VSC7925 View Datasheet(PDF) - Vitesse Semiconductor

Part Name

Description

Manufacturer

VSC7925

SONET/SDH 2.5Gb/s Laser Diode Driver

Vitesse Semiconductor 

VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7925

SONET/SDH 2.5Gb/s Laser Diode Driver

Features

• Rise Times Less Than 100ps

• High Speed Operation (Up to 2.5Gb/s NRZ Data)

• Single-ended Inputs

• Single Supply

• Direct Access to Modulation and Bias FET’s

• Data Density Monitors

• On-Chip Reclocking Register

• 24-Pin Ceramic Package

Applications

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

2.488Gb/s

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

General Description

The VSC7925 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 density outputs are provided to allow the user to adjust the laser bias

in unbalanced data applications. Clock and data inputs have nominal 50Ω termination resistors and high fre-

quency decoupling capacitors.P

VSC7925 Block Diagram

DIN

50Ω **

NDIN*

10pF **

DQ

CLK

50Ω **

NCLK*

10pF **

* Terminated to off-chip capacitor

** On-die components

MK

NMK

DCC

DCC

VIP

VIB

IOUT

NIOUT

IBIAS

IMOD

IBIAS

MIP

MIB

G52157-0, Rev 3.2

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

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