以 AD637 为基础的沟通毫伏表设计摘 要本设计是基于 AD637 电路的沟通数字毫伏表电路设计。该毫伏表是基于真有效值转换(True RMS-to-DC Converter)技术,以真有效值转换集成芯片 AD637 为核心,以微控制器(MCU)为量程转换控制,以高精确度四位半 A/D 转换器为模数转换,通过 LCD 显示,并辅以必要的外围电路设计而成。数字沟通毫伏表系统主要由MCU 控制模块、程控放大器模块、真有效值转换模块、电压数字显示模块等组成,并且能够根据实际沟通电压输入完成相应的量程转换功能,同时使用 LCD 显示测试电压值。该电路采纳 ICL7135 高精度、双积分 A/D 转换电路,测量范围在 0-10 伏的沟通信号,用 LCD 液晶显示。正文着重给出了软硬件系统的各部分电路,介绍了双积分电路的基本原理,89C51 最小系统的特点,ICL7135 的功能和应用,LCD1602 的功能和应用。该电路设计新颖、功能强大、可扩展性强。关键词 真有效值 数字显示 ICL7135 双积分 A/D 转换器 1602 液晶取数据数据显示处理取数据取数据切换低一级档位切换低一级档位10V 档是否合适1V 档是否合适NNYY0.1V 档是否合适TO AD637 MV BASED ON THE DESIGNOF EXCHANGEABSTRACTThe AD637 circuit design is based on the exchange of digital circuit design Millivoltmeter. The table is based on the mV RMS conversion (True RMS-to-DC Converter) technology to TRMS AD637 converter chip as the core, microcontroller (MCU) for the change of control of range, high precision 4 half A / D converter for analog-to-digital conversion, through the LCD display, supplemented by the necessary from the external circuit design. Digital AC millivolt meter system mainly by the MCU control module, program-controlled amplifier module, True RMS conversion module, voltage digital display module, such as composition,And can in accordance with the actual AC voltage input range corresponding to complete conversion, at the same time using the LCD display test voltage value.ICL7135 precision of the circuit, double-integrating A / D conversion circuit, surveying the...