文中设计基于AVR单片机AT90S8515和DDS芯片AD9835的信号发生器的硬件电路，给出AD9835工作流程图和AT90S8515串行加载AD9835芯片的时序图。-In this paper，the design of a signal generator circuit based on AVR microprocessor AT90S8515 and DDS chip AD9835 is introduced，illustrated the working diagram of AD

AVR DDS syntesizer with Proteus model and PCB

DDS function generator AD9851 and AVR witch source code.