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Semtech - Extended Reach 3G/HD/SD Adaptive Cable Equalizer

Numéro de référence GS3440
Description Extended Reach 3G/HD/SD Adaptive Cable Equalizer
Fabricant Semtech 
Logo Semtech 





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GS3440 fiche technique
GS3440
Extended Reach 3G/HD/SD Adaptive Cable Equalizer
Key Features
• SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259
compliant
• Automatic cable equalization
• Multi-standard operation from 125Mb/s to 2.97Gb/s
• Performance optimized for 270Mb/s, 1.485Gb/s and
2.97Gb/s. Typical equalized length of Belden 1694A
cable up to:
Š 210m at 2.97Gb/s
Š 300m at 1.485Gb/s
Š 550m at 270Mb/s
• Supports DVB-ASI at 270Mb/s
• Supports MADI at 125Mb/s
• 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 <35mW (typical)
• Differential output supports DC-coupling from 1.2V to
3.3V CML logic
• Option to compensate for 6dB flat attenuation prior to
input of device
• Selectable output de-emphasis: 2dB, 4dB and 6dB
• Standard EIA/JEDEC logic control and status signal
levels
• Single 3.3V power supply operation
• 180mW power consumption (typical)
• Wide operating temperature range of -40ºC to +85ºC
• Small footprint QFN package (4mm x 4mm)
Š Footprint compatible with the GS2974A, GS2974B,
GS2984 and GS2994
• Pb-free and RoHS compliant
Applications
• SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259
coaxial cable serial digital interfaces
Description
The GS3440 is a high-speed BiCMOS device designed to
equalize and restore signals received over 75Ω coaxial
cable.
The device is designed to support SMPTE ST 424,
SMPTE ST 292 and SMPTE ST 259, and is optimized for
performance at 270Mb/s, 1.485Gb/s and 2.97Gb/s.
The GS3440 features DC restoration to compensate for the
DC content of SMPTE pathological signals.
The Carrier Detect output pin (CD) indicates whether an
input signal has been detected. It can be connected directly
to the SLEEP pin to enable automatic sleep on loss of carrier.
A voltage programmable threshold, set via the SQ_ADJ pin,
forces CD high when the input signal amplitude falls below
the threshold. This allows the GS3440 to distinguish
between low-amplitude SDI signals and noise at the input
of the device.
The equalizing and DC restore stages are disengaged and
no equalization occurs when the BYPASS pin is HIGH.
Setting the BYPASS pin HIGH is useful for signals launched
at the signal source with low data rates and/or slow rise/fall
times.
The GS3440 features a gain selection pin (GAIN_SEL) which
can be used to compensate for 6dB flat attenuation prior to
the input of the device.
The differential output can be DC-coupled to Semtech’s
reclockers and cable drivers, as well as industry-standard
1.2V, 1.8V, 2.5V and 3.3V CML logic by changing the voltage
applied to the VCC_O pin. In general, DC-coupling to any
termination voltage between 1.2V and 3.3V is supported.
The GS3440 also features programmable output
de-emphasis with three, user-selectable operating levels to
support long PCB traces at the output of the device.
GS3440 Adaptive Cable Equalizer
Final Data Sheet
Rev. 2
December 2012
www.semtech.com
1 of 23
Proprietary and Confidential

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