●The XR81111-CA04 is a clock synthesizer with Integer divider, LVPECL driver, 3.3 V/2.5 V supply, taking a 25 Mhz Xtal input and providing one of four
●selectable output frequencies. The device is optimized for use with a 25 Mhz crystal (or system clock) and generates a selection of output frequencies -
●156.25 Mhz for 10GE/XAUI, 150 Mhz for SAS, 125 Mhz for GE and 100 Mhz for PCIe applications. The application diagram below shows a typical synthesizer configuration with any standard crystal oscillating in fundamental mode. Internal load capacitors are optionally available to minimize/eliminate external crystal
●loads. A system clock can also be used to overdrive the oscillator for a synchronous timing system. The typical phase noise plot below shows the jitter integrated over the 12 Khz to 20 Mhz range that is widely used in WAN systems. Most LAN applications however use the integration range of 1.875 Mhz to 20 Mhz. These clock devices show a very good high frequency noise floor below - 150 DB. The XR81111 is a family of Universal Clock synthesizer devices in QFN-10 packages that are footprint compatible with industry standard 5 mm x 7 mm oscillators. The devices generate ANY frequency in the range of 100 MHz to 1.5 Ghz by utilizing a highly flexible delta sigma modulator and a wide ranging VCO. The high clock frequency LVPECL outputs have very low phase noise jitter of sub 0.6 ps, while consuming extremely low power. These devices can be used with standard crystals or external system clock and can be configured to select from four different frequency multiplier settings to support a wide variety of applications. This family of products have an extremely low power PLL block with core power consumption less than 40% of the equivalent devices from competition. By second sourcing several of the existing sockets, these devices provides a very compelling power efficiency
●value benefit across all market segments. Other clock multiplier and/or driver configurations are possible in this clock family and can be requested from the factory.
●Features:
● XR81111-CA04: Factory Configured
● Footprint compatible with 5 mm x 7 mm differential oscillators
● One differential LVPECL output pair
● Crystal oscillator interface which can also be overdriven using a single-ended reference clock
● Output frequency range: 100 Mhz - 156.25 Mhz
● Crystal/input frequency: 25 Mhz, parallel resonant crystal
● VCO range: 2 Ghz - 3 Ghz
● RMS phase jitter @ 156.25 Mhz, 12 Khz - 20 Mhz:
● Full 3.3 V or 2.5 V operating supply
● -40°C to 85°C ambient operating temperature
● Lead-free (RoHS 6) package
