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同时输出的话,需要配置为slow mode,并且先Write data for DAC B to BUFFER,即R2R1=01,然后Write new DAC A value and update DAC A and B simultaneously,即R2R1=10.
现在双通道可以同时输出,但是读取寄存器SPD为快速模式是吗?
您好,抱歉回复晚了, 按照datasheet中的描述是不需要写两次的,两个输出的数据更新是发生在DAC A data的D0被采样之后的时钟上升沿。
并且顺序是先写DAC B data, 然后写DAC A data。下面这个顺序。
1. Write data for DAC B to BUFFER: 此时R1R0=01
2. Write new DAC A value and update DAC A and B simultaneously:此时R1R0=10
Both outputs are updated on the rising clock edge after D0 from the DAC A data word is sampled.