Using Direct Clock on AD9081

Question

Hello, 
 We would like to use AD9081 Direct Clock. (12GHz) 
 
 The datasheet says 0 to 6 dBm range when Direct RF input. 
 ez.analog.com/.../using-an-external-clock-with-ad9081-fmca-ebz 
 
 However, when we tried it, we found that it works only when we input higher power like the answer above. 
 (12GHz, 15 dBm or more , Source : Keysight E8257D) 
 When input below 9.5 GHz, it operates below 6 dBm. 
 Is it okay to use Direct CLK input at 12GHz with such a high input? 
 If not, is there anything I need to set up? 
 
 Thank you!

UmeshJ · Accepted Answer

This could mean there is a lot of insertion loss in the cable connectors between the signal generator and the eval board. it is ok to use 15dBm clock signal power

FormerMember · Answer

Hello, 
 Besides cable losses from RF generator, the frequency response of the clock input path (SMA to clock input) also rolls off significantly at 12 GHz thus requiring such a high drive level to overcome the losses so 13 dBm operation of RF generator is fine.

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Using Direct Clock on AD9081

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