13 Dec 2017

High-performance oscillators tackle high-speed transceiver clocking

Silicon Labs has introduced a new family of high-performance I2C-programmable crystal oscillators (XOs) delivering excellent jitter performance and frequency flexibility.

With typical jitter performance as low as 95 femtoseconds (fs), the Si544/Si549 Ultra Series programmable XOs maximize jitter margin for clocking high-speed 28 Gbps and 56 Gbps transceivers used in 100/200/400G communications and data center applications. The devices are capable of generating any frequency from 200 kHz to 1.5 GHz with no frequency gaps and 4 parts-per-trillion (ppt) tuning resolution, enabling a single device to be used across a broad spectrum of applications.

“Optical networks, hyperscale data centers and mobile fronthaul/backhaul networks are moving to higher speeds, increasing the need for ultra-low-jitter timing solutions,” said James Wilson, Senior Marketing Director for Silicon Labs’ timing products. “By choosing Silicon Labs’ I2C-configurable Si54x Ultra Series oscillators, system designers will have peace of mind knowing that they are using the industry’s most frequency flexible programmable XOs while maximizing SNR headroom, de-risking development and helping to ensure first-pass design success.”

The Si544/Si549 XOs support up to four preset, pin-selectable start-up frequencies. After power-up, the device operating frequency can easily be changed via an I2C interface. This configuration flexibility enables a single oscillator to replace multiple single, dual and quad-frequency XOs and multiplexer (mux) devices with a single oscillator. The device can be powered from a single 1.8, 2.5 or 3.3 V supply, eliminating the need for different XO part numbers for different supply voltages. The Si54x XO’s I2C interface supports update rates as high as 1 MHz (Fast-mode Plus), maximizing compatibility with a broad range of ASSPs, ASICs, SoCs and FPGAs.

The Si544/Si549 XOs are available in 3.2 mm x 5 mm and 5 x 7 mm packages, providing superior frequency flexibility in the same footprint as a standard, fixed-frequency XO. This compatibility enables hardware designers to prototype with an I2C-programmable XO and easily migrate to a single-frequency XO when the design transitions to production.

The Si54x XOs are purpose-built for 56 Gbps transceiver designs. These designs rely on pulse-amplitude modulation (PAM4) signaling for serial data transmission. PAM4 uses four-level signaling to increase the bit rate per channel while keeping the bandwidth constant. This tradeoff makes the design inherently more susceptible to noise. Using an ultra-low-jitter reference clock such as the Si544/Si549 devices maximizes signal-to-noise ratio (SNR) headroom, helps prevent bit-errors and helps maintain signal integrity.

The Si544/Si549 oscillators use Silicon Labs’ advanced fourth-generation DSPLL technology to provide an ultra-low-jitter clock source at any output frequency. The devices are programmable to any frequency from 200 kHz to 1.5 GHz with 4 ppt 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 centers. The Si544/Si549 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. The Si544/Si549 oscillators support all popular output formats including LVDS, LVPECL, HCSL, CML, CMOS and Dual CMOS.

In addition to the Si544/Si549 family, Silicon Labs is significantly expanding its XO/VCXO portfolio to include a broader array of package options. These complementary products include Si54x Ultra Series XOs in the industry-standard 5 mm x 7 mm package, Si59x general-purpose XO/VCXOs (3.2 mm x 5 mm) and Si51x general-purpose XO/VCXOs (2.5 mm x 3.2 mm).

Samples and production quantities of the Si544/Si549 Ultra Series oscillators are available now.

Most popular news in Electronics components

Digi-Key announces 1.0 release of the KiCad library
Low reverse-current Schottky diode offers improved thermal performance
High-torque stepper motors deliver precision motion control
Offline buck converter for IoT applications
Micron-to-sub-millimeter accuracy for 3D printers

All news in this channel | All news


Share this page


Want more like this? Register for our newsletter






The benefits of replacing plain old paper with e-paper displays in automotive assembly plants HD Lee | Pervasive Displays
The benefits of replacing plain old paper with e-paper displays in automotive assembly plants
Efficiency is at the heart of automation, and that is nowhere more apparent than in the manufacture of automobiles. The Ford Motor Company is widely credited with inventing the moving assembly line, but the concept of moving the assembly, rather than the worker, dates back centuries.









Radio-Electronics.com is operated and owned by Adrio Communications Ltd and edited by Ian Poole. All information is © Adrio Communications Ltd and may not be copied except for individual personal use. This includes copying material in whatever form into website pages. While every effort is made to ensure the accuracy of the information on Radio-Electronics.com, no liability is accepted for any consequences of using it. This site uses cookies. By using this site, these terms including the use of cookies are accepted. More explanation can be found in our Privacy Policy