GS2974A Datasheet PDF - Gennum

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GS2974A
Gennum

Part Number GS2974A
Description HD-LINX III Adaptive Cable Equalizer
Page 16 Pages


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GS2974A HD-LINX™ III Adaptive Cable Equalizer
Features
• SMPTE 424M, SMPTE 292M and SMPTE 259M
compliant
• Automatic cable equalization
• 0.3UI Maximum Output Jitter at 2.97Gb/s
• 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: 120m
at 2.97Gb/s, 200m at 1.485Gb/s, and 350m 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
Applications
• SMPTE 424M, SMPTE 292M and SMPTE 259M Coaxial
Cable Serial Digital Interfaces.
Description
The GS2974A is a high-speed BiCMOS integrated circuit
designed to equalize and restore signals received over 75Ω
co-axial cable.
The GS2974A 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 GS2974A 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 GS2974A output when an approximate
selected cable length is reached for SMPTE 259M signals.
This feature allows the GS2974A to distinguish between
low amplitude SD-SDI signals and noise at the input of the
device. The serial digital outputs of the GS2974A 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 GS2974A is lead-free, and the
encapsulation compound does not contain halogenated
flame retardant.
This component and all homogeneous subcomponents are
RoHS compliant.
MCLADJ
SDI
SDI
CABLE LENGTH ADJUSTOR
CARRIER
DETECT MUTE
EQUALIZER
DC RESTORE
OUTPUT
AGC
GS2974A Functional Block Diagram
GS2974A HD-LINX™ III Adaptive Cable Equalizer
Data Sheet
42216 - 3
January 2009
www.gennum.com
CD
MUTE
BYPASS
SDO
SDO
1 of 16
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