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CDCE706时钟芯片输出波形的疑问

Other Parts Discussed in Thread: CDCE706

我用CDCE706时钟芯片,输入接了27M的晶振,CDCE706的6路输出是正负电压。这算正常的吗?我并没有对芯片进行编程。数据手册里不算说,默认输出27M的时钟吗?

这是晶振的输出,赋值不到1V,频率是27M

下面两图是CDCE706的两路输出,两路信号在芯片刚输出点和C32电容之后的波形是一样的。首先,这两路波形就不一样,另外,为什么会有负向的电压呢?

输出的频率倒是27M。请麻烦帮忙解答一下。谢谢