Clock synthesiser targets comms & industrial applications

Utilising a flexible delta-sigma modulator and a very wide-ranging VCO in a PLL block, the XR81112 features a core current consumption of just 20mA. The clock synthesisers dissipate 60% less power than equivalent competitive devices (according to Exar) and provide a significant power efficiency benefit to system designers. Operating from an input system clock or a crystal, the PLL incorporates an integer divider and a sub-1Hz fractional divider to increase flexibility to generate any clock frequency.

Configurable for LVCMOS, LVDS or LVPECL outputs, the XR81112 can store up to four different frequency multiplier settings. This enables different application configurations and provides BOM savings compared to multiple synthesisers. Supporting the requirements of most WAN and LAN systems, the extremely low, sub-200fs, output phase noise jitter is integrated over a 1.875-20MHz bandwidth. It is available as a pre-configured device or can be optionally programmed by 3rd party programming houses.

James Lougheed, Vice President, Communications Products, Exar, comments: “The tiny XR81112 series of devices adds to Exar’s Universal Clock family as the smallest device on the market possessing such a broad range of capabilities. With the ability to configure to CMOS, LVDS or LVPECL outputs as well as up to four selectable output frequencies between 10MHz and 1.5GHz, the XR81112 offers unrivalled flexibility in the smallest form factor. All this capability while consuming less than half of the power of competitors clearly puts the XR81112 in a class of its own.”

Supplied in an RoHS compliant 3x3mm QFN-12 package, the XR81112 series is available now priced at $7.00 each in 1,000 unit quantities.