VSC8122-FECQP 查看數據表（PDF） - Vitesse Semiconductor

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VSC8122-FECQP

Multi-Rate SONET/SDH FEC Clock and Data Recovery IC

Vitesse Semiconductor 

Data Sheet

VSC8122-FEC

VITESSE

SEMICONDUCTOR CORPORATION

Multi-Rate SONET/SDH FEC

Clock and Data Recovery IC

Features

• Multi-Rate OC-3, OC-12, OC-24, OC-48 Clock

and Data Recovery

• Supports OC-48 FEC Rates

• Supports Gigabit Ethernet

• Differential Back Terminated I/O

• Maintains Clock Output in the Absence of Data

• Selectable Reference Clock

• Loss of Lock Indicator

• Exceeds SONET/SDH Requirements for Jitter

Tolerance, Jitter Transfer and Jitter Generation

• 3.3V Supply Operation

• 1W Typical Power

• 10x10 mm 64-Pin PQFP Packaging

General Description

The VSC8122-FEC is a single chip clock recovery IC for use in SONET OC-48, OC-24, OC-12, OC-3, or

Gigabit Ethernet systems operating at their respective 2.488Gb/s (up to 2.66606Gb/s FEC), 1.244Gb/s,

622Mb/s, 155Mb/s, or 1.25Gb/s data rates. It complies with SONET jitter tolerance, jitter transfer and jitter gen-

eration specifications.

Alarm functions support typical telecom system applications. The Loss of Lock (LOL) output indicates

when the device goes out of lock, which would most often occur in the event of a loss of valid data. The

NOREF output flags when the reference input to the VSC8122-FEC either is removed, or goes severely out of

tolerance.

VSC8122-FEC Block Diagram

FILTO+/- FILTI+/-

FSEL[1:0]

DI+

DI-

Ph/Freq.

Detector

Loop

Filter

VCO

Divider

CO+

CO-

REFCK1 +/-

REFCK0 +/-

Divider

Data

Retiming

Lock

Detect

DO+

DO-

LOL

NOREF

REF_INPUTSEL

REF_SEL[1:0]

G52300-0, Rev 4.1

03/01/01

© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012

Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com

Internet: www.vitesse.com

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