LMH0056 HD/SD SDI Reclocker with 4:1 Input Multiplexer
April 2007
LMH0056
HD/SD SDI Reclocker with 4:1 Input Multiplexer
General Description
The LMH0056 HD/SD SDI Reclocker with 4:1 Input Multi-
plexer retimes serial digital video data conforming to the
SMPTE 292M and SMPTE 259M (A & C) standards. The
LMH0056 operates at serial data rates of 143 Mbps, 270
Mbps, 1.483 Gbps and 1.485 Gbps. The LMH0056 supports
DVB-ASI operation at 270 Mbps. The LMH0056 includes an
integrated 4:1 input multiplexer for selecting one of four input
data streams for retiming.
The LMH0056 automatically detects the incoming data rate
and adjusts itself to retime the incoming data to suppress ac-
cumulated jitter. The LMH0056 recovers the serial data-rate
clock and optionally provides it as an output. The LMH0056
has two differential serial data outputs; the second output may
be selected as a low-jitter, data-rate clock output. Controls
and indicators are: serial clock or second serial data output
select, manual rate select input, SD/HD rate indicator output,
lock detect output, auto/manual data bypass and output mute.
The serial data inputs, outputs, and serial data-rate clock out-
puts are differential LVPECL compatible. The CML serial data
and serial data-rate clock outputs are suitable for driving
100鈩?differentially terminated networks. The control logic in-
puts and outputs are LVCMOS compatible.
The LMH0056 is powered from a single 3.3V supply. Power
dissipation is typically 360 mW. The device is housed in a 48-
pin LLP package.
Features
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Supports SMPTE 292M and SMPTE 259M (A & C) serial
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digital video standards
Supports 143 Mbps, 270 Mbps, 1.483 Gbps, and 1.485
Gbps serial data rate operation
Supports DVB-ASI at 270 Mbps
Single 3.3V supply operation
360 mW typical power consumption
Integrated 4:1 multiplexed input
Two differential, reclocked outputs
Choice of second reclocked output or low-jitter,
differential, data-rate clock output
Single 27 MHz external crystal or reference clock input
Manual rate select input
SD/HD operating rate indicator output
Lock Detect indicator output
Output mute function for data and clock
Auto/Manual reclocker bypass
Differential LVPECL compatible serial data inputs and
outputs
LVCMOS control inputs and indicator outputs
48-Pin LLP package
Industrial temperature range: -40掳C to +85掳C
Applications
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SDTV/HDTV serial digital video interfaces for:
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Digital video routers and switchers
Digital video processing and editing equipment
DVB-ASI equipment
Video standards and format converters
Typical Application
20201901
漏 2007 National Semiconductor Corporation
202019
www.national.com
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