New ultra-miniature VCXO oscillators offer superior phase noise performance

Employing fundamental mode crystals for superior phase-noise performance, a new series of Euroquartz ultra-miniature voltage-controlled crystal oscillators (VCXOs) is now available from Saelig. Available in frequencies from 1MHz to 50MHz, the new G326 series VCXOs feature integrated phase jitter of 200fs (typical) and suit a wide range of timing applications, such as phase lock loops (PLL), SONET, ATM, set-top boxes, MPEG, audio-video modulation, video game consoles and HDTV, ONET, 10GbE, Fibre Channel, wireless repeaters, transponders, FPGAs, data acquisition, etc. Unlike standard clock oscillators that have a fixed output frequency, the output of G326 VCXOs can be tuned 50 to 200ppm up or down from the nominal frequency by varying a control voltage accessed via a pad on the component. This control voltage operates on a varactor - a voltage variable capacitance tuning diode - so G326 VCXOs are ideal for systems that need to be able to dynamically alter the system clock frequency. Housed in a low mass, ultra-miniature 6-pad SMD package measuring 3.2mm x 2.5m x 1mm, 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% (±5% available to order), start-up time within 10ms, current consumption of 10 to 45mA dependent on frequency, and linearity of 6% typical, 10% maximum. The devices are available in both commercial (-10C to +70C) and industrial (-40C to +85C) operating temperature ranges.