VSC8238
10.3125 Gbps Advanced Electronic Equalization with Limiting Amplifier, and Clock and Data Recovery
G E N E R A L D E S C R I P T I O N :
The VSC8238 device is a compact, fully integrated
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.
electronic dispersion compensator (EDC) and
provides clock and data recovery (CDR) unit
incorporating
a
sophisticated feed-forward
VSC8238
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
V S C 8 2 3 8 S T R E S S O R E L E C T R I C A L P E R F O R M A N C E :
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
220 m Post-Cursor
220 m Pre-Cursor
220 m Split-Symmetric
Split-Symmetric SNR
Pre-Cursor SNR
Post-Cursor SNR
BER
–7
–8
–9
–10
–11
–12
–13
–14
–15
Split-Symmetric Passing Region
Pre-Cursor Passing Region
Post-Cursor Passing Region
21
23
25
27
29
31
33
35
SNR (dBe)
S P E C I F I C A T I O N S :
` 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.
741 Calle Plano
Camarillo, CA 93012, USA
Tel: +1 805.388.3700
Fax: +1 805.987.5896
www.vitesse.com
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.
sales@vitesse.com
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