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Crystal oscillators deliver 50ppm frequency stability

Posted: 28 Sep 2009 ?? ?Print Version ?Bookmark and Share

Keywords:crystal oscillator? clock module? LVDS?

NBXzzzzzz oscillators

ON Semiconductor has expanded its PureEdge family of high accuracy crystal oscillator (XO) clock modules that provide total frequency stability of 50ppm. They meet clock generation requirements in next generation LVDS and low-voltage positive emitter coupled logic (LVPECL) designs.

The NBXzzzzzz series of single- and dual-frequency modules provide ultralow jitter and ultralow phase noise LVDS and LVPECL differential outputs respectively. Applications include frequency control and high accuracy clock trees in high-speed LAN and WAN networking equipment, telecom base stations, storage systems and high-end computing platforms.

All of the new modules use a low frequency, high Q fundamental mode crystal and analog PLL multiplier to provide the high accuracy single- or dual-output frequency. Typical RMS phase jitter is rated at just 0.5ps when output single side band is integrated between 12kHz and 20MHz. Output frequency options for single-frequency modules are 161.13MHz; 175MHz; 187.5MHz; 340MHz; 425MHz; 622.08MHz. Dual-frequency modules offer user selectable output frequency of 106.25MHz/212.5MHz; 125MHz/250MHz; 155.52MHz/311.04MHz; 156.25MHz/312.5MHz; 200MHz/400MHz. As a result, designers can choose modules that are optimized for a variety of specific protocols including Ethernet, Gigabit Ethernet, 1x and 2x Fibre Channel, SATA, SONET/SDH and PCIe.

"Delivering high precision across a variety of operating conditions, ON Semiconductor's latest PureEdge clock modules provide the accuracy and reliability demanded by new and emerging LVDS and LVPECL clock tree designs," said Ryan Cameron, director, custom industrial and timing products business unit at ON Semiconductor. "What's more, these silicon-based devices are simpler to manufacture and offer more flexibility with better performance and lead time than conventional quartz-based alternatives, helping OEMs to reduce costs without sacrificing performance."

All of the new modules operate from a 2.5V and 3.3V input voltage and are supplied in a hermetically sealed 5mm x 7mm x 1.9mm ceramic CLCC-6 SMD package.

Budgetary pricing for these modules is $4.50 for quantities of 100 units.

For application notes on crystal oscillatorsclick here.

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