模数转换器AD7864及在光电轴角编码器中的应用  

Analogy/Digital Converter AD7864 and Its Applications in Interpolation of Photoelecrtical Rotary Encoder

作　　者：于浩成[1] 朱喜林[1] 卢川英[2] 

机构地区：[1]吉林大学机械科学与工程学院,吉林长春130025 [2]吉林交通职业技术学院,吉林长春130012

出　　处：《仪表技术与传感器》2006年第6期40-41,44,共3页Instrument Technique and Sensor

摘　　要：介绍了模数转换器AD7864芯片特性、时序和数据转换工作过程原理。模数转换器AD7864的1个转换周期只需要1.65μs,所以非常适合应用在光电轴角编码器中,采用20 MHz晶振频率的16位80C196KC微处理器来提高编码器运行速度,同时介绍其与80C196KC单片机硬件接口电路和在编码器中的莫尔条纹细分的软件设计流程,最后阐述其在光电轴角编码器的应用结论和转换开始后输入信号和跟踪/保持信号的时序图的应用结论。Introduced the chip feature, timings, data-convert process and principle of AD7864. The AD7864 chip is a complete analog signal processor for the interpolation in the photoelectrical rotary encoder and it only need 1.65μs in a completed A/D convert. Meanwhile, adopted 16-bit microprocessor 80C196KC with 20 MHz crystal frequency to improve encoder speed. Then introduced the AD7864 interface circuits with 80C196KC and the software design flowing at the fractionized applications of Moire fringe signal. Finally, discussed the application conclusions for the interpolation in the photoelectrical rotary encoder and the timimg diagram of the input signal and track/hold after convert start after the AID converter.

关 键 词：模数转换器 光电轴角编码器 单片机 莫尔条纹 

分 类 号：TP335.1[自动化与计算机技术—计算机系统结构]