0～100mV精密电压源的设计与仿真  

Design and simulation of 0～100mV precision voltage source

作　　者：王东锋[1] 黎映相 

机构地区：[1]空军第一航空学院,河南信阳464000 [2]天利航空科技公司,广东深圳518172

出　　处：《微型机与应用》2012年第10期31-33,共3页Microcomputer & Its Applications

摘　　要：基于16bit高精度D/A转换器AD5422和高精度放大器LM2902设计了以AT89S51单片机为主控芯片的0～100mV精密电压源。输出电压的反馈控制采用16bitA/D转换器LTC1865,显示器为1602LCD;系统的控制软件采用C语言设计。结果表明,系统的输出信号偏移量ΔUomax≤0.02mV,最大输出驱动电流可达20mA,设计成本和体积相比传统设计显著降低,可很好地满足使用要求。On the basis of 16 bit high precision D/A converter part and high precision amplifier LM2902, the precision voltage source（0-100mV） whose main control single chip is AT89S51 is designed. The 16 bit A/D chip is used to conduct feedback con- trol and the system＇s display is 1602LCD. Meanwhile, the system＇s control soft is designed by C language. Results show that, the system＇s output precision is ~lO/~V and its maximus output driving current is 20 mA. By contrast with traditional design, the design cost and the volume of this system decreases evidently, so that it can satisfy the requirement well.

关 键 词：精密电压源 AD5422 LTC1865 PROTEUS仿真 

分 类 号：TP312[自动化与计算机技术—计算机软件与理论] TP391.9[自动化与计算机技术—计算机科学与技术]