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TDC7200 外接10M信号无法正常工作

Other Parts Discussed in Thread: TDC7200

   本人所用TDC7200 用自带晶振可以正常测量,外接GPS 10M信号,有的GPS提供的信号可以正常测量(HP 58503A 的10Mhz),但是有的GPS10Mhz 信号接入却无法工作,如EndRun technologies 的GPS 钟。怀疑是阻抗匹配的问题·,求大神指导。不知道TDC7200 的10M输入的阻抗是大神?