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Surface-mount oscillator boasts low offset jitter

Posted: 25 Nov 2002 ?? ?Print Version ?Bookmark and Share

Keywords:mf electronics? r2950? clock oscillator? surface mount oscillator? crystal oscillator?

MF Electronics Corp.'s surface-mount R2950 clock oscillator for advanced portable, wireless, and SONET systems replaces the much larger through-hole oscillators that used to be the only source for the combined 40MHz, 1ps maximum offset jitter, and -40C to 85C operation.

The device's dual complementary output, based on ECLPS low-voltage positive emitter-coupled logic, permits differential drive for noise-suppressing clock-signal transmission across PCBs and backplanes.

The R2950 covers 19.44MHz to 400MHz, with maximum broadband jitter below 6ps rms and maximum 12kHz to 20MHz offset jitter below 1ps rms. Typical waveform rise-and-fall time is 225ps; waveform symmetry is 45/55. The units operate on a 3.3Vdc supply and come in surface-mount packages measuring 5-by-7-by-1.9mm.

The oscillator can be supplied in two stability grades of 100ppm and 50ppm. Stability specifications cover variations in dc supply voltage and load, as well as temperature. Typical aging during the first year of operation is 3ppm, decreasing to 1 ppm/year in subsequent years, according to the company.

The devices are priced at $20 apiece in 1,000-unit quantities at common standard frequencies (there is a price premium for non-standard frequencies), but lower in much larger OEM quantities. Standard-frequency oscillators are available from stock.

EE Times

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