Design of Key Control Signal Generator Based on AD9951

The aim of this experiment is to give a design of a key-controlled signal source with high performance.In the design process,Direct Digital Frequency Synthesis(DDS) method is used.By using AD9951 DDS chip as the core chip and the main controller,a signal source is obtained and the output frequency and waveform can be controlled by keyboard and displayed by LCD.This design can output sine wave,square wave and triangular wave between 0.1 kHz～80 MHz.Results of the experiment shows that this design has many advantages:the structure of hardware circuit is simple,the software and hardware circuit have a good extend space and the output signal has a stable frequency with high frequency resolution.