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## 3515 Datasheet(PDF) 6 Page - Allegro MicroSystems

 Part No. 3515 Description RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMPERATURE OPERATION Download 6 Pages Scroll/Zoom 100% Maker ALLEGRO [Allegro MicroSystems] Homepage http://www.allegromicro.com Logo

## 3515 Datasheet(HTML) 6 Page - Allegro MicroSystems

 6 / 6 page 3515 AND 3516RATIOMETRIC,LINEARHALL-EFFECT SENSORSwww.allegromicro.com5Ratiometry. The A3515xUA and A3516xUA feature aratiometric output. The quiescent voltage output and sensitivityare proportional to the supply voltage (ratiometric).The per cent ratiometric change in the quiescent voltageoutput is defined as∆VOQ(∆V) =VOQ(VCC) / VOQ(5V)x 100%(4)VCC / 5 Vand the per cent ratiometric change in sensitivity is defined as∆Sens(∆V) =Sens(VCC) / Sens(5V)x 100%(5)VCC / 5 VLinearity and Symmetry. The on-chip output stage is de-signed to provide a linear output to within 500 mV of either railwith a supply voltage of 5 V. This is equivalent to approxi-mately±800 gauss of ambient field. Although application ofstronger magnetic fields will not damage these devices, it willforce the output into a non-linear region. Linearity in per centis measured and defined asLin+ =VO(500G) – VOQx 100%(6)2 (VO(250G) – VOQ)Lin– =VO(-500G) – VOQx 100%(7)2 (VO(-250G) – VOQ)and output symmetry asSym =VO(500G) – VOQx 100%(8)VOQ – VO(-500G)CHARACTERISTICS DEFINITIONSQuiescent Voltage Output. In the quiescent state (no mag-netic field), the output is ideally equal to one-half of the supplyvoltage over the operating voltage and temperature range (VOQ∪ VCC/2). Due to internal component tolerances and thermalconsiderations, there is a tolerance on the quiescent voltageoutput and on the quiescent voltage output as a function ofsupply voltage and ambient temperature. For purposes ofspecification, the quiescent voltage output as a function oftemperature is defined as∆VOQ(∆T) =VOQ(TA) – VOQ(25°C)(1)Sens(25°C)This calculation yields the device’s equivalent accuracy,over the operating temperature range, in gauss.Sensitivity. The presence of a south-pole magnetic fieldperpendicular to the package face (the branded surface) willincrease the output voltage from its quiescent value toward thesupply voltage rail by an amount proportional to the magneticfield applied. Conversely, the application of a north pole willdecrease the output voltage from its quiescent value. Thisproportionality is specified as the sensitivity of the device andis defined asSens =VO(500G) – VO(-500G)(2)1000 GThe stability of sensitivity as a function of temperature isdefined as∆Sens(∆T) =Sens(TA) – Sens(25°C)x 100%(3)Sens(25°C)

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