TRANSPORT PRODUCTS
VSC1237, VSC1238
9.9 to 12.5 Gbps 16:1 Multiplexer with Clock Multiplier Unit and Demultiplexer with Clock Recovery Chip Set
BENEFITS: VSC1237 Full or Half-rate Clock output for use with Clocked Laser Drivers or in RZ Signal Generation Built in Jitter Filter PLL Extremely Low Clock-data Skew Clock Outputs can be Disabled to Save Power Flexible Parallel Data Clocking Using Internal PLL A P P L I C AT I O N S : SONET OC-192, SDH STM-64 Systems 10GbE, G.975, G.709 and Proprietary FEC Systems Long Haul / Ultra Long Haul Transmission Systems Line Cards Transponders F E AT U R E S : VSC1237 16:1 Data Multiplexer PLL Based Clock Multiplier Integrated Jitter Filter PLL Full-rate/Half-rate Clock Outputs Flexible PLL Based Parallel Data Clocking Selectable Bit-order and Phase Reversal Selectable Low Phase Noise VCOs Surpasses SONET/SDH Jitter Generation/Transfer Requirements VSC1238 1:16 Data Demultiplexer PLL Based Clock Recovery Highly Sensitive Front-end: 8mVpp Single-ended Powerful Adaptive Threshold Control Features Surpasses SONET/SDH Jitter Tolerance Requirements Reference Multiplier PLL True Loss of Signal Function Direct Recovery of NRZ and RZ Signals Common Features Low Power SiGe Technology No External Heatsink Required Single 3.3V Power Supply Common Specifications LVDS Compatible Low-speed I/O -5 to +90C Case Temperature Range PB-VSC1237,38-001 VSC1238 1.7W Typical Power Dissipation 8mVpp Single-ended Sensitivity 3mV Maximum Uncorrected Input Referred Offset Multi-frequency Capable with Selectable CDR VCOs Auto-sensing /16, /64 or /512 Reference Frequency 560mVpp Typical Data Output Amplitude 25ps Typical Rise/Fall Time 600mVpp Typical Clock Amplitude <-10dB Output Return Loss <0.1UIpp Jitter Generation 5ps Typical Clock-data Skew Variation No External Heatsink Required VSC1238 High Sensitivity Eliminates Need for AGC/Post-amplifier Adaptive Threshold Control Features to Optimize BER Proven Performance with Degraded/Difficult Signals Such as: - Poor OSNR - Chromatic Dispersion - Differential Group Delay - RZ Signaling S P E C I F I C AT I O N S : VSC1237 1.2W Typical Power Dissipation
VSC1237, VSC1238
9.9 to 12.5 Gbps 16:1 Multiplexer with Clock Multiplier Unit and Demultiplexer with Clock Recovery Chip Set
GENERAL DESCRIPTION: The VSC1237 and VSC1238 is a complete highperformance multiplexer/demultiplexer chip set designed for 9.9-12.5 Gbps applications, including SONET OC-192, SDH STM-64, 10GbE, G.975, G.709 and offering enhanced capabilities specifically designed to address the needs of Ultra Long Haul (ULH) and Long Haul (LH) fiber optic transmission systems. The VSC1237 is a 16:1 Multiplexer with an integrated Clock Multiplier Unit. This device easily surpasses the jitter requirements for SONET/SDH transmission systems. Integrated phase locked loop circuits, including VCOs, are used for high speed clock generation, jitter filtering and low-speed data transfer. This device offers enhanced features, such as a integrated jitter filter PLL and a selectable full/half-rate clock output, which is specifically designed to be used in long haul and ultra long haul systems that utilize clocked laser drivers or RZ signaling. The clock output features extremely low clock-data skew variation, and can be disabled to save power. The VSC1238 is a 1:16 Demultiplexer (DMUX) with Clock and Data Recovery (CDR) unit. This device is capable of direct recovery of signals which are subject to various impairments/formats inherent in ULH/LH systems, including poor Optical Signal to Noise Ratio (OSNR) arising from optical amplification, distortion from Chromatic Dispersion, Polarization Mode Dispersion / Differential Group Delay (PMD/DGD), and RZ signaling. The highly sensitive front-end, precise phase detector / decision circuit, and adaptive threshold features eliminate the need for AGC amplifiers, post-amplifiers, filters, etc. which are traditionally needed to recover these signals. VSC1238 BLOCK DIAGRAMS: VSC1237
For more information on Vitesse Products visit the Vitesse web site at www.vitesse.com or contact Vitesse Sales at (800) VITESSE or sales@vitesse.com
(c)2004 Vitesse Semiconductor Corporation Vitesse, ASIC-Friendly, FibreTimer, TimeStream and Snoop Loop are trademarks of Vitesse Semiconductor Corporation. All other trademarks or registered trademarks mentioned herein are the property of their respective holders. Vitesse Semiconductor Corporation ("Vitesse") retains the right to make changes to its products or specifications to improve performance, reliability or manufacturability. All information in this document, including descriptions of features, functions, performance, technical specifications and availability, is subject to change without notice at any time.
741 Calle Plano Camarillo, CA 93012, USA Tel: +1 805.388.3700 Fax: +1 805.987.5896 www.vitesse.com
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