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关于LMX2541的问题

Other Parts Discussed in Thread: LMX2541

最近准备买一款LMX2541的芯片准备自己画板子,但是我看了datasheet中fExtVCOin的输入频率Min是400Mhz, 为什么有这种限制呢,我需要VCO输出不是直接反馈到这个端口,需要外面混频再输入这个端口,输入这个端口的频率是100Mhz,我在想用100Mhz输入这个端口可以吗?哪位高手用过这款芯片,能否为我解惑下,万分感激!!!!!