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AH49E Datasheet(PDF) 5 Page - BCD Semiconductor Manufacturing Limited |
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AH49E Datasheet(HTML) 5 Page - BCD Semiconductor Manufacturing Limited |
5 / 8 page ![]() 5 Jun. 2008 Rev. 1. 1 BCD Semiconductor Manufacturing Limited LINEAR HALL-EFFECT IC AH49E Preliminary Datasheet (VCC=5V, TA=25 oC, unless otherwise specified.) Parameter Symbol Conditions Min Typ Max Unit Supply Current ICC 3.5 4.5 mA Quiescent Output Voltage VNULL @ B=0GS 2.25 2.5 2.75 V Output Voltage Sensitivity B=0GS to ±1000GS 1.1 1.6 2.1 mV/GS Output Voltage Span VOS 1.0 to (VCC-1.0) 0.8 to (VCC-0.8) V Output Resistor RO 60 120 Ω Magnetic Field Range B ±650 ±1000 GS Linearity of Span 0.7 % Output Noise BW=10Hz to 10kHz 90 µV Electrical Characteristics Transfer Characteristics (VCC=5V) When there is no ouside magnetic field (B=0GS), the quiescent output voltage is one-half the supply voltage in general. If a south magnetic pole approches to the front face (the side with marking ID) of the Halleffect 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. 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 |
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