Frequency

Fundamental mode crystals enable superior phase noise performance

21st July 2015
Nat Bowers

Offering frequencies from 1.0 to 50MHz, a series of miniature VCXOs that use fundamental mode crystals for superior phase noise performance have been unveiled by Euroquartz. The G326 series VCXOs feature integrated phase jitter of 200fs typical and are suited for use in applications such as PLL, SONET, ATM,STBs, MPEG, audio-video modulation, video game consoles, HDTV, ONET, 10GbE, fibre channel, wireless repeaters, transponders, FPGAs and data acquisition.

Unlike standard clock oscillators that have a fixed output frequency, the output of VCXOs such as G326 can be tuned 50 to 200ppm up or down from the nominal frequency by varying a control voltage accessed via pad 1 on the device. This control voltage operates on a ‘varactor,’ a voltage variable capacitance tuning diode. Therefore, VCXOs may be used to dynamically alter the system clock frequency.

Housed in a low mass, ultra-miniature 6-pad SMD package measuring 3.2x2.5x1.0mm, the G326 series VCXOs are available in 1.8, 2.5, 3.3 or 5VDC supply voltage versions and offer CMOS (15pF) or TTL (two gates) output. Additional specifications include rise/fall times of 6ns maximum, duty cycle of 50% ±10% as standard with ±5% available to order, maximum start-up time of 10ms, current consumption of 10 to 45mA (dependent on frequency) and linearity of 6% typical, 10% maximum. Ageing is ±3ppm per year maximum.

Available in both commercial (-10 to +70°C) and industrial (-40 to +85°C) operating temperature ranges, the G326 series extends Euroquartz’s wide range of VCXOs that are produced with CMOS, PECL, LVDS or sine wave outputs in a wide variety of leaded and surface mount package styles.

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