The Si549 from Silicon Labs is a crystal oscillator that provides an ultra-low jitter, low phase noise clock at an output frequency from 0.2 to 1500 MHz. This crystal oscillator is user-programmable via simple I2C commands and has less than 1 ppb resolution with excellent power supply noise rejection due to on-chip power supply filtering. The XO has a phase jitter of only 95 fs (femtoseconds) for optical networking, 100G+ optical modules, coherent optics, broadband, data center, broadcast video, test and measurement and FPGA/ASIC clocking applications. It is available in a small, industry-standard 3.2 x 5 mm package.
Specific configurations are factory-programmed at the time of shipment, eliminating the long lead times associated with custom oscillators. Silicon Labs ships custom frequency samples 1-2 weeks after receipt of an order.