Product category: Communications ICs (Wired)
News Release from: National Semiconductor | Subject: LMH0056
Edited by the Electronicstalk Editorial Team on 11 September 2006
SDI reclocker is the industry's smallest
Multirate video reclocker supports both standard-definition and high-definition (SD/HD) serial digital interface (SDI) data transmission.
National Semiconductor Corp has introduced a multirate video reclocker that supports both standard-definition and high-definition (SD/HD) serial digital interface (SDI) data transmission National's LMH0056 SDI reclocker is the industry's smallest and lowest power multirate reclocker with a 4:1 input multiplexer (mux)
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
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The LMH0056 complements National's previously released LMH0044, an adaptive cable equaliser, and LMH0002, a cable driver, to form a complete chipset for SMPTE-292M and SMPTE-259M serial routing and distribution applications such as video routers, switches, distribution amplifiers, processing, editing and conversion equipment.
It also fully supports the DVB-ASI digital television distribution standard at 270Mbit/s.
In a tiny 48-pin LLP package that is 40% smaller than competitors' solutions, National's LMH0056 automatically recovers the data and clock signals from incoming SDI streams.
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SDI reclockers typically receive the output from a digital crosspoint switch in video router and switcher applications.
The reclocker removes the jitter from the signal prior to processing or driving serially over coaxial cable.
The LMH0056 integrates a 4:1 input mux for dynamic selection of incoming signals.
For systems that require an independent, dedicated reclocker for each SDI channel, designers may use National's LMH0046 HD/SD reclocker with no input mux.
The LMH0056 supports the most critical datarates for standard-definition SDI and high-definition SDI serial routing and distribution, including 143Mbit/s, 270Mbit/s, 1.4835Gbit/s and 1.485Gbit/s.
By narrowing the range of supported datarates, the designers of the LMH0056 optimised the architecture of the internal VCO to maximise performance at selected datarates.
The result is superior jitter tolerance and lower output jitter, for a cleaner, lower noise signal on the output.
The two differential outputs of the LMH0056 easily interface with differential inputs on National's LMH0202 dual HD/SD cable driver for applications that require multiple SDI outputs with excellent return loss and limited board area.
A minimum of 0.6 unit intervals (UI) of jitter tolerance allows the LMH0056 to successfully recover signals with greater than 60% of the eye pattern closed, or collapsed due to accumulated jitter, and still produce ultra-clean, low-jitter data and clock outputs.
Output jitter of 0.02 UI at standard-definition rates of 270Mbit/s and 0.05 UI at high-definition rates of 1.485Gbit/s is the lowest in the industry.
Dual-differential reclocked outputs and an optional low-jitter data-rate clock maximise designer flexibility.
A single 27MHz reference frequency provides designers the choice of either a widely available 27MHz system clock or low-cost 27MHz external crystal.
Additional features include lock detect, manual rate select, LVPECL serial inputs and outputs, auto/manual bypass and an output mute function for data and clock.
The LMH0056 costs $33 each in quantities of 100, and samples will be available in Q4 2006.
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