Each Hall-effect integrated circuit includes a Hall
sensing
element,
linear
amplifier,
and
emitter-follower output stage. Having the Hall cell
and amplifier on a single chip minimizes problems
associated with handling tiny analog signals.
The device is rated for continuous operation over
the temperature range of -20°C to +85°C.
Application
- Gear tooth Sensor
- Notch Sensor
- Current Sensor
Pin Assignment
(Top View)
3. OUTPUT
2. GND
1. SUPPLY
(SIP3 package)
Pin Configuration
Name
SUPPLY
GND
OUTPUT
Description
Input power
Ground
Output stage
3. OUTPUT
GND 2.
1. SUPPLY
( SOT23 package)
Ordering Information
AH350 X - X X X
Wafer Body
Blank or
A~Z : if necessary
to specify
Package
Lead
Packing
Blank : Tube
A : Taping
L : Lead Free
P: SIP-3L
W: SOT23-3L Blank: Normal
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev. 0.1 Jan 19, 2005
1/6
AH350
Linear Hall-Effect Sensors
Block Diagram
1 V
CC
REG.
X
3 OUTPUT
2 GND
Absolute Maximum Ratings
Parameter
Supply voltage
Magnetic flux density
Operating temperature range
Storage temperature range
Symbol
Vcc
B
Top
Tstg
Rating
8
Unlimited
-20~+85
-65~+150
Unit
V
Gauss
°C
°C
Electrical Characteristics
(at Ta = 25°C, Vcc=5V)
Characteristic
Supply Voltage
Supply Current
Quiescent Output Voltage
Sensitivity
Bandwidth (-3 dB)
Broadband Output Noise
Output Resistance
Symbol
Vcc
Icc
Vout
∆Vout
BW
Vout
Rout
Conditions
Min
4.5
－
2.35
1.4
－
－
－
Typ
－
5
2.60
1.8
23
90
50
Max
6.0
9
2.85
2.2
－
－
220
Unit
V
mA
V
mV/G
kHz
µV
Ω
B=0G
B=0G to ±900G
BW=10Hz to 10kHz
All output-voltage measurements are made with a voltmeter having an input impedance of at least 10 kΩ.
measured at most sensitive area of device located 1.15mm below from top side and 2.0mm from right side.
Magnetic flux density is
Anachip Corp.
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Rev 0.1 Jan 19, 2005
AH350
Linear Hall-Effect Sensors
Typical Performance Characteristics
Output Voltage as a Function of
Temperature
Sensitivity (mV/G)
Output Voltage (V)
4.5
3.5
2.5
1.5
-40
-20
0
25
Vcc=+5V
B=+500G
B=0G
B=-500G
5
4
3
2
1
0
Device Sensitivity as a Function of
Supply Voltage
Ta= +25deg.
sensitivity
Temperature ( C)
o
85
125
4.5
Supply Voltage(V)
5
5.5
6
Supply current as a
Function of Supply Voltage
5.4
4
Output Null Voltage as a Function of
Supply Voltage
B= 0G
Ta= +25deg.
Supply current (mA)
5.2
5
4.8
4.6
4.4
4.2
4.5
Output Voltage(V)
B=0G
Ta=+25deg
3.5
3
2.5
2
1.5
1
0.5
0
Icc
Output voltage
4.5
5
5.5
6
4.7
4.9
5.1
5.3
5.5
5.7
5.9
Supply voltage(V)
Supply Voltage(V)
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Rev 0.1 Jan 19, 2005
AH350
Linear Hall-Effect Sensors
Function Descriptions
The output null voltage (B=0G) is nominally
one-half the supply voltage. A south magnetic
pole, presented to the branded face of the
Hall-effect sensor will drive the output higher than
the null voltage level. A north magnetic pole will
drive the output below the null level.
In operation, instantaneous and proportional
output-voltage levels are dependent on magnetic
flux density at the most sensitive area of the device.
Greatest sensitivity is obtained with a supply
voltage of 6V, but at the cost of increased supply
current and a slight loss of output symmetry. The
sensor’s output is usually capacitively coupled to an
amplifier that boosts the output above the millivolt
level.
In two applications shown, a permanent bias
magnet is attached with epoxy glue to the back of
the epoxy package. The presence of ferrous
material at the face of the package acts as a flux
concentrator.
The south pole of a magnet is attached to the back
of the package if the Hall-effect IC is to sense the
presence of ferrous material. The north pole of a
magnet is attached to the back surface if the
integrated circuit is to sense the absence of ferrous
material.
Calibrated linear Hall devices, which can be used to
determine the actual flux density presented to the
sensor in a particular application, are available.
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