Trademarks

TM

Vitesse, ASIC-Friendly, FibreTimer, TimeStream, Snoop Loop, Super FEC, FOCUSConnect, Meigs-II, Meigs-IIe, Lansing, Campbell-I, Barrington,

PaceMaker, HOVCAT48, HOVCAT48e, HOVCAT192, HOVCAT192e, Micro PHY, FOCUS32, FOCUS16, IQ2200, NexSAS, VersaCAT, GigaStream, HawX,

SparX, StaX, VstaX, SimpliPHY,VeriPHY, ActiPHY, XFP PRO, SFP PRO, Smart-LINK, OctalMAC, EQ Technology are trademarks in the United States and/or

other jurisdictions of Vitesse Semiconductor Corporation. All other trademarks or registered trademarks mentioned herein are the property of their respective

holders.

Vitesse Semiconductor Corporation (“Vitesse”) retains the right to make changes to its products or specifications to improve performance, reliability or

manufacturability. All information in this document, including descriptions of features, functions, performance, technical specifications and availability, is

subject to change without notice at any time. While the information furnished herein is held to be accurate and reliable, no responsibility will be assumed by

Vitesse for its use. Furthermore, the information contained herein does not convey to the purchaser of microelectronic devices any license under the patent

right of any manufacturer.

Copyright © 2006

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Tel: +1 805.388.3700

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VSC7967

VSC7967

Laser Driver

DATA

Modulation and

Bias Control and Montoring

DATAN

OUT

OUTN

5

Ω

15

Ω

BSRC

VCC

IMOD

IMOD

BEN

15

Ω

BENN_TX_DIS

VCC

15

Ω

5

Ω

BSNK

AOUT

10 k

Ω

MD

TX_FAULT

IBIAS

BSNKN

IMD

10 k

Ω

VCC

Limiting Amplifier

LIN

S1

LOUT

50

Ω

LOUTN

S5

DCRST2

Peak

Detector

and

Control

50

Ω

LOS

100

Ω

S2

S4

S3

DCRST1

RPK_STAGE

DCRST[1:0]

DCRST[1:0]

LA_SQMON

LOSMON

Output

Control

LA_SQSRC

LA_SQFORCE

7 k

Ω

VCC

GENERAL DESCRIPTION:

BLOCK DIAGRAMS:

PON Integrated Burst-mode Laser Driver and Limiting Amplifier

The VSC7967 is a multirate 1.25 Gbps integrated

laser driver and 2.5 Gbps limiting amplifier for

Passive Optical Network applications optimized

to reduce module cost. The device is intended to

drive distributed feedback (DFB) and Fabry Perot

(FP) lasers. A standard SPI port is provided for programming

integrated digital-to-analog converters for laser bias current,

modulation current, average power, and the limiting amplifier loss of

signal threshold. The VSC7967 is equipped with SFP-compliant fault

indicators, redundant disable control, Automatic Power Control,

temperature sensor, various signal monitors, and robust eye safety

features. The VSC7967 is available in a 5mm x 5mm 32-pin QFN

plastic package.