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A/V clock generator delivers 40ps jitter

Posted: 20 Apr 2010 ?? ?Print Version ?Bookmark and Share

Keywords:A/V clock generator? FPGA? Serdes?

LMH1983 A/V clock generator

National Semiconductor Corp. has released a triple-rate (3G/HD/SD) audio/video clock generator that eliminates the need for external clock conditioning in professional and broadcast video equipment.

The LMH1983 produces all the major video and audio reference clocks required for a broad range of applications. The highly-integrated LMH1983 also provides low-output jitter (40ps peak-to-peak), enabling Society of Motion Picture and Television Engineers (SMPTE) compliance using FPGA Serdes transceivers.

The LMH1983 replaces three external PLLs, voltage-controlled crystal oscillators and loop filters to simplify design, reduce BOM cost and conserve board area. It generates four simultaneous LVDS clocks with dedicated top-of-frame timing pulses, providing a "plug-and-play" solution with minimal FPGA programming. The LMH1983 also eliminates the time-consuming PLL tweaking, required with discrete A/V clock generator implementations, accelerating time to market. The LMH1983 supports SMPTE serial digital interface video and digital audio AES3/EBU standards for 1080p high-definition video cameras and video capture, conversion, processing, editing and distribution equipment.

For video processing and format converter cards, the LMH1983 simultaneously provides the SMPTE 424M system clocks (148.5MHz and 148.5/1.001MHz) required by the latest generation of FPGAs. For broadcast studios that "gunlock" video equipment, the LMH1983 generates a synchronized high-frequency clock at the digital pixel rate phase-locked to the horizontal and vertical timing signals of the reference video signal. For applications that embed the audio signal or remove it from the video signal, the LMH1983 generates synchronous audio and video clocks locked to the video reference signal.

Pricing for the LMH1983 is $16 each in 1,000 units.

- Ismini Scouras

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