AH350

AH350 Linear Hall-Effect Sensors Features - Extremely Sensitive - Flat Response to 23 KHz - Low-Noise Output - 4.5V to 6V Operation - SIP-3L and SOT23-3L Package General Description The AH350 Hall-effect sensors accurately track extremely small changes in magnetic flux density—changes are generally too small to operate Hall-effect switches. As motion detectors, gear tooth sensors, and proximity detectors, they are magnetically driven mirrors of mechanical events. As sensitive monitors of electromagnets, they can effectively measure system’s performance with negligible system loading while providing isolation from contaminated and electrically noisy environments. 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 VCC 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. www.anachip.com.tw 2/6 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) Anachip Corp. www.anachip.com.tw 3/6 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. Marking Information (1) SIP3 (Top View) 350 YWW X ID code A~Z: Non-Lead Free a~z : Lead Free Date code Y : Year WW : Nth week (2) SOT23 (Top View) ID code A~Z: Non-Lead Free a~z: Lead Free P Z: AH350 Date code Y : Year M : Month (A~L) XX YM X Anachip Corp. www.anachip.com.tw 4/6 Rev 0.1 Jan 19, 2005 AH350 Linear Hall-Effect Sensors Package Information (1) SIP-3 0.51mm NOM 2.00mm 1.15mm BRANDED SURFACE 1 2 3 Active Area Depth Sensor Location 45º 0.38mm 0.7mm 1.57mm 1.47mm 0.41mm 0.41mm 3 4.17mm 4.04mm 1.27mm 2 1 1.82 mm 45º 3.10mm 2.97mm 15.50mm 13.00mm Package Dimension Anachip Corp. www.anachip.com.tw 5/6 Rev 0.1 Jan 19, 2005 AH350 Linear Hall-Effect Sensors (2) SOT23-3L D 2 ( Sensing point ) E 0.8mm HE M 1 1.45mm 3 e1 e θ1(4x) SEE VIEW C A2 3X SEATING PLANE θ 2(4x) A 0.10 C GAUGE PLANE L θ A1 L1 b(3x) VIEW C Symbol A A1 A2 b C D E HE L L1 M e e1 θ θ1 θ2 Dimensions In Millimeters Min. 1.05 0.05 1.00 0.25 0.08 2.70 1.50 2.60 0.30 0.50 0.73 1.80 0.85 0o 3o 6o Nom. 1.10 2.90 1.60 2.80 0.60 0.78 1.90 0.95 5o 5o 8o Max. 1.35 0.15 1.20 0.50 0.20 3.00 1.70 3.00 0.55 0.70 0.83 2.00 1.05 10o 7o 10o Dimensions In Inches Min. 0.041 0.002 0.039 0.010 0.003 0.106 0.059 0.102 0.012 0.020 0.029 0.071 0.033 0o 3o 6o Nom. 0.043 0.114 0.063 0.110 0.024 0.031 0.075 0.037 5o 5o 8o Max. 0.053 0.006 0.047 0.020 0.008 0.118 0.067 0.118 0.022 0.028 0.033 0.079 0.041 10o 7o 10o Anachip Corp. www.anachip.com.tw 6/6 Rev 0.1 Jan 19, 2005