XR81101-AA02-F MaxLinear

XR81101 Universal Clock - High Frequency LVCMOS Clock Synthesizer FEATURES General Description XR81101-AA02: Factory configured The XR81101-AA02 is a clock synthesizer operating at a 3.3V/2.5V sup- One LVCMOS output ply with Integer divider, using a 25MHz parallel resonant crystal reference Crystal oscillator interface which can also be input provides a 125MHz LVCMOS output. The device is optimized for overdriven using a single-ended reference clock use with a 25MHz crystal (or system clock) and generates a 125MHz out- Output frequency: 125MHz put clock for GE applications. The LVCMOS output has very low phase Crystal/input frequency: 25MHz, parallel resonant noise jitter of sub 150fs, while consuming extremely low power. crystal The application diagram below shows a typical synthesizer configuration RMS phase jitter 125MHz, 1.875MHz - 20MHz: < 150fs with any standard crystal oscillating in fundamental mode. Internal load Full 3.3V or 2.5V operating supply capacitors are optionally available to minimize/eliminate external crystal -40C to 85C ambient operating temperature loads. A system clock can also be used to overdrive the oscillator for a synchronous timing system. Lead-free (RoHS 6) package The typical phase noise plot below shows the jitter integrated over the APPLICATIONS 1.875MHz to 20MHz range that is widely used in WAN systems. These Gigabit Ethernet clock devices show a very good high frequency noise floor below -150dB. Low-jitter Clock Generation The XR81101 is a family of Universal Clock synthesizer devices in Synchronized clock systems TSSOP-8 packages. The devices generate ANY frequency in the range of 10MHz to 200MHz by utilizing a highly flexible delta sigma modulator and Ordering Information page 8 a wide ranging VCO. These devices can be used with standard crystals or external system clock to support a wide variety of applications. This family of products has an extremely low power PLL block with core power con- sumption 40% less than the equivalent devices from competition. By sec- ond sourcing several of the existing sockets, these devices provides a very compelling power efficiency value benefit across all market seg- ments. Other clock multiplier and/or driver configurations are possible in this clock family and can be requested from the factory Typical Application XR81101 AA02 XR81101 PHASE NOISE (dBc/Hz) -40db V CC 2.5V or 3.3V RMS Jitter = 123.6fs Q -60db XTAL IN 125MHz Int Range 1.875MHz to 20MHz -80db 25MHz -100db XTAL OUT -120db Enable OE -140db V EE -160db -180db 100Hz 1KHz 10KHz 100KHz 1MHz 10MHz 2014 Exar Corporation 1 / 8 exar.comXR81101 Rev 1AXR81101 Absolute Maximum Ratings Operating Conditions Stresses beyond those listed under Absolute Maximum Operating Temperature Range.....................-40C to +85C Ratings may cause permanent damage to the device. Exposure to any Maximum Rating condition for extended periods may affect device reliability and lifetime. Supply Voltage..........................................................+4.2V Input Voltage......................................-0.5V to VCC + 0.5V Output Voltage...................................-0.5V to VCC + 0.5V Reference Frequency/Input Crystal.........10MHz to 60MHz Storage Temperature................................-55C to +125C Lead Temperature (Soldering, 10 sec).....................300C ESD Rating (HBM - Human Body Model)....................2kV 2014 Exar Corporation 2 / 8 exar.com/XR81101 Rev 1A