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A3507EUA Datasheet(PDF) 5 Page - Allegro MicroSystems |
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A3507EUA Datasheet(HTML) 5 Page - Allegro MicroSystems |
5 / 8 page 3507 AND 3508 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMP. OPERATION www.allegromicro.com SENSOR LOCATION APPLICATIONS INFORMATION Calibrated linear Hall devices, which can be used to determine the actual flux density presented to the sensor in a particular application, are available. For safe, reliable operation, the output should not be pulled above the supply voltage or pulled below the device ground. For optimum performance, a 100 pF capacitor between the output and ground should be added. The nominal sensitivity is factory set to compensate for the temperature coefficient of samarium-cobalt magnets (-0.02%/ °C). The ratiometric feature is especially valuable when these devices are used with an analog-to-digital converter. A/D converters typically derive their LSB step size by ratioing off a reference voltage line. If the reference voltage varies, the LSB will vary proportionally. This is a major error source in many sensing systems. The A3507/08– can eliminate this source of error by their ratiometric operation. Because their gain and offsets are proportional to the supply voltage, if they are powered from the A/D reference voltage, the sensor output voltage will track changes in the LSB value. Hall-effect applications information is available in the application note “Linear Hall-Effect Sensors” (AN 27702), which can be found in the latest issue of Allegro Electronic Data Book, AMS-702, or at www.allegromicro.com 1 3 2 Dwg. MH-011-6A 0.018" 0.46 mm NOM BRANDED SURFACE ACTIVE AREA DEPTH 0.082" 2.07 mm 0.055" 1.40 mm A B ≈ N x 6.9 G/A Dwg. AH-005A TYPICAL CURRENT-SENSING APPLICATION |
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