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VSC7718, VSC7728
GPON and GE-PON OLT Transimpedance Amplifier and Limiting Amplifier Chipset
VSC7728 VSC7718
F E AT U R E S : Burst average received power monitor Reset through the high-speed data interface Fast settling time Differential Data Ready (DATRDYP, DATRDYN) output LVPECL outputs Bare die or 16-pin 3 mm x 3 mm QFP package
BENEFITS: Enables the system to monitor the burst power to determine if there are any issues with the ONU transmission Reduces pin count for the BOSA Enables the receiver to meet GPON settling-time requirements Used to latch the receive power monitor as well as tell the downstream CDR when to start acquiring good data Standard interface that directly couples to the CDR Small enough to fit in a SFF or SFP module along with a laser driver to achieve a complete solution
A P P L I C AT I O N S : GPON - G.984 1244 Mbps upstream, class A, B, B+, and C GE-PON - IEEE Std. 802.3ah (EFM), 1000BASE-PX10/20-U (GE-PON OLT)
S P E C I F I C AT I O N S : 3.3 V power supply
VPPD-01548 Revision 1.0
VSC7718, VSC7728
GPON and GE-PON OLT Transimpedance Amplifier and Limiting Amplifier Chipset
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:
RESET Signal from OLT MAC VCC APD Supply RESETP RESETN RTHAD VCC
VSC7718
VSC7728
Signal Detect Threshold Adjust Block VOUTP LINP Outgoing RESET Signall Block LA LOUTN
FILTER PD IN Incoming RESET Signal INTERNAL RESET
LOUTP
TIA
VOUTN
LINN
GND
RMON
DATRDYP
DATRDYN
GND
(Data Ready Indicator for CDR)
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. Copyright (c) 2006 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.
741 Calle Plano Camarillo, CA 93012, USA Tel: +1 805.388.3700 Fax: +1 805.987.5896 www.vitesse.com sales@vitesse.com

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