30 April 2003 Menlo Park, CA Lightwave -- Frequency control product manufacturer SaRonix today released into full production the SEL381x Series of extended frequency LVPECL crystal clock oscillators, optimized for optical network interface cards (NICs). These subminiature oscillators feature an extensive frequency range of 25 through 670 MHz and stability as tight as ± 20ppm, all encased within an industry-standard leadless 5 x 7mm ceramic package, say company representatives. The compact size, comprehensive frequency range, and variety of stability options offer a space-saving solution with the right timing for Gigabit and 10-Gigabit Ethernet (GbE) as well as peripheral SONET/SDH OC-XX last mile networking equipment and linecards, say company representatives.
"The SEL381x Series breaks the size versus frequency barrier without sacrificing stability, and provides a reliable timing solution for customer premise, SOHO, campus-area, and FTTH/FTTU first/last mile NICs," asserts Brandon Ogilvie, marketing manager for SaRonix. "The economics of the 5 x 7 x 1.8-mm package in conjunction with its SONET minimum clock compliant frequency performance at 155.52 and 622.08 MHz are impressive." 10-GbE devices also benefit from the optimized performance at 156.25 and 312.5 MHz.
The SEL381x Series utilizes an AT-cut quartz crystal bulk-wave resonator to produce the broad frequency range of 25 to 670 MHz, thereby offering superior stability performance over SAW-based oscillators, contend SaRonix representatives. The SEL381x Series achieves frequency stabilities as tight as ± 20 ppm (0 to +70 ° C) and ± 50 ppm (-40 to +85 ° C) while not exceeding 3ps phase jitter (1-sigma RMS, 12kHz ∼ 40MHz band). The SEL381x supports 3.3V PECL (LVPECL) operation with typical supply current consumption of 85 mA and has differential outputs maintaining 45/55% waveform symmetry. Optionally, the output may be disabled to facilitate testing via one of its six gold-plated true SMD contact pads.
The SEL381x Series is now available for prototype and production builds. Ordering lead times range from stock to 12 weeks and prices start at $10 each for 1,000 pieces (may vary with exact specification). Tape and Reel packing is available in 500-piece increments.