VITESSE

SEMICONDUCTOR CORPORATION

G52156-0, Rev 3.0

Page 1

05/01/01

© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012

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

Internet: www.vitesse.com

Preliminary Data Sheet

VSC7924

SONET/SDH 2.5Gb/s Laser Diode Driver

Features

Applications

General Description

The VSC7924 is a single 5V supply, 2.5Gb/s laser diode driver with direct access to the laser modulation

and bias FETs. Laser bias and modulation currents are set by external components allowing precision monitor-

ing and setting of the current levels. Data inputs accept ECL levels. Data density outputs are provided to allow

the user to adjust the laser bias in high unbalanced data applications.

VSC7924 Block Diagram

• Rise Times Less Than 100ps

• High-Speed Operation

(Up to 2.5Gb/s NRZ Data)

• Single-Ended Operation

• Single Power Supply

• Direct Access to Modulation and Bias FETs

• Data Density Monitors

• 24-Pin Ceramic Package

• SONET/SDH at 622Mb/s, 1.244Gb/s, and 2.488Gb/s

• Full-Speed Fibre Channel (1.062Gb/s)

DIN

VREF

MK

NMK

IBIAS

NIOUT

IOUT

VIP

VIB

MIP

MIB

*Terminated to Off-chip Capacitor

IMOD

*TERM