Exar announced an addition to its range of telecommunications timing products with a new family of Universal Clocks.
The XR811xx series offers a wide range of output frequencies from 10 MHz to 1,5 GHz, with ultra-low phase noise jitter of less than 200 fs. Designed for communications, audio/video and industrial applications, the QFN-10 and TSSOP-8 packaged devices are footprint compatible with industry standard synthesisers.
The design of the XR811xx synthesisers utilises a highly flexible delta-sigma modulator and a very wide-ranging VCO in a PLL block that has been optimised to be highly power efficient; core current consumption is just 20 mA. The PLL can operate from either an input system clock or a crystal, and incorporates both an integer divider and a high-resolution (<1 Hz) fractional divider for increased flexibility to generate any clock frequency.
Additionally, up to four different frequency multiplier settings can be stored, allowing for different application configurations and providing BOM savings compared to multiple synthesisers. The XR811xx family also offers a choice of LVCMOS, LVDS or LVPECL output drivers.
Exar’s Universal Clock devices deliver sub-200 fs output phase noise jitter as integrated over a PLL loop bandwidth of 1,875 MHz – 20 MHz. This spans the requirements of most WAN and LAN systems and supports communications standards including 10 GHz Ethernet, 2,5 GHz and 10 GHz SONET/SDH/OTN, xDSL and PCIe, as well as many other synchronised clock system applications.
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