说明：  此为DDS AD9851之应用原文档，来源为Analog Device,主要可控制多颗9851,其应用为产生两正交之sin波.
(This is the DDS AD9851 Application of the original document, the source for Analog Device, mainly to control more than 9851 stars, and their use for the selection of the two orthogonal wave of sin.)