VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7928

SONET/SDH 3.2Gb/s Laser Diode Driver

G52246-0, Rev 3.0

Page 1

04/05/01

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

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

Internet: www.vitesse.com

Features

Applications

General Description

The VSC7928 is a single 5V supply, 3.2Gb/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 density outputs are provided to allow the user to adjust the laser bias

in high unbalanced data applications. Clock and data inputs are differentially terminated to 50

Ω.

VSC7928 Block Diagram

• Rise Times Less Than 100ps

• High Speed Operation

(Up to 3.2Gb/s NRZ Data)

• Differential or Single-Ended Inputs

• Single Supply

• ECL Compatible Clock and Data Inputs

• Direct Access to Modulation and Bias FETs

• Data Density Monitors

• On-chip Reclocking Register

• On-chip Mux for Clocked or Non-clocked Appli-

cations

• On-chip 50

Ω Input Termination: Clock and Data

• Enhanced Pinout

• SONET/SDH @ 622Mb/s, 1.244Gb/s,

2.488Gb/s, and 3.125Gb/s

• Full Speed Fibre Channel (1.062Gb/s)

MK

NMK

IBIAS

NIOUT

IOUT

MIP

VIP

VIB

MIB

DCC

*Terminated to Off-chip Capacitor

**On Die Components

M

U

X

SEL

DIN

DINTERM*

50

Ω

DQ

**

50

Ω**

NDIN

CLK

50

Ω

**

50

Ω

**

NCLK

CLKTERM*