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Clock multiplier IC supports 10G line encoding rates

Posted: 06 Jan 2009 ?? ?Print Version ?Bookmark and Share

Keywords:chip Ethernet? multiplier clock IC? encoding rates 10G?

Si5315

Silicon Laboratories Inc. has introduced an expansion of its Any-Rate Precision Clock family with the Si5315, a jitter-attenuating clock multiplier IC that meets or exceeds the performance, integration, frequency and jitter requirements for the 1G and 10G Synchronous Ethernet (SyncE) market.

The Si5315 SyncE clock multiplier IC supports 10G line encoding rates (161.13MHz) in addition to SONET/SDH and Ethernet frequencies. The device requires no external PLL components, simplifying line card design and frequency translation in carrier Ethernet switch routers, wireless backhaul, 3G/4G base stations, multiservice access platforms, passive optical networking, IP digital subscriber line access multiplexer and T1/E1 infrastructure.

As service providers upgrade legacy circuit switched networks to more cost-effective carrier Ethernet/IP networks, communications equipment suppliers face challenges when translating between legacy SONET/SDH and Ethernet clock frequencies. Existing SyncE clock ICs and voltage-controlled crystal oscillator-based module level solutions are limited with poor jitter performance, limited frequency flexibility and lack of integration, thus making these traditional solutions difficult to use.

Reducing BOM, complexity
The company claims that the Si5315 provides the lowest jitter of any SyncE clock IC in the industry at less than 0.6ps rms phase jitter, meeting the jitter requirements specified by ITU-T G.8262 and providing significant margin to Gigabit Ethernet and 10GbE PHY jitter requirements. The Si5315 leverages Silicon Labs' patented DSPLL technology to integrate all key components of a high-performance analog PLL on chip. It generates more than 200 of the most popular frequency translations required in SyncE line card applications, simplifying design and reducing BOM cost and complexity.

"Current SyncE solutions are incomplete because they do not provide the breadth of frequencies and jitter performance to fully meet 10G requirements," said Dave Bresemann, VP of Silicon Labs. "Silicon Labs' solution provides an unprecedented level of frequency flexibility, integration and performance, simplifying design and lowering costs for our customers."

In addition to this new family of SyncE clocks, Silicon Labs offers a portfolio of frequency flexible, low jitter any-rate clock generators and buffers, jitter attenuating clock multipliers, XO/VCXOs, and silicon oscillators. These products use optimized DSPLL and MultiSynth technology to shorten lead times and deliver jitter performance for datacom, telecom, wireless, broadcast video, test and measurement, and consumer markets.

The Si5315 is packaged in a 36-lead, 6mm x 6mm QFN package with samples available this month and in full production in Q1 09. The Si5315A for 10G applications is priced at $17.72 in 1,000 piece quantities. The Si5315B for 1G applications is priced at $12.50 in 1,000 piece quantities.

- Henri Arnold
EE Times-Europe





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