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A1360_V Datasheet(PDF) 11 Page - Allegro MicroSystems |
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A1360_V Datasheet(HTML) 11 Page - Allegro MicroSystems |
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11 / 26 page 
A1360, A1361, and A1362 Guaranteed Sensitivity Range The magnetic sensitivity, Sens, can be programmed around its nominal value, 0.7 to 16 mV/G depending on device type, within the sensitivity range limits: Sens(min) and Sens(max). Refer to the Guaranteed Quiescent Voltage Output Range section for a conceptual explanation of how value distributions and ranges are related. Average Sensitivity Step Size Refer to the Average Quiescent Voltage Output Step Size section for a conceptual explanation. Sensitivity Programming Resolution Refer to the Quiescent Voltage Output Programming Resolution section for a conceptual explanation. Sensitivity Temperature Coefficient Device sensitivity changes as temperature changes, with respect to its programmed sensitiv- ity temperature coefficient, TCSENS. TCSENS is programmed at 150°C, and calculated relative to the nominal sensitivity program- ming temperature of 25°C. TCSENS (%/°C) is defined as: Sens T2 – SensT1 Sens T1 T2–T1 1 TC Sens = ×100% , ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ (6) where T1 is the nominal Sens programming temperature of 25°C, and T2 is the TCSENS programming temperature of 150°C. The ideal value of Sens over the full ambient temperature range, SensEXPECTED(TA), is defined as: Sens T1 [1 + TCSENS (TA –T1) / 100%] Sens EXPECTED(TA) = (7) SensEXPECTED(TA) should be calculated using the actual measured values of SensT1 and TCSENS rather than programming target values. Sensitivity Drift Due to Package Hysteresis Package stress and relaxation can cause the device sensitivity at TA = 25°C to change during and after temperature cycling. For purposes of specification, the sensitivity drift due to package hysteresis, ∆SensPKG, is defined as: Sens (25°C)2 – Sens(25°C)1 Sens (25°C)1 ∆Sens PKG = ×100% , (8) where Sens(25°C)1 is the programmed value of sensitiv- ity at TA = 25°C, and Sens(25°C)2 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 136x family is designed to provide a linear output in response to a ramping applied magnetic field. Consider two magnetic fields, B1 and B2. Ideally, the sen- sitivity of a device is the same for both fields, for a given supply voltage and temperature. Linearity error is present when there is a difference between the sensitivities measured at B1 and B2. Linearity Error is calculated separately for the positive (LinERRPOS) and negative (LinERRNEG) applied magnetic fields. Linearity error (%) is measured and defined as: Sens BPOS2 Sens BPOS1 Sens BNEG2 Sens BNEG1 1– Lin ERRPOS = ×100% , ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ 1– Lin ERRNEG = ×100% , ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ (9) where: |V OUT(Bx) – VOUT(Q)| Bx Sens Bx = , (10) and BPOSx and BNEGx are positive and negative magnetic fields, with respect to the quiescent voltage output such that |BPOS2| = 2 ×|BPOS1| and |BNEG2| = 2 ×|BNEG1|. Then: Lin ERR max( LinERRPOS , LinERRNEG) = . (11) Note that unipolar devices only have positive linearity error, LinERRPOS. Low-Noise Programmable Linear Hall Effect Sensor ICs with Adjustable Bandwidth (50 kHz Maximum) and Analog Output 11 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com |
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