Switchable crystal oscillators have frequency options

Switchable crystal oscillators from frequency control specialist, Euroquartz offer users the ability to provide four different frequencies. The QuikXO HC_JF series oscillators are available in frequencies from 15 to 2100MHz and with a choice of outputs including low voltage complementary metal-oxide semiconductor (LVCMOS) (up to 250MHz), low-voltage positive/pseudo emitter-coupled logic (LVPECL), low voltage differential signalling (LVDS) and current mode logic (CML) differential. High current steering logic (HCSL) differential outputs are available for frequencies up to 700MHz. Integrated phase jitter performance of 150fs maximum makes these crystal oscillators particularly suitable for high frequency applications, adds Euroquartz.

QuikXO HC_JF series crystal oscillators are available at low cost and can be delivered in days for prototypes with a choice of supply voltages – 1.8, 2.5 or 3.3V – across the range apart from LVPECL with 2.5 and 3.3V only. Customers can select any four frequencies in the range and the oscillator can switch to each as required, useful in frequency bus distribution applications on multi-processor boards where several frequencies are required for the different processors. The four chosen frequencies can all be synchronised from the single crystal oscillator instead of trying to sequence multiple clocks to achieve switching in of the various processors.

Frequency selection is made using two logic control pads FS0 and FS1 to provide the four user selectable frequencies with frequency select timing of 2.5milli-seconds maximum. Frequency stability specifications of ±25, ±50 and ±100ppm over both commercial (-10 to +70 degrees C) and industrial (-40 to +85 degrees C) temperature ranges are available as standard.

Other specifications include maximum ageing of ±3ppm in the first year, duty cycle of 50 per cent ±five per cent, rise times of 0.35nano-seconds maximum and current consumption from 62 to 99mA typical, depending on output logic selected. Additional features include start-up time of five milliseconds typical, 10milli-seconds maximum and output enable/disable functions.

The RoHS compliant QuikXO HC_JF crystal oscillators are housed in industry standard eight-pad, 7.0 x 5.0mm surface mount packages capable of withstanding 260 degree C for 10 seconds, twice. Storage temperature range is -55 to +155 degree C.

Euroquartz is an independent UK-based manufacturer and supplier of quartz crystals, oscillators, filters and frequency-related products to the electronics manufacturing industry worldwide. The company is AS9100 registered and designs and manufactures a comprehensive range of frequency control components for a range of customers including major OEMs covering a broad spectrum of applications including military and aerospace, communications, general electronics, computing, control systems and petrochemical.


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