A1425LK-T

• Product Introduction

The A1425 AC-coupled Hall-effect sensor IC is a monolithic integrated circuit that switches and switches in response to a rotating ring magnet and a changing differential magnetic field when a ferrous target is coupled to a magnet. The device is a true zero cross detector: the output performs precise switching when the difference in magnetic field strength between the two Hall elements is zero. The unique dual comparator solution uses hysteresis to prevent false switching while providing precise switching at the zero intersection of the differential signal positive and negative in both regions. The device's zero-crossover feature provides perfect repeatability and accuracy for shaft applications.

Changes in magnetic field strength on the device surface caused by moving targets can be sensed by two integrated Hall sensors. The sensor generates a signal that can be differentially amplified by the chip's electronics. The differential design resists radial vibration by rejecting this common-mode signal within the operating air gap range of the A1425. Steady-state magnets and system offsets can be eliminated using chip differential bandpass filters. The filter also provides relative protection against interference from electromagnetic sources.

The device utilizes the advanced temperature compensation of high-pass filters, sensitivity, and Schmitt flip-flop switches to ensure optimal operation at low frequencies over a wide air gap and temperature range.

Each Hall-effect digital integrated circuit includes a voltage regulator, two Hall-effect sensing elements, temperature compensation circuitry, a low-level amplifier, bandpass filter, Schmitt flip-flop, and output driver (pull-up resistor required). The board regulator allows operation from a supply voltage of 4.0 to 26.5 V. The output stage can be easily turned up to 20 mA over the full frequency response range of the device and is compatible with TTL and CMOS logic circuitry.

The device is available in a 4-pin plastic single-row in-line package (SIP). They are all lead-free and 100% matte tin plated.

• 环形磁铁或亚铁目标的感测运动
• 集成滤波电容器
• 较宽的工作温度范围
• 在磁性输入信号频率为 20 赫 到 20 千赫条件下可操作
• 抗电磁干扰 (EMI)
• 较大的有效气隙
• 4.0 至 26.5 V 电源电压范围
• 与 TTL 和 CMOS 逻辑系列均兼容的输出
• 反向电池保护
• 抗机械和热应力
• 精确的真零点交叉开关点
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