Data Sheet
LINEAR HALL EFFECT IC AH49H
Jun. 2013 Rev. 1.2 BCD Semiconductor Manufacturing Limited
Electrical Characteristics
V
CC
=3.3V, T
A
=25°C, unless otherwise specified.
Parameter Symbol Conditions Min Typ Max Unit
Supply Current I
CC
1.2 2 3.2 mA
Quiescent Output
Voltage
V
NULL
B=0 (Gauss) 1.45 1.7 1.85 V
Output Voltage
Sensitivity
V
SEN
B=±600 (Gauss) 0.33 mV/Gauss
Output Voltage Span V
OUT S
0.85 to 2.6 V
Output Resistor R
OUT
30 50 70
Ω
Linear Magnetic Range B ±3000 Gauss
Output Noise
Bandwidth=10Hz
to 10kHz
90
μV
Transferring Characteristics (V
CC
=3.3V)
When there is no outside magnetic field (B=0Gauss),
the quiescent output voltage is one-half the supply
voltage in general.
For TO-92S-3 package, if a south magnetic pole
approaches the front face (the side with marking ID)
of the Hall effect sensor, the circuit will drive the
output voltage higher. In contrary, a north magnetic
pole will drive the output voltage lower. The
variations of voltage level up or down are
symmetrical. Because the SOT-23-3 is reversed
packaging with TO-92S-3, so the magnetic
performance is also reversed. Therefore, if the
reversed magnetic pole approaches the front face, the
output is the same as TO-92S-3 package. Greatest
magnetic sensitivity is obtained with a supply voltage
of 8V, but at the cost of increased supply current and
a slight loss of output symmetry. So, it is not
recommended to work in such condition unless the
output voltage magnitude is a main issue. The output
signal can be capacitively coupled to a next-level
amplifier for further amplifying if the changing
frequency of the magnetic field is high.
Figure 4. Transferring Characteristic of AH49H
North Pole
South Pole
For TO-92S-3 For SOT-23-3
Figure 5. Magnetic Characteristic of AH49H
