The AD8342 shows RF Spurious at the Output

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Accepted Answer

Question I am using the AD8342 with a balun at the Output like described in the 
 datasheet. We found RF spurious at the output - what could be the issue?
 
 Now I experience a lot of unexplained problems, as strong spurious extending 
 well beyond intended 
 spectrum. Not surprisingly, the IC runs quite hot. Answer I finally found the Big problem plaguing our design; apart from the 
 exposed pad that should be connected to GND, we used a ceramic balun as output 
 “transformer” (reference 1600BL15B100), since our output frequency was fixed at 
 1575MHz; by the way, quite unexpectedly, the AD8342 was absolutely not 
 appreciating this component, causing wideband noise/instability. 
 Substituting with an ETC1-1-13 (with adequate polarization) just works as 
 expected. 
 
 In addition the exposed Pad should be connected to GND

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AD8342: FAQ