FemtoClock® Low Phase-Noise Freq. Synthesizers

IDT FemtoClock® devices are advanced clock frequency synthesizers employing a simple, low cost, fundamental-mode quartz crystal as the low frequency reference from which they synthesize high quality, high frequency clock signals. Yielding phase noise jitter of less than 1picosecond (ps) RMS, they are ideal reference clocks for almost any jitter-sensitive application. FemtoClocks provide output clocks up to 800 MHz. Often used to replace third overtone and high frequency fundamental (HFF, inverted mesa) crystal oscillators or expensive surface acoustic wave (SAW) oscillators traditionally used to generate high frequency clock signals, they are more reliable, cost less, and are more readily available.

Unlike fixed frequency oscillators, FemtoClocks are a frequency-synthesis technology capable of multiple clock frequencies and more flexible in any application. Because FemtoClocks are silicon IC-based clock devices, additional clock tree functions unavailable in a single function fixed frequency oscillator can be integrated into a single device. The IDT FemtoClock family delivers a wide range of device packages and capabilities, starting with small 8-pin TSSOP devices that provide one clean, low jitter clock signal. Also available are devices with more integrated functions, multiple outputs, multiple frequencies and other more complex programmable synthesis functions. While generally optimized for synthesizing reference clock frequencies commonly used in communication applications like ethernet, SONET and wireless infrastructure, there are also a variety of FemtoClock devices with frequencies useful for CPU, memory, logic and other general-purpose clocking applications.