GS2974B Datasheet, PDF (1/17 Pages) Gennum Corporation – HD-LINX III Adaptive Cable Equalizer

GS2974B HD-LINX™ III Adaptive Cable Equalizer
Features
• SMPTE 424M, SMPTE 292M, 344M and SMPTE 259M
compliant
• Automatic cable equalization
• Multi-standard operation from 143Mb/s to 2.97Gb/s
• Supports DVB-ASI at 270Mb/s
• Small footprint (4mm x 4mm)
• Pb-free and RoHS compliant
• Manual bypass (useful for low data rates with slow
rise/fall times)
• Performance optimized for 1.485Gb/s and 2.97Gb/s
• Typical equalized length of Belden 1694A cable: 140m
at 2.97Gb/s, 230m at 1.485Gb/s, and 250m at 270Mb/s
• 50Ω differential output (internal 50Ω pull-ups)
• Programmable mute based on max cable length adjust
• Single 3.3V power supply operation
• Operating temperature range: 0°C to +70°C
• Footprint compatible with GS2974A and GS1574A
Applications
• SMPTE 424M, SMPTE 292M and SMPTE 259M Coaxial
Cable Serial Digital Interfaces.
Description
The GS2974B is a high-speed BiCMOS integrated circuit
designed to equalize and restore signals received over 75Ω
co-axial cable.
The GS2974B is designed to support SMPTE 424M, SMPTE
292M and SMPTE 259M, and is optimized for performance
at 1.485Gb/s and 2.97Gb/s.
The GS2974B features DC restoration to compensate for the
DC content of SMPTE pathological test patterns.
A voltage programmable mute threshold (MCLADJ),
applicable for SD mode (refer to Section 4.3), is included to
allow muting of the GS2974B output when an approximate
selected cable length is reached for SMPTE 259M signals.
This feature allows the GS2974B to distinguish between
low amplitude SD-SDI signals and noise at the input of the
device. The serial digital outputs of the GS2974B may be
forced to a mute state by applying a voltage to the MUTE
pin.
Power consumption is typically 215mW using a 3.3V
power supply. The GS2974B is lead-free, and the
encapsulation compound does not contain halogenated
flame retardant.
This component and all homogeneous subcomponents are
RoHS compliant.
MCLADJ
CABLE LENGTH ADJUSTOR
CARRIER DETECT
MUTE
SDI
EQUALIZER
SDI
DC RESTORE
OUTPUT
AGC
GS2974B Functional Block Diagram
GS2974B GS2974B HD-LINX™ III Adaptive Cable
Equalizer
Data Sheet
45062 - 3
April 2009
www.gennum.com
CD
MUTE
BYPASS
SDO
SDO
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