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A1326 Datasheet(PDF) 6 Page - Allegro MicroSystems |
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A1326 Datasheet(HTML) 6 Page - Allegro MicroSystems |
6 / 12 page Linear Hall Effect Sensor ICs with Analog Output A1324, A1325, and A1326 6 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com TA = 25°C, and Sens(25°C)1 is the value of sensitivity at TA = 25°C after temperature cycling TA up to 150°C, down to –40°C, and back to up 25°C. Linearity Sensitivity Error The 132x is designed to provide linear output in response to a ramping applied magnetic field. Consider two magnetic fields, B1 and B2. Ideally the sensitivity of a device is the same for both fields for a given supply voltage and temperature. Linearity sensitivity error is present when there is a difference between the sensitivities measured at B1 and B2. Linearity Sensitivity Error is calculated separately for the positive (LINERR+) and negative (LINERR–) applied magnetic fields. Lin- earity Sensitivity Error (%) is measured and defined as: SensB(++) SensB(+) 1– LinERR+ = ×100% SensB(– –) SensB(–) 1– LinERR– = ×100% (7) and LinERR = max(|LinERR+| , |LinERR–| ) (8) where: |VOUT(Bx) – VOUT(Q)| BX SensBx = (9) and B(++), B(+), B(– –), and B(–) are positive and negative mag- netic fields with respect to the quiescent voltage output such that |B(++)| > |B(+)| and |B(– –)| > |B(– )| . Symmetry Sensitivity Error The magnetic sensitivity of a device is constant for any two applied magnetic fields of equal magnitude and opposite polarities. Symmetry Error (%), is measured and defined as: SensB(+) SensB(–) 1– SymERR = ×100% (11) where SensBx is defined as in equation 9, and B(+), B(–) are posi- tive and negative magnetic fields such that |B(+)| = |B(–)|. Ratiometry Error The A132x features a ratiometric output. This means that the quiescent voltage output, VOUT(Q), magnetic sensitivity, Sens, and clamp voltages, VCLPHIGH and VCLPLOW, are proportional to the supply voltage, VCC. In other words, when the supply voltage increases or decreases by a certain percent- age, each characteristic also increases or decreases by the same percentage. Error is the difference between the measured change in the supply voltage, relative to 5 V, and the measured change in each characteristic. The ratiometric error in quiescent voltage output, RatVOUT(Q) (%), for a given supply voltage, VCC, is defined as: VOUT(Q)VCC VOUT(Q)5V VCC V 1– RatVOUT(Q) = ×100% (12) The ratiometric error in magnetic sensitivity, RatSENS (%), for a given supply voltage, VCC, is defined as: SensVCC Sens5V VCC V 1– RatVOUT(Q) = ×100% (13) |
Similar Part No. - A1326 |
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Similar Description - A1326 |
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