甘肃畜牧工程职业技术学院毕业设计题目：基于51单片机的简易数字电压表的设计系部：电子信息工程系专业：信息工程技术班级：学生姓名：学号：指导老师：日期：目录毕业设计任务书............................................................................................................1开题报告........................................................................................................................2摘要.............................................................................................................................6关键词............................................................................................................................7引言..............................................................................................................................8第一章A/D转换器.......................................................................................................91．1A/D转换原理.................................................................................................91．2ADC性能参数.............................................................................................111．2．1转换精度.........................................................................................111．2．2.转换时间........................................................................................121．3常用ADC芯片概述....................................................................................13第二章8OC51单片机引脚........................................................................................14第三章ADC0809........................................................................................................163.1ADC0809引脚功能........................................................................................163.2ADC0809内部结构........................................................................................183.3ADC0809与80C51的接口............................................................................193.4ADC0809的应用指导....................................................................................203.4.1ADC0809应用说明..............................................................................203.4.2ADC0809转换结束的判断方法..........................................................203.4.3ADC0809编程方法..............................................................................21第四章硬件设计分析.................................................................................................224.1电源设计........................................................................................................224.2关于74LS02，74LS04...................................................................................224.374LS373概述.................................................................................................234.3.1引脚图..........................................................................................................234.3.2工作原理...............................................................................................234.4简易数字电压表的硬件设计.........................................................................24结论............................................................................................................................25参考文献.............
