LMH0346 3 Gbps HD/SD SDI Reclocker with Dual Differential Outputs
February 4, 2008
LMH0346
3 Gbps HD/SD SDI Reclocker with Dual Differential Outputs
General Description
The LMH0346 3 Gbps HD/SD SDI Reclocker retimes serial
digital video data conforming to the SMPTE 424M, SMPTE
292M, and SMPTE 259M (C) standards. The LMH0346 op-
erates at serial data rates of 270 Mbps, 1.483 Gbps, 1.485
Gbps, 2.967 Gbps, and 2.97 Gbps. The LMH0346 supports
DVB-ASI operation at 270 Mbps.
The LMH0346 automatically detects the incoming data rate
and adjusts itself to retime the incoming data to suppress ac-
cumulated jitter. The LMH0346 recovers the serial data-rate
clock and optionally provides it as an output. The LMH0346
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 clock outputs are
differential LVPECL compatible. The CML serial data and se-
rial clock outputs are suitable for driving 100鈩?differentially
terminated networks. The control logic inputs and outputs are
LVCMOS compatible.
The LMH0346 is powered from a single 3.3V supply. Power
dissipation is typically 370 mW. The device is housed in a 20-
pin e-TSSOP package.
Features
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Supports SMPTE 424M, SMPTE 292M, and SMPTE
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259M (C) serial digital video standards
Supports 270 Mbps, 1.483 Gbps, 1.485 Gbps, 2.967
Gbps, and 2.97 Gbps serial data rate operation
Supports DVB-ASI at 270 Mbps
Single 3.3V supply operation
370 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
Footprint compatible with the LMH0046
Applications
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SDTV/HDTV and 3 Gbps 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
20215001
漏 2008 National Semiconductor Corporation
202150
www.national.com
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