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我想产生一中频10M,带宽5M的中频信号，DAC转换时钟150MHZ, 随路时钟75MHZ，我给寄存器5赋值04，给寄存器8先赋值04，再赋值00，出来信号的包络不是矩形而是斜线性的，不知道是哪里出现问题，用的是自己的板子，内部FPGA设计逻辑用chipscope仿真了没错的。跪求该情况下DAC5681的寄存器配置。
