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TI参考设计TIDA-00886中,为何对LMX2571使用了两个晶体振荡器作参考时钟源?

Other Parts Discussed in Thread: LMX2571

如图所示,使用了一个CWX813-20MHz的CMOS时钟,和一个7B-10.000MEEQ时钟。

为何做这样的设计?

我正在设计一个扫频仪,是否可以使用单一晶振为LMX2571提供时钟?