Digital waveform function generator based on MCU

This paper designs a brief structure and excellent performance waveform generator based on the Analog Device Company's DDS chip-AD985.It studies the software and hardware of arbitrary waveform generator controlled by the microcontroller.It takes the high performance microcontroller-AT89C52 as the controller,adopts DAC module of AD9857 to build arbitrary waveform.It designs some special circuits based on CPLD.It can produce standard waveform such as sine,square,triangle,and generate arbitrary waveform according to the user's demand,at the same time.