Wide frequency universal clocks offer ultra low jitter
1 min read
Exar has extended its range of telecommunications timing products with a new family of universal clocks.
The XR811xx series offers a range of output frequencies from 10MHz to 1.5GHz, with ultra low phase noise jitter of less than 200fs.
Designed for communications, audio/video and industrial applications, the QFN-10 and TSSOP-8 packaged devices are footprint compatible with industry standard synthesizers, providing a second source option.
The synthesisers utilise a flexible delta-sigma modulator and a wide ranging VCO in a PLL block that has been optimised to be particularly power efficient.
With a core current consumption of just 20mA, the parts are said to dissipate 60% less power than equivalent competitive devices. The PLL can operate from either an input system clock or a crystal and incorporates both an integer divider and a high resolution (<1Hz) 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 providing BOM savings compared to multiple synthesisers. The XR811xx family also offers a choice of LVCMOS, LVDS or LVPECL output drivers.
