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OSD generator meets needs of CCTV security industry

Posted: 07 Nov 2007 ?? ?Print Version ?Bookmark and Share

Keywords:CCTV? security industry? OSD generator?

Fulfilling the CCTV security industry's requirement to generate and overlay user-defined text and graphics onto a video image, Maxim Integrated Products has introduced the MAX7456, a single-channel, monochrome on-screen-display (OSD) generator with integrated non-volatile memory (EEPROM). The device integrates all the functions needed to generate and insert user-defined OSD onto a video signal, and is compatible with composite NTSC and PAL video standards.

CCTV security applications typically consist of many cameras, routed through a video switch matrix, viewed and then recorded on a small number of monitors and recorders. Each of the various pieces of equipment in the application can contain an OSD function to display information such as date, time, camera ID, system setup, and control.

Traditionally, designers had to choose between inflexible fixed-character OSDs or expensive graphic controllers to generate and insert the OSD. Fixed-character OSDs offer only a limited selection of characters that can be displayed. Graphic controllers, moreover, are very expensive and involve complex system implementation.

"With the MAX7456 single-channel OSD generator, designers can now display information like company logo, custom graphics, time and date with increased flexibility and simpler implementation," said Jeremy Tole, Maxim's director of business management for advanced video products. Using the device's EEPROM, designers can insert 256 user-defined characters and graphics-a customer request that was not possible with fixed-character OSDs. "This implementation is quite simple, and costs significantly less than a full-featured graphic controller," added Tole.

The MAX7456 accepts standard NTSC or PAL CVBS signals, which are the most commonly used video standards in the security industry. The device thus serves all U.S. and international markets.

The MAX7456 saves significant board space and design time, while providing increased performance at lower cost. It operates over the -40C to 85C industrial temperature range, and is offered in a 28-pin TSSOP package. Prices start at $9 (1,000-up, FOB USA). Samples and evaluation kits are available.




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