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Proprietary & Confidential
GS3140
Product Brief Rev.0
PDS-060941 January 2015
Gennum Products
GS3140
Multi-Rate Adaptive 3G
SDI Equalizer
www.semtech.com
Key Features
• Multi-standard operation at rates between 1Mb/s and
2.97Gb/s
• SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259
compliant
• AES10 (MADI) compatible
• Industry leading cable reach, with automatic cable
equalization for different lengths of cable
• Performance optimized for 125Mb/s, 270Mb/s,
1.485Gb/s, and 2.97Gb/s. Typical equalized length of
Belden 1694A cable up to:
200m at 2.97Gb/s
280m at 1.485Gb/s
500m at 270Mb/s
• 1.8V core power supply
• Typical power consumption of 84mW when
DC-coupled at 1.2V with OUTPUT_SWING = 0011
b
• Ultra-low power mode for shorter cable reach
applications
• Upstream launch swing compensation from 250mV
ppd
to 1V
ppd
in approximately 50mV
ppd
steps (Default
750mV
ppd
)
• Auto/Manual bypass (useful for low data rates with
slow rise/fall times)
• Robust, noise-immune signal detection with squelch
threshold adjustment
• Auto/Manual control of SLEEP/MUTE/DISABLE OUTPUT
modes
• Data Rate detection and indication
<MADI, MADI, SD, HD, 3G differentiation
• Digital cable length indication (CLI)
• Differential output supports DC-coupling from
1.2V to 2.5V CML logic and AC-coupling for other logic
families
• Programmable/Rate-dependent output de-emphasis
level and delay
• Host interface for status and control
• 3kV HBM ESD protection on all pins
• Wide operating temperature range of -40ºC to +85ºC
• Small footprint QFN–COL package
(16-pin, 4mm x 4mm)
• Pb-free and RoHS compliant
• Pin-compatible with the GS6140
Applications
• SMPTE ST 424, SMPTE ST 292, SMPTE ST 259 and AES10
coaxial cable serial digital interfaces
Description
The GS3140 is a high-speed BiCMOS device designed to
equalize and restore signals received over cable.
The device is designed to support SMPTE ST 424, SMPTE ST
292, SMPTE ST 259 and AES10 (MADI), and it is optimized
for performance at 125Mb/s, 270Mb/s, 1.485Gb/s, and
2.97Gb/s.
The device supports MADI serial signals at 125Mb/s with
peak-to-peak launch amplitude between 300mV
ppd
and
600mV
ppd
(with AES10 spec rise and fall times) and
800mV
ppd
±10% (with SD-SDI rise and fall times).
The GS3140 features DC restoration to compensate for the
DC content of SMPTE pathological signals.
Loss of Signal (LOS) is detected when the input carrier is lost
or signal amplitude falls below a programmable threshold.
This is further processed by a filter programmable up to
1.6s before LOS status is asserted. The device can be
programmed to automatically sleep/mute/disable the
output on loss of signal.
An interrupt pin (INT) indicates LOS by default, and can be
programmed to signal various other statuses.
When the BYPASS control bit is set, the equalizing and DC
restore stages are disengaged. This is useful for signals
launched at the source with low data rates and/or slow rise
and fall times.
