High specification AT-cut crystals for 10 to 42MHz in fundamental mode
The ‘Q’ factor is a measurement of the loss of energy within the quartz. This is affected by the quality of the blank, surface finish (lapping), mounting technique and sealing. The higher the ‘Q’ factor the better the crystal. The higher the frequency the more important the ‘Q’ factor is to the Design Engineer. The maximum attainable short term stability of a crystal also depends on the ‘Q’ value.
A wide frequency range is available including 10 to 42MHz at fundamental mode, 10 to 125MHz at 3rd Overtone and 70 to 175MHz at 5th Overtone. This is pushing the design limits of quartz crystals due to the thinness of the blank that becomes unworkable beyond this. The new range offers exceptionally low aging down to 0.1ppm per year and tight frequency tolerance at 25ºC down to ±3ppm. This compares to standard crystals where typical figures would be 3ppm per year aging and ±10ppm frequency tolerance. Temperature stabilities down to 4ppm at 0 to 70ºC and 12ppm at -40 to 85ºC can be specified depending upon customers applications. Phase noise is critical in many applications and these high specification crystals offer excellent performance in this respect, including at high frequencies up to 100MHz at 5th Overtone.
Visit IQD Frequency Products at www.iqdfrequencyproducts.com
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