1、 - I - 摘 要 函数发生器主要作为实验用信号源， 是现今各种电子电路实验设计应用中必不可少的仪 器设备之一。本次设计的主要目的就是为了学习基于单片机的函数发生器的工作原理，设计 出一个低频的函数发生器。从本次设计不仅可以让我对函数发生器的原理有更深的了解，而 且也对单片机的知识有更深的掌握。 单片机有很多种类，而且制作函数发生器的方案繁多，本次设计是以AT89C51单片机为核 心，选用DAC0832为数模转换芯片，并辅以必要的模拟电路，设计出了一个基于AT89C51单片 机的函数信号发生器。其设计内容主要包括单片机最小系统的设计、DA转换模块的设计、键 盘控制模块的设计及LCD显示模块的
2、设计。 其中DA转换模块包括2块DAC0832芯片和OP07运放电 路，第一块DA芯片的输出作为第二块DA芯片的参考电压，而第一块DA芯片的2.5V参考电压由 MC1403芯片的输出来提供；键盘控制模块采用3个按键来选择波形类型及调节频率、幅值；显 示模块则采用LCD1602来显示波形类型、频率及幅值；最终将设计好的函数发生器的输出接上 示波器，在示波器上显示实际输出的波形。 本设计最终能达到预期的效果，能实现电压步进0.1V，方波能够任意调节占空比以及在 LCD1602上显示波形类型、电压和频率，并且可以通过示波器来观察其输出的波形。 【关键词】 ：AT89C51 单片机；DAC0832；L
3、CD1602；按键 - II - ABSTRACT Function as the main generators by signals. Electronic circuits is now the design in the application of the necessary equipment. The design of the main purpose is to learn revivification function of the generators works, a low frequency function of the generators. in this d
4、esign could not only allow me to the principle functions of programme，there is more, but also for a more monolithic integrated circuits to learn. Monolithic integrated circuits there are many varieties, and the production function of the generators, the design is AT89c51 monolithic integrated circui
5、ts to the selection of a module dac0832 the chips, and supported by the simulation circuits, and devised a function of the signal based on at89c51 monolithic integrated circuits generators. The design includes monolithic integrated circuits to the system design, and D/A the module for the design, th
6、e keyboard control module of the design and LCD modules display design. One of D/A the modules including two dollars and op07 dac0832 the discharge of the D/A, the chip is the D/A chip of the voltage and the first piece of D/A chips 5v reference by 2. the voltage mc1403 chip of the output to provide; keyboard control in three key to select the type and frequency, wave of value displays module lcd1602;is used to indicate the type and frequency and wave be; Eventually will be designed to function
