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LO Max Frequency

Category: Datasheet/Specs
Product Number: LTC5548

Hi

I would like to use this mixer as Upconverter from 1.3GHz to 11.5GHz
Can I use the LO above RF , it means up to 12.8GHz? 
any degradation with performances?

(The LTC5548 datasheet limit the max LO frequency to 12GHz)
Roni