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issue: July 2003 APPLIANCE Magazine

Electronics Report
Sync Separator for HDTV

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The new ElantecĀ® EL4511 from Intersil Corporation (Palm Bay, FL, U.S.) provides sync separation in current and next-generation high-definition television (HDTV), digital television (DTV), PC, and data projection systems.

According to the company, the Elantec EL4511 is the world's first integrated circuit capable of separating synchronization signals in high-definition television (HDTV) systems. "This device allows the appliance designer to handle HDTV as well as traditional signals seamlessly," explains Sameer Vuyyuru, director of Marketing for Video and Op Amps for Intersil's Elantec Product Group. "It provides flexibility of image compression/expansion, value-added features such as PiP, and allows designers to manipulate the quality, source, and destination of the image."

The component is said to automatically detect and lock onto incoming video and data sources with line rates up to 200 kilohertz (kHz), supporting not only HDTV, but DTV, component video, NTSC and PAL composite video, and PC display. "A display appliance maker may not be aware of what kind of signal an appliance would be expected to interface to," Mr. Vuyyuru explains. "It may be an older standard such as NTSC or PAL, or it could be one of the new digital TV standards. The EL4511 device works with either, and no external intervention is required. Thus, you can design one interface or video processing board, and software-enable different value-added versions. This is in contrast to having a separate design for different video standards."

The result, he adds, is a reduction in the amount of components necessary, saving designers both time and money.

According to Mr. Vuyyuru, the new integrated circuit is the first of its kind for high-definition television. The design challenge for companies, he says, has been lack of knowledge of HDTV standards. "The standards have been in flux and are very fragmented for HDTV," Mr. Vuyyuru tells APPLIANCE. "Designing a universal sync separator requires detailed knowledge of more than 40 different standards. It also requires high-speed amplifier design capability. Intersil is one of only a handful of companies that has both competencies."

The EL4511 accepts sync on green, separate sync, and H/V sync inputs, automatically selecting the relevant format. According to Intersil, the EL4511 has been designed for compatibility with a wide range of video standards, operating with horizontal line rates from PAL/NTSC/SECAM rates up to 200 kHz and including bi-level and tri-level sync standards. It includes a qualification scheme that reportedly rejects high-frequency noise and other video artifacts such as color burst.

In addition, the sync separator offers an optional serial interface for selecting auto-standard detect or forcing standards and enables read-back of line rate, line-per-field, and field rate information. It is also available in small package options and operates on 1-mA typical supply current over the full -40 degrees C to +85 degrees C temperature range.


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