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请教关于DAC1280的时序



最上方紫色表示4M的晶振一个周期用1clk表示;

中间位16分频(根据手册)后的输入的比特流;

这里的比特流固定为25%;

理论输出(根据手册)应该输出一个最低电压;

但是实际输出为一个奇怪的波形,请问这里的时序是对的吗