VITESSE

SEMICONDUCTOR CORPORATION

G52203-0, Rev 3.0

Page 1

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

Preliminary Data Sheet

VSC7923

SONET/SDH 2.5Gb/s Laser Diode Driver

Features

Applications

General Description

The VSC7923 is a single 5V supply, 2.4 Gb/s laser diode driver with direct access to the laser modulation and

bias FET’s. Laser bias and modulation currents are set by external components allowing precision monitoring

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.

VSC7923 Block Diagram

• Rise Times Less Than 100ps

• High Speed Operation (Up to 2.4Gb/s NRZ Data)

• Single-Ended or Differential Input Operation

• Single Power Supply

• Direct Access to Modulation and Bias FETs

• Data Density Monitors

• SONET/SDH at 622Mb/s, 1.244Gb/s,

2.488Gb/s, 3.125Gb/s

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

DIN

VREF

MK

NMK

IBIAS

NIOUT

IOUT

VIP

VIB

MIP

MIB

IMOD