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 V
CC
APPLICATIONS
Automotive
Throttle Position Sensing
Pedal Position Sensing
Suspension Position Sensing
Valve Position Sensing
Industrial
Absolute Position Sensing
Proximity Sensing
FUNCTIONAL BLOCK DIAGRAM
V
CC
/2
TEMP REF
OUT AMP
REF
AD22151
I
SOURCE
SWITCHES
DEMOD
V
CC
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 鈥?0鈭濩 to +150鈭濩. 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.
GND
NC
R1
R2
0.1 F
R3
OUTPUT
NC = NO CONNECT
AD22151
Figure 1. Typical Bipolar Configuration with Low
(< 鈥?00 ppm) Compensation
V
CC
R1
R4
NC
R2
0.1 F
R3
OUTPUT
GND
NC = NO CONNECT
AD22151
Figure 2. Typical Unipolar Configuration with
High ( 鈥?000 ppm) Compensation
REV. A
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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
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