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VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7940

Features

SONET/SDH 3.125Gb/s

Laser Diode Driver with Automatic Power Control

Applications

鈥?SONET/SDH at 622Mb/s, 1.244Gb/s,

2.488Gb/s, 3.125Gb/s

鈥?Full-Speed Fibre Channel (1.062Gb/s)

鈥?Power Supply: 5V

鹵

5%

鈥?DC-Coupled to Laser Diode

鈥?Programmable Modulation Current: 5mA to 100mA

鈥?Programmable Bias Current: 1mA to 100mA

鈥?Enable/Disable Control

鈥?Automatic Optical Average Power Control

鈥?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

漏

VITESSE

SEMICONDUCTOR CORPORATION

鈥?741 Calle Plano 鈥?Camarillo, CA 93012

Tel: (800) VITESSE 鈥?FAX: (805) 987-5896 鈥?Email: prodinfo@vitesse.com

Internet: www.vitesse.com

Page 1

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