在多通道的信号采集器的设计当中,AD外部时钟引脚被同一时钟信号驱动时,应该怎样考虑时钟源驱动能力是否满足多片AD外部时钟要求,主要考虑时钟源电流驱动能力,还是考虑时钟源的负载驱动能力?比如使用4片ADS1281由同一有源晶振驱动,晶振的电流输出最大为16mA,其能够满足驱动条件吗?另外,在ADS1281的数据手册当中没有时钟引脚CLK的等效输入电容,其多片ADC会对时钟源信号产生影响吗?
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