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The Si5364 is a complete solution for ultra-low jitter high-speed clock generation and distribution in precision clocking applications such as OC-192/OC-48 SONET/SDH line/port cards.
This device phase locks to one of three reference inputs in the range of 19.44 MHz and generates four synchronous clock outputs that can be independently configured for operation in the 19, 155 or 622 MHz range (1x, 8x and 32x input clock). The device reference monitoring and clock switching functions support Stratum 2/3/3E and SMC compatible clock switching with excellent output phase transient characteristics. FEC rates are supported with selectable 15/14 or 14/15 scaling of the clock multiplication ratios.
The Si5364 uses Silicon Laboratories’ DSPLL® technology to eliminate jitter, noise and the need for external loop filter components found in traditional PLL implementations. The DSPLL approach uses digital signal processing algorithms to replace the analog loop filter and associated discrete passive components with digital circuitry. This technology allows the Si5364 to provide selectable loop filter bandwidth settings of 800, 1600, 3200 and 6400 Hz, providing flexibility in jitter attenuation applications. Operation of the Si5364 is highly stable over process, temperature and voltage variations, producing jitter generation as low as 0.25 ps rms in OC–192 applications. The Si5364 also provides a digital hold capability that maintains a stable output clock in the event all three input clocks are lost.
The on-chip reference monitoring and clock switching functions support Stratum 2/3/3E and SMC compatible clock switching with excellent output phase transient characteristics. FEC rates are supported with selectable 15/14 or 14/15 scaling of the clock multiplication ratios. The Si5364 establishes a new standard in performance and integration for ultra-low jitter clock generation and is available in a small 11x11 mm ball grid array (BGA) package. It operates over a –20 °C to 85 °C temperature range and is powered from a single 3.3 V supply.
Si5364 Block Diagram
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