LMH0046 HD/SD SDI Reclocker with Dual Differential Outputs
PRELIMINARY
April 2007
LMH0046
HD/SD SDI Reclocker with Dual Differential Outputs
General Description
The LMH0046 HD/SD SDI Reclocker retimes serial digital
video data conforming to the SMPTE 292M and SMPTE
259M (A & C) standards. The LMH0046 operates at serial
data rates of 143 Mbps, 270 Mbps, 1.483 Gbps and 1.485
Gbps. The LMH0046 supports DVB-ASI operation at 270
Mbps.
The LMH0046 automatically detects the incoming data rate
and adjusts itself to retime the incoming data to suppress ac-
cumulated jitter. The LMH0046 recovers the serial data-rate
clock and optionally provides it as an output. The LMH0046
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 LMH0046 is powered from a single 3.3V supply. Power
dissipation is typically 330 mW. The device is housed in a 20-
pin e-TSSOP 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
330 mW typical power consumption
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
20-Pin e-TSSOP package
Industrial temperature range: -40擄C to +85擄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
20182601
漏 2007 National Semiconductor Corporation
201826
www.national.com
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