XRT91L33IG Просмотр технического описания (PDF) - Exar Corporation

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XRT91L33IG

STS-12/STS-3 MULTIRATE CLOCK AND DATA RECOVERY UNIT

Exar Corporation 

XRT91L33

STS-12/STS-3 MULTIRATE CLOCK AND DATA RECOVERY UNIT

AUG 2008

REV. V1.0.0

FEATURES

• Performs clock and data recovery for selectable

data of 622.08 Mbps (STS-12/STM-4) or 155.52

Mbps (STS-3/STM-1) NRZ data

• Meets Telcordia, ANSI and ITU-T G.783 and G.825

SDH jitter requirements including T1.105.03 - 2002

SONET Jitter Tolerance specification, and GR-253

CORE, GR-253 ILR SONET Jitter specifications.

• Lock output pin monitors data run length and

frequency drift from reference clock

• Data is resampled at the output

• Active High Signal Detect (SIGD) LVPECL input

• Low jitter, high-speed outputs support LVPECL and

low-power LVDS termination

• 19.44 MHz reference frequency LVTTL input

• Low power: 215 mW typical

• 3.3V power supply

• 20-pin TSSOP package

• Requires one external capacitor

• PLL bypass operation facilitates board debug

process

• ESD greater than 2kV on all pins

APPLICATIONS

• SONET/SDH-based Transmission Systems

• Add/Drop Multiplexers

• Cross Connect Equipment

• ATM and Multi-Service Switches, Routers and

Switch/Routers

• DSLAMS

• SONET/SDH Test Equipment

• DWDM Termination Equipment

GENERAL DESCRIPTION

The XRT91L33 is a fully integrated multirate Clock

and Data Recovery (CDR) device for SONET/SDH

622.08 Mbps STS-12/STM-4 or 155.52 Mbps STS-3/

STM-1 applications. The device provides Clock and

Data Recovery (CDR) function by synchronizing its

on-chip Voltage Controlled Oscillator (VCO) to the

incoming serial scrambled non-return to zero (NRZ)

data stream. Figure 1 shows the block diagram of

the XRT91L33.

FIGURE 1. BLOCK DIAGRAM OF XRT91L33

STS12_MODE

REFCK

19.44 MHz

CAP+

1u F

CAP+

TEST

RX LOOP

FILTER

RXDIP

RXDIN

External

100R

termination

Differential

Receiver

RXDATAIN

Internal

biasing

LCKTOREFN

SIGD

PLL

CDR

STS-12/3

or

STM-4/1

Clock and Data

Recovery

LVDS/LVPECL

RECVD- Output Drivers

DATAOUT

0

1

RECVD-

CLKOUT

MUTE

RXDO

RXDOP

RXDON

RXCLKOP

RXCLKON

LOCK

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com

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