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VSC7939YEEV, VSC7939YEOP, VSC7940

Table of contents:
Info of VSC7939YEEV
Info of VSC7939YEOP
Info of VSC7940

VSC7939YEEV, VSC7939YEOP, VSC7940 Selling Leads, Datasheet

MFG:800 D/C:VITESSE

VSC7939YEEV, VSC7939YEOP, VSC7940 Picture

VSC7939YEEV, VSC7939YEOP, VSC7940 Datasheet download

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Part Number: VSC7939YEEV

MFG: 800

Package Cooled:

D/C: VITESSE

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VSC7940 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.

VSC7940 Maximum Ratings

Power Supply Voltage (V_CC)............................................................................................................ -0.5V to +7V
Current into BIAS.....................................................................................................................-20mA to +150mA
Current into OUT+, OUT- ...............................................................................................................................TBD
Current into MD .............................................................................................................................-5mA to +5mA
Current into FAIL ........................................................................................................................ -10mA to 30mA
Voltage at DATA+, DATA-, CLK+, CLK-, ENABLE, LATCH..................................................... -0.5V to (V_CC + 0.5V)
Voltage at APCFILT, MODSET, BIASMAX, APCSET, MD, FAIL ......................................................... -0.5V to +3.0V
Voltage at OUT+, OUT- ..................................................................................................... -0.5V to (V_CC + 1.5V)
Voltage at BIAS................................................................................................................. -0.5V to (V_CC + 0.5V)
Continuous Power Dissipation (T_A = +85°C, TQFP derate 20.8mW/°C above +85°C) .........................1350mW
Operating Junction Temperature Range ................................................................................. -55°C to +150°C
Storage Temperature Range .................................................................................................. -65°C to +165°C

VSC7940 Features

• 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

VSC7940 Typical Application

• SONET/SDH at 622Mb/s, 1.244Gb/s, 2.488Gb/s, 3.125Gb/s
• Full-Speed Fibre Channel (1.062Gb/s)

VSC7940 Connection Diagram

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