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DSP外部输入时钟频率及频偏设计要求

Part Number: TMS320C6747

TMS320C6747的手册上有写如果外部无源晶体输入,频率要求范围12~30Mhz, 这个是否是必须满足?如果我用48M的无源晶体,有什么影响? 另外DSP对时钟频偏是否有要求?如果有的话要在多少PPM?