GS2986 Datasheet PDF - Gennum

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GS2986
Gennum

Part Number GS2986
Description Multi-Rate SDI Reclocker
Page 30 Pages


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GS2986 Multi-Rate SDI Reclocker with Equalization & De-emphasis
Features
• SMPTE 424M, SMPTE 292M and SMPTE 259M-C compliant
• Supports DVB-ASI at 270Mb/s
• Single supply operation at 3.3V or 2.5V
• 180mW typical power consumption (213mW with RCO
enabled) at 2.5V
• Input signal equalization and output-signal de-emphasis
settings to compensate for board-trace dielectric losses
• 4:1 input multiplexer patented technology
• Choice of dual reclocked data outputs or one reclocked data
output and one clock output
• Uses standard 27MHz crystal
• Cascadable crystal buffer supports multiple reclockers using
a single crystal
• Differential inputs and outputs
Š support DC coupling to industry-standard differential
logic
Š on-chip 100Ω differential data input/output termination
Š selectable 400mVppd or 800mVppd output swing on
each output
Š seamless interface to other Gennum products
• 4 wire SPI host interface for device configuration and
monitoring
Standard logic control and status signal levels
• Auto and Manual modes for rate selection
• Standards indication in Auto mode
• Lock Detect Output
• Mute, Bypass and Autobypass functions
• SD/HD indication output to control GS2978 or GS2988 dual
slew-rate cable drivers
• Operating temperature range: -40°C to +85°C
• Small footprint QFN package (6mm x 6mm)
• Pb-free and RoHS compliant
Applications
• SMPTE 424M, SMPTE 292M and SMPTE 259M-C coaxial
cable serial digital interfaces
Description
The GS2986 is a multi-rate serial digital reclocker designed to
automatically recover the embedded clock from a digital video
signal and retime the incoming video data. It will recover the
embedded clock signal and retime the data from a SMPTE 424M,
SMPTE 292M, or SMPTE 259M-C compliant digital video signal.
A serial host interface provides the ability to configure and
monitor multiple GS2986 devices in a daisy-chain configuration.
Adjustable input trace equalization (EQ) for up to 40” of FR4 trace
losses, and adjustable output de-emphasis (DE) for up to 20” of
FR4 trace losses, can be configured via the host interface.
The GS2986 can operate in either auto or manual rate selection
mode. In Auto mode, the device will automatically detect and lock
onto incoming SMPTE SDI data signals at any supported rate. For
single rate data systems, the GS2986 can be configured to operate
in Manual mode. In both modes, the device requires only one
external crystal to set the VCO frequency when not locked and
provides adjustment free operation.
The GS2986 accepts industry-standard differential input levels
including LVPECL and CML. The differential data and clock
outputs feature selectable output swing via the host interface,
ensuring compatibility with most industry-standard, terminated
differential receivers.
The GS2986 features dual differential outputs. The second output
can be configured to emit either the recovered clock signal or the
re-timed video data. This output can also be disabled to save
power.
In systems which require passing of non-SMPTE data rates, the
GS2986 can be configured to either automatically or manually
enter a bypass mode in order to pass the signal without reclocking.
The GS2986 is Pb-free, and the encapsulation compound does not
contain halogenated flame retardant. This component and all
homogeneous sub-components are RoHS compliant.
GS2986 Multi-Rate SDI Reclocker with Equalization &
De-emphasis
Data Sheet
52134 - 1
March 2010
www.gennum.com
1 of 41
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