Diodes AH49H Manuel d'utilisateur télécharger pdf (Page 5)

Data Sheet

LINEAR HALL EFFECT IC AH49H

Jun. 2013 Rev. 1.2 BCD Semiconductor Manufacturing Limited

Electrical Characteristics

=3.3V, T

=25°C, unless otherwise specified.

Parameter Symbol Conditions Min Typ Max Unit

Supply Current I

1.2 2 3.2 mA

Quiescent Output

Voltage

NULL

B=0 (Gauss) 1.45 1.7 1.85 V

Output Voltage

Sensitivity

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

Linear Magnetic Range B ±3000 Gauss

Output Noise

Bandwidth=10Hz

to 10kHz

μV

Transferring Characteristics (V

=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

1 2 3 4 5 6 7 8 9 10

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Diodes AH49H Manuel d'utilisateur Page 5

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