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VSC7939

Vitesse Semiconductor
Part Number VSC7939
Manufacturer Vitesse Semiconductor
Description Laser Diode Driver
Published Oct 10, 2007
Detailed Description www.DataSheet4U.com VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet VSC7939 Features • Power Supply: 3.3V or...
Datasheet PDF File VSC7939 PDF File

VSC7939
VSC7939

Overview
www.
DataSheet4U.
com VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet VSC7939 Features • Power Supply: 3.
3V or 5V ±5% • AC-Coupled to Laser Diode SONET/SDH 3.
125Gb/s Laser Diode Driver with Automatic Power Control Applications • SONET/SDH at 622Mb/s, 1.
244Gb/s, 2.
488Gb/s, 3.
125Gb/s • Full-Speed Fibre Channel (1.
062Gb/s) • Programmable Modulation Current: 5mA to 60mA • Programmable Bias Current: 1mA to 100mA • Enable /Disable Control • Typical Rise/Fall Times of 60ps • Automatic Optical Average Power Control • Supply Current of 33mA at 3.
3V General Description The VSC7939 is a single 3.
3V or 5V supply laser diode driver specially designed for SONET/SDH applications up to 3.
125Gb/s.
External resistors set a wide range of bias and modulation currents for driving the laser.
Data and clock inputs accept differential PECL signals.
The automatic power control (APC) loop maintains a constant average optical power over temperature and lifetime.
The dominant pole of the APC loop can be controlled with an external capacitor.
Other features include enable/disable control, short-circuit protection for the modulation and bias inputs, short rise and fall times, programmable slow-start circuit to set laser turn-on delay, and failure-monitor output to indicate when the APC loop is unable to maintain the average optical power.
The VSC7939 is available in die form or in a 32-pin TQFP package.
Block Diagram 3.
3V Operation LP IOUT+ IOUTMUX DATA+ DATACLK+ CLKD SET VCC LATCH CD CF RF VCC Q CLR Q BIAS VCC ENABLE DISABLE APC MD FAIL MODSET BIASMAX CAPC APCSET 1nF VCC MODMON BIASMON G52350-0, Rev 3.
2 02/26/01 © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.
com Internet: www.
vitesse.
com LP Page 1 www.
DataSheet4U.
com VITESSE SEMICONDUCTOR CORPORATION SONET/SDH 3.
125Gb/s Laser Diode Driver with Automatic Power Control Preliminary Data Sheet VSC7939 Electrical Characteris...


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