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Video amps enhance images, capacity of HDTVs

Posted: 19 Sep 2008 ?? ?Print Version ?Bookmark and Share

Keywords:video amplifier? HDTV?

Analog Devices Inc. (ADI) has introduced three high-performance video amplifiers that bring higher levels of picture quality and power efficiency to HDTV and video equipment.

Improved features to ADI's Advantiv advanced TV solutions portfolio include the ADA4420-6 video filter and the compact ADA4855-3 and ADA4856-3 triple, rail-to-rail output video amplifiers. These innovations target consumer and industrial applications for HD content in multimedia products ranging from 1080p HDTVs and HD home theater systems to professional and industrial video applications.

The ADA4855-3 and ADA4856-3 triple, rail-to-rail output video amplifiers are believed to provide the best mixture of speed and performance in their class, making them well suited for consumer and professional video devices that need the highest bandwidth and the widest output voltage range for high-analog video performance. With unit costs that are comparable with more complex, lower bandwidth rail-to-rail output video amplifiers, these devices fit high-resolution video applications that require lossless 1080i, sharper 1080p analog output video and a wide output swing. The video amplifiers also can be used as analog video buffers in all video output devices such as PCs, monitors, projectors and DVD players, removing the need for discrete components.

Better capabilities
The ADA4855-3 and ADA4856-3 provide upgraded video performance, driving a 150 load with a 0.01 percent differential gain error, 0.01 differential phase error and 0.1dB flatness out to 63MHz and 85MHz, respectively. Using a single 5V power supply, these devices use only 7.7mA per amplifier, while rendering up to 40mA of load current, and on-chip power-down features reduce the supply current to 1mA. When combined with high dynamic range, the low supply current makes these products suitable for any application that needs a power efficient, high-performance rail-to-rail operational amplifier. These devices are designed to work over the extended temperature range from -40C to +105C.

Complex viability
By integrating a number of buffers, discrete components and six independent filter channels, three for SD (Y/C, CVBS) and three for HD component (YPbPr or RGB) signals, the ADA4420-6 offers HDTV and HD component video subsystem designers a single-chip solution that backs HD, standard definition (SD), S-video, and composite video signals. With resolution up to 1080i, the new video filter is well-suited for HD consumer applications and to be used as a reconstruction filter at the D/A outputs of video encoders.

The ADA4420-6 drives two parallel 75 loads while providing 1dB flatness out to 30MHz typical, and HD rejection of -35dB at 75MHz. At the same time, the video filter has only 10ns maximum group delay and offers 0.19 percent differential gain and 0.76 differential phase. It operates on a single 5V power supply and has a power-saving disable feature that lowers the supply current to less than 8?A when the device is not being used. The ADA4420-6 works well in the extended industrial temperature range from -40C to +85C.

-Gina Roos

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