VSC7960 查看數據表（PDF） - Vitesse Semiconductor

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VSC7960

3.125Gb/s CML Limiting Amplifier with LOS Detect and Laser Driver with Automatic Power Control

Vitesse Semiconductor 

VITESSE

SEMICONDUCTOR CORPORATION

Advance Product Information

VSC7960

3.125Gb/s CML Limiting Amplifier with LOS Detect

and Laser Driver with Automatic Power Control

Features

• 3.3V Power Supply

• Laser Driver AC-Coupled to Laser Diode

• Programmable Laser Driver Modulation Current

from 5mA to 60mA

• Programmable Laser Driver Bias Current from

1mA to 100mA

• Laser Driver Enable Control

• Automatic Optical Average Power Control

• Supply Current of 80mA

• CML Limiting Amplifier Outputs

• Packages: 48-Pin TQFP, Bare Die

Applications

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

and 3.125Gb/s

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

General Description

The VSC7960 is a single 3.3V supply combination limiting amplifier and laser diode driver for

SONET/SDH applications up to 3.125Gb/s. The limiting amplifier features Loss of Signal (LOS) detect, output

offset correction, and optional output squelch. Laser driver data inputs accept differential PECL signals and the

output modulation and bias currents are easily controlled via external components. The laser diode driver Auto-

matic 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 con-

trol, short-circuit protection for the modulation and bias inputs, short rise and fall times, and failure-monitor

output to indicate when the APC loop is unable to maintain the average optical power. The VSC7960 is avail-

able in die form or in a 48-pin TQFP package. The VSC7962 provides similar features to the VSC7960 but the

limiting amplifier has PECL outputs.

Block Diagram

DATA+

DATA-

LAO+

LAO-

VSC7960

VSC7939

Laser Driver

OUT+

OUT-

VSC7959

Limiting Amplifier

IN+

IN-

G52359-0, Rev 2.1

5/01/01

© 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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