10MHz to 1.5GHz low jitter and power-efficient universal clocks

Exar has unveiled universal clocks series XR811xx with a wide range of output frequencies from 10MHz to 1.5GHz, with ultra-low phase noise jitter of less than 200fS. Exar says these clocks 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 superior performance second source option. Exar explains its XR811xx synthesizers utilizes a highly flexible delta-sigma modulator and a very wide-ranging VCO in a PLL block that has been optimized to be extremely power efficient. XR811xx consume 20mA of current and said to dissipate 60% less power compared to other similar devices in the market. 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 synthesizers. The XR811xx family also offers a choice of LVCMOS, LVDS or LVPECL output drivers. XR811xx generate low output phase noise jitter (sub-200fS) as integrated over a PLL loop bandwidth of 1.875MHz – 20MHz. This spans the requirements of most WAN and LAN systems and supp...