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VSC7940

Vitesse Semiconductor
Part Number VSC7940
Manufacturer Vitesse Semiconductor
Description SONET/SDH 3.125Gb/s Laser Diode Driver
Published Oct 10, 2007
Detailed Description www.DataSheet4U.com VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet VSC7940 Features SONET/SDH 3.125Gb/s La...
Datasheet PDF File VSC7940 PDF File

VSC7940
VSC7940

Overview
www.
DataSheet4U.
com VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet VSC7940 Features 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) • Power Supply: 5V ±5% • DC-Coupled to Laser Diode • Programmable Modulation Current: 5mA to 100mA • Programmable Bias Current: 1mA to 100mA • Enable/Disable Control • Automatic Optical Average Power Control • Modulation and Bias Current Monitors General Description The VSC7940 is a single 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, 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 VSC7940 is available in die form or in a 32-pin TQFP package.
Block Diagram VCC L AT C H IOUT+ IOUTMUX DATA+ DATACLK+ CLKCLR Q BIAS SET Q CF RF VCC D VCC ENABLE DISABLE VCC MODMON BIASMON APC MD FAIL 1nF MODSET BIASMAX CAPC APCSET G52357-0, Rev 3.
2 05/11/01 © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.
com Internet: www.
vitesse.
com Page 1 www.
DataSheet4U.
com VITESSE SEMICONDUCTOR CORPORATION SONET/SDH 3.
125Gb/s Laser Diode Driver with Automatic Power Control Preliminary Data Sheet VSC7940 Electrical Characteristics Table 1: AC Specifications AC specifications are guaranteed by design and characterization.
Typical values are for 5V operation.
Symbol tSU tH Param...


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