SI5351A-B05082-GTR

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Clock Generators, Phase Lock Loops (PLLs) and Frequency Synthesizers have become essential building blocks of high-speed communication systems, ranging from small consumer electronics devices to special-purpose military systems. The development of this technology has been driven by the needs of these systems to keep tight synchronization of circuits in order to maintain their signal integrity. An important industrial-grade clock generator, the SI5351A-B05082-GTR from Silicon Labs, offers remarkable accuracy and versatility for such systems.

The SI5351A-B05082-GTR is a 3-input, 2-output clock generator and multiplexer (MUX) built with advanced CMOS technology on a 6 x 6-mm, 24-pin QFN (Quad Flat No-Lead) package. It provides accurate, low-jitter clock sources for high-speed communication systems, including those employing fiber optics and radio, and supplies multiple clock outputs for various components in cellular systems, including a step-down converter, a digitizer, and a time-of-flight camera. At its full rated performance, the Si5351A-B05082-GTR offers 1.2 ps RMS jitter, >150 dBc/Hz phase noise, and 1.5 µs output-to-output skew.

The Si5351A-B05082-GTR’s frequency synthesis capability is enabled by its onboard PLL, which consists of a digitally controlled oscillator (DCO), a fractional-N frequency synthesizer, and a frequency modulator. This architecture provides flexibility for generating output frequencies over a wide range, including frequencies that are unrelated to the reference frequency. It also allows for the generation of outputs that are synchronized with the reference signal, or locked to each other.

Thanks to its locked-to-reference capability, the output-to-output timing skew of the Si5351A-B05082-GTR is in the order of tens of picoseconds. This feature makes the device an excellent choice for systems that require outputs to be synchronized with each other, as in the case of multipliers, filters, demodulators, and other components used in communications systems.

The Si5351A-B05082-GTR also offers dynamic adjustment of its output frequencies. This is made possible by the device’s wide range of frequency ratios and the ability to adjust the output frequencies without resetting or powering down the device, thus increasing its flexibility for various applications.

Overall, the Si5351A-B05082-GTR is an ideal clock generator for high-speed communication systems due to its low jitter and wide frequency tuning range, as well as its dynamic adjustability. This makes it an ideal choice for systems that require high timing accuracy and synchronization of clock signals.

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