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
AD22151 features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended
to avoid performance degradation or loss of functionality.
–2– REV. A


Part Number AD22151
Description Linear Output Magnetic Field Sensor
Maker Analog Devices
Total Page 8 Pages
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