GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3

Tel. +1 (905) 632-2996

Fax. +1 (905) 632-5946

E-mail: info@gennum.com

www.gennum.com

Revision Date: November 2000

Document No. 522 - 80 - 00

PRELIMINARY DATA SHEET

FEATURES

• SMPTE 259M-C compliant (270Mb/s)

• automatic cable equalization (typically greater than

350m of high quality cable)

• serial data outputs muted and serial clock remains

active when input data is lost

• operation independent of SAV/EAV sync signals

• signal strength indicator output

• carrier detect with programmable threshold level

• power savings mode (output serial clock disable)

• large IJT, typically 0.56UI beyond loop bandwidth

• robust lock detect

APPLICATIONS

Cable equalization plus clock and data recovery for all high

speed serial digital interface applications involving SMPTE

259M-C.

DESCRIPTION

The GS7025 provides automatic cable equalization and

high performance clock and data recovery for serial digital

signals. The GS7025 receives either single-ended or

differential serial digital data and outputs differential clock

and retimed data signals at PECL levels (800mV). The on-

board cable equalizer provides up to 35dB of gain at

135MHz which typically results in equalization of greater

than 350m of high quality cable at 270Mb/s.

The GS7025 requires only one external resistor to set the

VCO centre frequency and provides adjustment free

operation.

The GS7025 has dedicated pins to indicate signal

strength, carrier detect, and LOCK. Optional external

resistors allow the carrier detect threshold level to be

customized to the user's requirement. In addition, the

GS7025 provides an 'Output Eye Monitor Test' (OEM_TEST)

for diagnostic testing of signal integrity after equalization,

prior to reslicing. The serial clock outputs can also be

disabled to reduce power. The GS7025 operates from a

single +5 or -5 volt supply.

BLOCK DIAGRAM

ORDERING INFORMATION

PART NUMBER

PACKAGE

TEMPERATURE

GS7025-CQM

44 pin MQFP Tray

0°C to 70°C

GS7025-CTM

44 pin MQFP Tape

0°C to 70°C

LF+ LFS LF-

CARRIER DETECT

PHASELOCK

HARMONIC

FREQUENCY

ACQUISITION

VCO

LOCK

SDO

SDO

CLK_EN

SCO

SCO

MUTE

PHASE

DETECTOR

LOGIC

+

-

SDI

SDI

OEM_TEST

AGC CAP CD_ADJ

AUTO EQ

CONTROL

EYE

MONITOR

VARIABLE

GAIN EQ

STAGE

CHARGE

PUMP

+

-

+

-

SSI/CD

A/D

ANALOG

DIGITAL

MUX

DDI

DDI

Serial Digital Receiver