电子信息工程课程设计--基于单片机的波形发生器.docVIP

波形发生器设计与总结报告 摘 要：本设计是基于信号发生芯片MAX038的多功能波形发生器。由MAX038、D\A转换，MAX414运算放大器、LCD12864显示、单片机以及外围电路构成的多波形发生器。利用MAX038产生正弦波、三角波、锯齿波、方波的波形，单片机通过D\A转换对MAX038的控制，从而实现频率和占空比的步进调控，在1Hz～2.4MHz内产生任意正弦波、三角波、锯齿波和方波。 采用MAX414和TLC549构成信号放大采样电路，用液晶模块LCD12864可实现实时显示波形的类型、频率、幅度和占空比等功能；。经多次测试，本设计整机具有波形清晰，频率、相位和幅度相对稳定，没有明显的失真，采用键盘输入，LCD显示，操作显示界面简单直观，实现按步进进行调整。 关键词：单片机 MAX038 D\A转换 占空比 LCD12864 Waveform Generator Abstract : The design is based on the signals in the chip-wave generator MAX038。This Multi-wave generator is make up of MAX038, D \ A conversion, MAX414 operational amplifiers, LCD12864, SCM and the external circuit. MAX038 is used to generate sine wave, triangle wave, sawtooth and square waveform, SCM through D \ A conversion of the control MAX038, thus realizing the frequency and duty cycle step-control, in the range of 1 Hz ～2.4MHz generate any sine wave, the triangular wave, sawtooth and square wave。MAX414 and TLC549 are make up of signal amplification and sampling, with LCD module LCD12864 can achieve real-time display of the waveform type, frequency, magnitude and the function of duty cycle Etc。 It is proved to be well functioning ,the output of signal is clear , the frequency, phase and amplitude are comparative stability, there was no obviously distortion, Using keyboard input and LCD output，makes it has a Simple user interface , realize step-control. Keyword: SCM MAX038 D/A converter Duty cycle LCD12864 目 录 系统设计……………………………………………………… 6 1.1 设计要求………………………………………………………………… 6 1.1.1 基本要求…………………………………………………………… 6 1.1.2 发挥部分…………………………………………………………… 6 1.2 总体设计方案……………………………………………………… 6 1.2.1 设计思路…………………………………………………………… 6 1.2.2 方案论证与比较………………………………………………… 6 1.2.3 系统组成 ………………………………………………………… 9 2.1 MAX038波形发生电路模块……………………………………… 9 2.2 CD4051模拟开关电路模块设计………………………………… 10 2.3 D/A转换电路模块设计………………………………………… 11 2.4 输出信号采样电路模块设计…………………………………… 12 2.5 LCD12864显示电路设计………………………………………… 12 2.6 4*4矩阵键盘