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乘法型DAC的更新速率、采样速率以及乘法带宽是怎么定义的呀?之间有什么关系?

Other Parts Discussed in Thread: DAC7811

比如我看到一款12bit的并口DAC芯片,芯片资料显示Update rate of 20.4 MSPS ,10 MHz multiplying bandwidth;

另一款12bit的串口的DAC芯片DAC7811,芯片资料显示50MHz Serial Interface, 10MHz Multiplying Bandwidth。串口是50M的,一次需要传16bit(4个控制位),这样更新速率应该是50/16=3.125M,比10M的乘法带宽小很多呀,和采样定理冲突了!