GS3441 Datasheet, PDF (1/25 Pages) Semtech Corporation – Extended Reach 3G/HD/SD Adaptive Cable Equalizer with Dual Outputs

GS3441
Extended Reach 3G/HD/SD Adaptive Cable Equalizer with Dual Outputs
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
• Dual, independently-controlled outputs
• Manual bypass (useful for low data rates with slow
rise/fall times)
• Programmable carrier detect with squelch threshold
adjustment
• Cable Length Indicator (CLI) output; varies
monotonically with input cable length
• Automatic power-down on loss of signal
Š Standby power <35 mW (typical)
• Differential outputs support 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 (one output enabled), 212mW (both outputs
enabled) typical power consumption
• Wide operating temperature range of -40ºC to +85ºC
• Small footprint QFN package (4mm x 4mm)
• Pb-free and RoHS compliant
Applications
• SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259
coaxial cable serial digital interfaces
Description
The GS3441 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 GS3441 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 power-down upon
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 GS3441 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 GS3441 features a gain selection pin (GAIN_SEL) which
can be used to compensate for 6dB flat attenuation prior to
input of the device.
The differential outputs 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.
GS3441 Extended Reach 3G/HD/SD Adaptive Cable
Equalizer with Dual Outputs
Final Data Sheet Rev. 1
GENDOC-056647 May 2013
www.semtech.com
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