Diodes AH49E - Manual (Page 6)

LINEAR HALL-EFFECT IC AH49E
Data Sheet
6
Aug. 2010 Rev. 1. 3 BCD Semiconductor Manufacturing Limited
Transfer Characteristics (V
CC
=5V)
When there is no outside magnetic field (B=0GS), the
quiescent output voltage is one-half the supply voltage
in general.
For TO-92S package, if a south magnetic pole
approches to the front face (the side with marking ID)
of the Hall effect sensor, the circuit will drive the
output voltage higher. Contrary, a north magnetic pole
will drive the output voltage lower. The variations of
voltage level up or down are symmetrical. Due to
SOT-23-3 is reversed packaging with TO-92S, so the
magnetic performance is also reversed. Therefor, if
the reversed magnetic pole approches to the front face
(the side with marking ID), the output is the same as
TO-92S package.
.
Greatest magnetic sensitivity is obtained with a supply
voltage of 6V, 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 an amplifier for
boosting further if the changing frequency of the
magnetic field is high.
1000 -1000 500 -500 0
1.0 V
2.5 V
4.0 V
Typical
Output
Voltage
V
B (Gauss)
Figure 4. The Transfer Characteristics of AH49E
South Pole North Pole
TO-92S Package SOT-23-3 Package