基于DDS技术的汽车仪表校验频率信号发生器

Design of Frequency Signal Generator for Checking Motor Meter Based on DDS Technology

针对“便携式汽车仪表总成校验箱”系统的开发需要,设计了一种用于汽车电子转速表、里程表校验的频率信号发生器,论述了电路的设计原理和设计思想。利用单片机和CPLD结合,控制DDS集成芯片AD9850,按照自定义的通信协议,准确接收PC机的指令和数据,达到对信号频率和电压值在规定范围内实时任意调整的目的。具有体积小,成本低,可靠性高,完全满足汽车仪表校验的需要。

Due to need for the development of portable motor meter assembly checking box, a kind of frequency signal generator is designed, detailed design principle and idea are discussed. Combined with CPLD, the DDS integrated chip AD9850 is controlled by single chip machine. According to custom communication protocol, instructions and data from PC machine are received exactly to adjust the signal frequency and voltage peak within set ranges at the real time and at will. Because of the characteristics of small volume, low cost, high reliability and convenience upgrade, the system is fully used for checking motor meter.