VSC8238 データシートの表示（PDF） - Vitesse Semiconductor

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VSC8238

10.3125 Gbps Advanced Electronic Equalization with Limiting Amplifier, and Clock and Data Recovery

Vitesse Semiconductor 

VSC8238

10.3125 Gbps Advanced Electronic Equalization with Limiting Amplifier, and Clock and Data Recovery

GENERAL DESCRIPTION:

The VSC8238 device is a compact, fully integrated

electronic dispersion compensator (EDC) and

provides clock and data recovery (CDR) unit

VSC8238

incorporating a sophisticated feed-forward

equalization (FFE) and decision feedback

equalization (DFE) architecture. The device is

designed to operate at 10.3125 Gbps for use in 10GBASE-LRM Ethernet

applications. The receive chain within the VSC8238 device incorporates a

low-noise automatic gain-controlled amplifier, a high-speed adaptive

equalizer with linear and nonlinear compensation, a jitter-tolerant clock

and data recovery, and a precision-limiting amplifier. The 10.3125 Gbps

output signal is XFI-compliant. The equalizer implementation provides a

high level of signal impairment compensation to ensure a robust LRM link.

It also provides the adequate performance margin needed for demanding

multimode fiber applications. The VSC8238 device is the only EDC on the

market meeting the LX-4 compliant performance to enable 10 GbE

transmission up to 300 meters on 99% of the installed FDDI fiber base.

VSC8238 STRESSOR ELECTRICAL PERFORMANCE:

IEEE802.3aq/D3.1 220 m post-cursor, pre-cursor, and split-symmetric

stressor performance as a function of log BER versus SNR

(nominal conditions, input: ~400 mV differential)

–4

–5

–6

–7

–8

–9

–10

–11

–12

Split-Symmetric Passing Region

–13

Pre-Cursor Passing Region

–14

Post-Cursor Passing Region

–15

220 m Post-Cursor

220 m Pre-Cursor

220 m Split-Symmetric

Split-Symmetric SNR

Pre-Cursor SNR

Post-Cursor SNR

BER

21

23

25

27

29

31

33

35

SNR (dBe)

SPECIFICATIONS:

` Exceeds IEEE 802.3aq Draft 4.0 specifications for 10GBASE-LRM performance

` Passes the following LRM stressor tests:

- Split-symmetric 4.75 dB PIE-D stressor (300 m)

- Post-cursor 4.56 dB PIE-D stressor (300 m)

- Pre-cursor 4.48 dB PIE-D stressor (300 m)

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 © 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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