Electronics Technology


Single- and dual-frequency XOs

4 August 2010 Electronics Technology

The new high-precision devices provide total frequency stability of ±50 parts per million (ppm) and will meet clock generation requirements in next generation low-voltage differential signalling (LVDS) and low-voltage positive emitter coupled logic (LVPECL) designs.

The NBXzzzzzz series of single- and dual-frequency modules provides low jitter and low 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 phase locked loop (PLL) multiplier to provide the highly accurate single- or dual-output frequency. Typical RMS phase jitter is rated at just 0,5 ps when output single side band (SSB) is integrated between 12 kHz and 20 MHz. Output frequency options for single frequency modules are 161,13 MHz; 175,00 MHz; 187,50 MHz; 340,00 MHz; 425,00 MHz; 622,08 MHz. Dual frequency modules offer user selectable output frequency of 106,25 MHz/212,50 MHz; 125 MHz/250 MHz; 155,52 MHz/311,04 MHz; 156,25 MHz/312,50 MHz; 200,00 MHz/400,00 MHz. As a result, designers can choose modules that are optimised for a variety of specific protocols including Ethernet, Gigabit Ethernet, 1x and 2x Fibre Channel, SATA, SONET/SDH and PCIe.

The devices operate from a 2,5 V and 3,3 V input voltage and are supplied in an hermetically sealed 5 x 7 x 1,9 mm ceramic CLCC-6 SMD package.

For more information contact EBV Electrolink, +27 (0)21 402 1940, capetown@ebv.com, www.ebv.com



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