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A1357:带脉宽调制输出电流的双线式高精度线性霍尔效应传感器 IC

A1357 ECAD Model
A1357 数据表
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A1357 器件是一款带脉宽调制 (PWM) 电流的高精度可编程双线式霍尔效应线性传感器 IC。A1357 器件能通过其内置霍尔传感器元件将模拟信号转换为数字编码的 PWM 输出信号。数字编码 PWM 的耦合抗噪性远优于模拟输出信号的抗噪性。

A1357 具有 BiCMOS 单片电路，该电路集成了霍尔元件、用于降低霍尔元件固有的灵敏度和偏移漂移的高精度温度补偿电路、小型信号高增益放大器、专有动态偏移取消电路、以及 PWM 转换电路。动态偏移取消电路可减少霍尔元件的残留偏移电压,该残留偏移电压通常由器件超模压、温度依存性和热应力所致。高频偏移取消（斩波）时钟可支持更高的采样率，从而提高输出信号的精度，实现更快速的信号处理能力。

A1357 传感器采用 3 引脚单列直插式无铅封装(KB 后缀），并采用 100% 雾锡电镀引脚框。

  • 双线式输出可减少长线系统的线路成本
  • 同时对 PWM 载波频率、静态占空比(QDC)和灵敏度进行编程，优化系统
  • 全差分信号通道可增加 EMC 抗扰性，减少输出偏移漂移
  • 在工厂编程的灵敏度温度系数和静态占空比漂移
  • 下线可编程性
  • 与模拟输出相比，脉宽调制（PWM）电流输出可提供更高的抗噪性和 EMC 抗扰性
  • 温度周期性变化后具有精确的可恢复性；占空比钳位可提供短路诊断功能
  • 在器件启动时可选择 50% 占空比校准测试模式
  • 较宽的环境温度范围:-40℃ 至 150℃
  • 抗机械应力
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