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Semtech - Dual Output Adaptive Cable Equalizer

Numéro de référence GS2993
Description Dual Output Adaptive Cable Equalizer
Fabricant Semtech 
Logo Semtech 





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GS2993 fiche technique
GS2993
Dual Output Adaptive Cable Equalizer
Key Features
• SMPTE 424M, SMPTE 292M and SMPTE 259M
compliant
• Automatic cable equalization
• Multi-standard operation from 143Mb/s to 2.97Gb/s
• Performance optimized for 270Mb/s, 1.485Gb/s and
2.97Gb/s. Typical equalized length of Belden 1694A
cable:
Š 140m at 2.97Gb/s
Š 220m at 1.485Gb/s
Š 400m at 270Mb/s
• Supports DVB-ASI at 270Mb/s
• Dual, independently-controlled outputs
• Manual bypass (useful for low data rates with slow
rise/fall times)
• Programmable carrier detect with squelch threshold
adjustment
• Automatic power-down on loss of signal
Š Standby power <30mW (typical)
• Differential outputs support DC coupling to 1.2V, 2.5V
or 3.3V CML logic
• 0/6 dB gain boost selection pin
• Cable Length Indicator output; varies monotonically
with input cable length
• Selectable de-emphasis: 2dB, 4dB and 6dB
• Standard EIA/JEDEC logic control and status signal
levels
• Single 3.3V power supply operation
• 207mW power consumption (typical)
• Wide operating temperature range of -40ºC to +85ºC
• Small footprint QFN package (4mm x 4mm)
• Pb-free and RoHS compliant
Applications
• SMPTE 424M, SMPTE 292M and SMPTE 259M coaxial
cable serial digital interfaces
Description
The GS2993 is a high-speed BiCMOS integrated circuit
designed to equalize and restore signals received over 75Ω
coaxial cable.
The device is designed to support SMPTE 424M,
SMPTE292M and SMPTE 259M, and is optimized for
performance at 270Mb/s, 1.485Gb/s and 2.97Gb/s.
The GS2993 features DC restoration to compensate for the
DC content of SMPTE pathological test patterns.
The Carrier Detect output pin (CD) indicates whether a
valid input signal has been detected. It can be connected
directly to the SLEEP pin to enable automatic power-down
upon loss of carrier. A voltage programmable threshold,
which can be changed via the SQ_ADJ pin, forces CD high
when the input signal amplitude falls below the threshold.
This allows the GS2993 to distinguish between
low-amplitude SDI signals and noise at the input of the
device.
The equalizing and DC restore stages are disengaged when
the BYPASS pin is HIGH. No equalization occurs in Bypass
mode.
The GS2993 includes a gain selection pin (GAIN_SEL)
which, when tied HIGH, compensates for 6dB flat
attenuation.
The differential outputs can be DC-coupled to Gennum
3.3V cable drivers and reclockers, and to industry-standard
1.2V, 2.5V, and 3.3V CML logic by connecting the
respective VCCO to 1.2V, 2.5V or 3.3V.
The GS2993 also includes programmable de-emphasis with
three operating levels in order to support long PCB traces.
The device is available in a 24-pin, 4mm x 4mm QFN
package.
Power consumption of the GS2993 is typically 207mW.
The GS2993 is Pb-free, and the encapsulation compound
does not contain halogenated flame retardant.
This component and all homogeneous subcomponents are
RoHS compliant.
GS2993 Dual Output Adaptive Cable Equalizer
Data Sheet
53966 - 4
August 2012
www.semtech.com
1 of 23
Propietary & Confidential

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