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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VSC7718, VSC7728

VSC7728

VSC7718

VOUTN

TIA

VOUTP

VCC

PD

APD

Supply

GND

LOUTN

LOUTP

RESETP

LINN

LINP

LA

VCC

GND

INTERNAL

RESET

Incoming

RESET

Signal

Outgoing

RESET

Signall Block

IN

FILTER

RTHAD

DATRDYP

RESET Signal from OLT MAC

(Data Ready Indicator for CDR)

DATRDYN

RESETN

Signal Detect

Threshold Adjust

Block

RMON

GENERAL DESCRIPTION:

The VSC7718 transimpedance amplifier (TIA) and VSC7728 post amplifier

together form a complete chipset solution for Gigabit-capable Passive

Optical Networks (GPON) and Gigabit Ethernet Passive Optical Networks

(GE-PON) OLT burst-mode receivers. This chipset exceeds GPON

requirements with better than –33 dBm sensitivity, industry-leading

overload performance of better than –4 dBm and over 23 dBm of dynamic

range.

Designed to be used in conjunction with one another, the VSC7728

supplies a reset signal to the VSC7718 in order to control its internal offset

correction circuitry, providing fast settling times with immunity to long

streams of consecutive identical digits. The VSC7718 also features a

space-saving filter connection provided for positive bias to a PIN diode

through a filter resistor to VCC.

The VSC7718 is available as bare die with padout optimized for standard

4-pin, 5-pin and 6-pin TO-46 packages. The VSC7728 is available in a

16-pin, 3mm x 3mm QFP package.

BLOCK DIAGRAM:

GPON and GE-PON OLT Transimpedance Amplifier and Limiting Amplifier Chipset