Lowest-jitter programmable crystal oscillators on short lead times

June 30, 2017 //By Graham Prophet
Lowest-jitter programmable crystal oscillators on short lead times
Silicon Labs has added a set of high-performance crystal oscillators (XOs) claiming them to presentthe lowest-available jitter, frequency-flexible solution. The Si54x Ultra Series XOs deliver ultra-low jitter performance down to 80 femtoseconds (fsec) for both integer and fractional frequencies across the entire operating range.

These XOs provide optimum frequency flexibility and jitter margin for demanding applications including 100G/200G/400G line cards and optical modules, hyperscale data centres, broadband, wireless infrastructure, broadcast video, industrial, test and measurement, and military/aerospace. They are available with single, dual and quad frequency options in an standard 3.2 x 5 mm package, enabling simple, drop-in compatibility with traditional XOs while providing short lead times and high reliability.


Ultra-low jitter XOs (< 200 fsec RMS) are necessary in applications where high clock noise would result in unacceptably high bit error rates (BER), lost traffic or loss of system communication. Silicon Labs keeps pre-screened XO stock on hand. When an order arrives, the appropriate stock is programmed to the exact frequency, and each device undergoes 100% electrical testing prior to shipment. This optimized supply chain enables Silicon Labs to ship samples of any frequency XO in 1-2 weeks and production quantities in four weeks.


Si54x oscillators use Silicon Labs’ fourth-generation DSPLL technology to provide an ultra-low-jitter clock source at any output frequency. The device is factory-programmed to any frequency from 200 kHz to 1.5 GHz with <1 ppb resolution. On-chip power supply regulation provides power supply noise rejection, enabling consistent, reliable low-jitter operation in noisy environments often found in high-speed networking and data centres. Si54x XOs also provide flexible, reliable drop-in replacements for low-jitter surface acoustic wave (SAW)-based oscillators while offering superior frequency tolerance and temperature stability. Si54x oscillators support all popular output formats including LVDS, LVPECL, HCSL, CML, CMOS and Dual CMOS.


- An online part number configuration utility enables designers to specify the oscillator they need and get an orderable part number.

- An online oscillator phase noise look-up tool provides access to thousands of phase noise measurements collected for Silicon Labs oscillators, to view device phase noise and jitter performance across a wide number of operating frequencies.

- An online cross-reference search utility helps customers find Silicon

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