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A1425LK-T Datasheet(PDF) 11 Page - Allegro MicroSystems |
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A1425LK-T Datasheet(HTML) 11 Page - Allegro MicroSystems |
11 / 13 page High Accuracy Analog Speed Sensor IC with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal A1425 11 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Target Selection The zero-crossing switchpoints and AC-coupled operation of this device make target selection important. For high-density target geometries or small target features that produce a sinusoidal magnetic signal, the high-pass filter is capable of filtering offsets that may be induced in the final device output. If such offset is present, and the target has larger features, then the high-pass filter may not be effective at higher speeds and an accuracy shift may occur. These relationships are shown in figure 2. Power Supply Protection The A1425 contains an on-chip voltage regulator and can oper- ate over a wide supply voltage range. In applications that operate the device from an unregulated power supply, transient protec- tion must be added externally. For applications using a regulated line, EMI/RFI protection may still be required. The circuit shown in figure 3 is the most basic configuration required for proper device operation. Applications Information 2 1 3 (Required) 4 V OUT 0.1 uF R PU VCC A1425 Figure 3. Basic application circuit. A pull-up resistor, RPU, is required with the output driver. +B +V 0 0 0 –B t +B Output Edge Shift +V 0 –B t Valley Large Feature (Tooth) Figure 2. Large Feature Effects. (a) Large target feature but no device offset, normal edge position. (b) Large target feature with negative device offset, shifted (advanced) output edge position. (a) (b) |
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