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 company says that the new CFPT-9400 range eliminates reception 'slips' that compromise the effective bandwidth of SDH/SONET and Gigabit Ethernet fibre networks.
Improving the jitter performance and temperature stability of oscillators increases the effective capacity of the fibre network by reducing the number of dropped packets and hence the number of resends required. The CFPT-9400 achieves superior jitter performance of less than 3 ps r.m.s., 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 forward error correction; and 644,53125 MHz and 693,48299 MHz for Gigabit Ethernet and emerging 10 Gbit Ethernet applications. Frequency adjustment of up to ±60 ppm is available through external voltage control. The Pluto temperature compensation technology keeps frequency stability over the 0 to +80°C operating temperature range to ±1,5 ppm.
Supply voltage is 3,3 V with a low 65 mA current consumption typical, and output is 3,3 V PECL (LVPECL) compatible. The CFPT-9400 comes in an industry standard 14 x 9 mm SMD.
For more information contact Jeva Narian, Arrow Altech Distribution, +27 (0)11 923 9600, [email protected]
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