The A1230 is a dual-channel, bipolar switch with two Hall-effect sensing elements, each providing a separate digital output for speed and direction signal processing capability. The Hall elements are photolithographically aligned to better than 1 µm. Maintaining accurate mechanical location between the two active Hall elements eliminates the major manufacturing hurdle encountered in fine-pitch detection applications. The A1230 is a highly sensitive, temperature stable magnetic sensing device ideal for use in ring magnet based, speed and direction systems located in harsh automotive and industrial environments.
The A1230 monolithic integrated circuit (IC) contains two independent Hall-effect bipolar switches located 1 mm apart. The digital outputs are out of phase so that the outputs are in quadrature when interfaced with the proper ring magnet design. This allows easy processing of speed and direction signals. Extremely low-drift amplifiers guarantee symmetry between the switches to maintain signal quadrature. The Allegro patented, high-frequency chopper-stabilization technique cancels offsets in each channel providing stable operation over the full specified temperature and voltage ranges.
Additionally, the high-frequency chopping circuits allow an increased analog signal-to-noise ratio at the input of the digital comparators internal to the IC. As a result, the A1230 achieves industry-leading digital output jitter performance that is critical in high performance motor commutation applications. An on-chip low dropout (LDO) regulator allows the use of this device over a wide operating voltage range. Post-assembly factory programming at Allegro provides sensitive switchpoints that are symmetrical between the two switches.
The A1230 is available in a plastic 8-pin SOIC surface mount package (L) and a plastic 4-pin SIP (K). Both are available in a temperature range of –40°C to 150°C. Each package is lead (Pb) free, with 100% matte tin plated leadframe.
A1230: 超灵敏双通道正交霍尔效应双极开关
A1230 是一款双通道双极开关，该开关带有两个霍尔效应传感元件，每个元件都可为速度和方向信号处理提供独立的数字输出。霍尔元件均采用光学平版印刷，校准精度超过 1 µm。保持两个活动霍尔元件之间精确的机械位置可消除小口距测向应用中遇到的主要制造困难。A1230 是高灵敏、温度稳定的磁性感测器件，是在严苛的汽车和工业环境下用于感测环形磁铁速度和方向系统的理想之选。
A1230 单片集成电路 (IC) 包含两个独立的霍尔效应双极开关，两个开关间相距 1 mm。数字输出异相，因此，当与适当的环形磁铁设计交互时，输出形成正交。这可实现速度和方向信号的简易处理。漂移极低的放大器确保开关之间的对称，以保持信号正交。Allegro® 已获专利的稳定斩波技术可消除每一通道的偏移，在整个指定的工作温度和电压范围内实现稳定操作。
此外，高频斩波电路还可在 IC 内部数字比较器输入的条件下实现更高的模拟信号杂讯比。这样，A1230 可实现业界领先的数字输出抖动性能，这对于高性能电动机换向应用至为关键。芯片低压差线性稳压器允许该器件在较宽的工作电压范围内使用。组装后出厂编程可确保两开关之间相对称的灵敏开关点。
A1230 采用塑料 8 管脚 SOIC 表面安装封装 (L) 和塑料 4 管脚 SIP (K)。两种封装均可用于 –40°C 至 150°C 的温度范围。每种封装都是无铅封装，引脚框采用 100% 雾锡电镀。
