EEWORLDEEWORLDEEWORLD

Part Number

Search

VSC7940

Description
SONET/SDH 3.125Gb/s Laser Diode Driver with Automatic Power Control
File Size170KB,16 Pages
ManufacturerVitesse Semiconductor Corporation
Websitehttp://www.vitesse.com/
Download Datasheet Compare View All

VSC7940 Overview

SONET/SDH 3.125Gb/s Laser Diode Driver with Automatic Power Control

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 opti-
cal power. The VSC7940 is available in die form or in a 32-pin TQFP package.
Block Diagram
V
CC
L AT C H
IOUT+
IOUT-
MUX
DATA+
DATA-
CLK+
CLK-
CLR
Q
BIAS
SET
Q
C
F
R
F
V
CC
D
V
CC
ENABLE
DISABLE
V
CC
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

VSC7940 Related Products

VSC7940 VSC7940RP VSC7940W
Description SONET/SDH 3.125Gb/s Laser Diode Driver with Automatic Power Control SONET/SDH 3.125Gb/s Laser Diode Driver with Automatic Power Control SONET/SDH 3.125Gb/s Laser Diode Driver with Automatic Power Control
Maker - Vitesse Semiconductor Corporation Vitesse Semiconductor Corporation
Parts packaging code - QFP DIE
package instruction - TFQFP, TQFP32,.28SQ DIE,
Contacts - 32 48
Reach Compliance Code - unknow unknow
Interface integrated circuit type - INTERFACE CIRCUIT INTERFACE CIRCUIT
JESD-30 code - S-PQFP-G32 R-XUUC-N48
Number of functions - 1 1
Number of terminals - 32 48
Maximum operating temperature - 85 °C 85 °C
Minimum operating temperature - -40 °C -40 °C
Package body material - PLASTIC/EPOXY UNSPECIFIED
encapsulated code - TFQFP DIE
Package shape - SQUARE RECTANGULAR
Package form - FLATPACK, THIN PROFILE, FINE PITCH UNCASED CHIP
Certification status - Not Qualified Not Qualified
Maximum supply voltage - 5.25 V 5.25 V
Minimum supply voltage - 4.75 V 4.75 V
Nominal supply voltage - 5 V 5 V
surface mount - YES YES
Temperature level - INDUSTRIAL INDUSTRIAL
Terminal form - GULL WING NO LEAD
Terminal location - QUAD UPPER
Dean of Tongji University School of Software talks about career choice - about embedded systems
2. About the direction of embedded systems Embedded systems are undoubtedly one of the hottest and most promising IT application fields. Embedded systems are used on some specific dedicated devices. U...
亲善大使 Embedded System
Help
I need a circuit diagram urgently. It requires AT89C52 control, 2 1M flash memory, an EEPROM, 4*4 keyboard, 8 LED digital display, an RS232 interface, and needs to be controlled by IIC. Please help me...
黎江媚 MCU
Tutorial on generating negative voltage using MCU's PWM
We should know that there is a switching power supply that is realized by PWM wave, but do you know that negative voltage can also be output through PWM wave?Negative voltage generation circuit diagra...
火辣西米秀 Microcontroller MCU
Has anyone used the RTX real-time extensions under Windows?
I've been developing simulation software recently, which requires strong real-time performance. In order to facilitate development and user use, I don't want to change the operating system. I saw that...
mj20002008 Embedded System
【CN0193】A high-voltage (30V) DAC powered from a low-voltage (3V) supply generates tuning signals for antennas and filters
Circuit Function and Advantages The circuit shown in Figure 1 generates a high voltage signal that controls the capacitance of a BST (barium strontium titanate) capacitor. The BST capacitance can be c...
EEWORLD社区 ADI Reference Circuit
I haven't finished taking screenshots of my C2000 learning progress! I hope there will be another chance.
I have been studying this hard these days! I have studied it several times. Because I finished studying early and did the exercises early, I only read the materials later. I didn’t expect that I forgo...
wuyanyanke Microcontroller MCU

EEWorld
subscription
account

EEWorld
service
account

Automotive
development
circle

Robot
development
community

Index Files: 293  461  2098  2181  1576  6  10  43  44  32 
Datasheet   0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Room 1530, 15th Floor, Building B, No. 18 Zhongguancun Street, Haidian District, Beijing Telephone: (010) 82350740 Postal Code: 100190
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved 京ICP证060456号 京ICP备10001474号-1 电信业务审批[2006]字第258号函 京公网安备 11010802033920号