Harlow, UK C-MAC MicroTechnology has launched a range of low-jitter high-frequency TCVCXOs (temperature compensated, voltage controlled crystal oscillators) for use in TDM (time division multiplexing) switching systems for optical fibre backbone infrastructure. By using a high-frequency fundamental crystal together with C-MAC's Pluto temperature compensation technology, the new CFPT-9400 range is designed to eliminate reception 'slips' that compromise the effective bandwidth of SDH/SONET and Gigabit Ethernet fibre networks. The CFPT-9400 achieves excellent jitter performance of less than 3 ps rms 10 Hz to 80 MHz by avoiding the use of a phase locked loop in favour of a low-phase-noise HFF (high-frequency fundamental) crystal and harmonic multiplication. The HFF crystal is coupled through a SAW (surface acoustic wave) filter, suppressing any sub-harmonics of the operating frequency to typically less than "55 dBc. The CFPT-9400 is available in five output frequencies: 622.08000 MHz, 666.51436 MHz and 669.32658 MHz for SDH/SONET switches with or without FEC (forward error correction); and 644.53125 MHz and 693.48299 MHz for Gigabit Ethernet and emerging 10 Gbit Ethernet applications, with or without FEC. Frequency adjustment of up to ±60 ppm is available through external voltage control. Supply voltage is 3.3 V with a low current consumption of 65 mA typical, and output is 3.3 V PECL (LVPECL) compatible. The CFPT-9400 is packaged as an industry standard 14 x 9 mm SMD. It is designed for lead free soldering and compliant with all requirements of the RoHS regulations. C-MAC MicroTechnology , Harlow, UK. www.cmac.com.
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