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| TRANSPORT PRODUCTS VSC7964 1/2/4 Gbps Integrated VCSEL Driver and Limiting Amplifier A P P L I C AT I O N D I A G R A M : VCSEL VSC7964 Limiting Amplifier and VCSEL Driver Tx Controls/Faults Micro Controller Two-wire interface VSC7977 Receiver Rx F E AT U R E S : Rate Selection BENEFITS: Allows the User to Optimize the Bandwidth of the Limiting Amplifier and TIA for a Given Data Rate, Improving the Optical Input Sensitivity at Lower Data Rates, and Provides Superior Interoperability with Legacy Optical Devices Automatically Adjust Bias Current, Ensuring a Constant Average Optical Power on Temperature and Time Adjustable Negative Peaking Control to Improve VCSEL Edge Speed Enables the Micro-controller to Directly Read and Write the the VSC7964 Registers, Allowing for Expanded Device Control and Enhanced Fault Coverage Eliminates the Need for External Components Saving Board Space and Simflifying the Layous Enables the Customer to Meet the International Electrotechnical Commission (IEC) Safety of Optical Fibre Communication Systems Eye Safety Epecifications. Support Industrial Temperature Applications Optical Power Monitor Dynamic Negative Peaking Control Digital Programming Interface Integrated Digital to Analog Converters (DACs) and Temp Sensor Built-in Support for IEC-60825 Eye Safety Extended Operating Temperature S P E C I F I C AT I O N S : Supported Data Rates: 1Gbps to 4.25Gbps Transmitter and Receiver Rise/Fall Time: 40ps Modulation Current: 2mA to 15mA Supply Voltage: 3.3V Operating Temperature Range from -40C to 100C (Case) SFP/SFF-8472 Compliant Disable and Faults A P P L I C AT I O N S : Gigabit Ethernet Transceivers Fibre Channel Transceivers (1x, 2x and 4x) Infiniband Transceivers PB-VSC7964-001 VSC7964 1/2/4 Gbps Integrated VCSEL Driver and Limiting Amplifier GENERAL DESCRIPTION: The VSC7964 is a multirate 4.25 Gbps integrated Vertical Cavity Surface Emitting Laser (VCSEL) driver and limiting amplifier for Gigabit Ethernet and Fibre Channel applications optimized to reduce SFP module cost. A standard SPI port is provided for programming integrated digital-to-analog converters for laser bias current, modulation current, power, modulation peaking current, and the limiting amplifier loss of signal threshold. The VSC7964 is equipped with SFP-compliant fault indicators, redundant disable control, Automatic Power Control, temperature sensor, voltage reference, various signal monitors, and robust eye safety features. A single bidirectional pin between the VSC7964 and the VSC7977 transimpedance amplifier programs the receiver bandwidth and monitors the received optical power. This allows the VSC7964 to provide an accurate indicator of received power and to select the TIA bandwidth without increasing TO-CAN pin count. The VSC7964 is available in a 6mm x 6mm 40-pin QFP-N plastic package. BLOCK DIAGRAMS: 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 741 Calle Plano Camarillo, CA 93012, USA Tel: +1 805.388.3700 Fax: +1 805.987.5896 www.vitesse.com (c)2004 Vitesse Semiconductor Corporation |
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