SI570

Si570/Si571 1 0 M H Z TO 1 . 4 G H Z I 2C P ROGRAMMABLE X O / V C X O Features  Any programmable output  Internal fixed crystal frequency frequencies from 10 to 945 MHz and ensures high reliability and low select frequencies to 1.4 GHz aging  I2C serial interface  Available LVPECL, CMOS,  3rd generation DSPLL® with superior LVDS, and CML outputs jitter performance  3x better frequency stability than SAW-based oscillators  Industry-standard 5x7 mm package  Pb-free/RoHS-compliant  1.8, 2.5, or 3.3 V supply Applications  SONET/SDH  xDSL  10 GbE LAN/WAN  ATE  High performance instrumentation  Low-jitter clock generation  Optical modules  Clock and data recovery Description The Si570 XO/Si571 VCXO utilizes Silicon Laboratories’ advanced DSPLL® circuitry to provide a low-jitter clock at any frequency. The Si570/Si571 are userprogrammable to any output frequency from 10 to 945 MHz and select frequencies to 1400 MHz with <1 ppb resolution. The device is programmed via an I2C serial interface. Unlike traditional XO/VCXOs where a different crystal is required for each output frequency, the Si57x uses one fixed-frequency crystal and a DSPLL clock synthesis IC to provide any-frequency operation. This IC-based approach allows the crystal resonator to provide exceptional frequency stability and reliability. In addition, DSPLL clock synthesis provides superior supply noise rejection, simplifying the task of generating low-jitter clocks in noisy environments...