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High-Peformance Amplifiers from Analog Devices

15th September 2008
ES Admin
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Analog Devices has introduced three high-performance video amplifiers that enable high-definition (HD) television and video equipment designers to bring professional and consumer products to market with new levels of picture quality and power efficiency. Additions to ADI’s Advantiv advanced television solutions portfolio, the ADA4420-6 video filter and the compact ADA4855-3 and ADA4856-3 triple, rail-to-rail output video amplifiers cost-effectively address consumer and industrial demand for HD content in multimedia products ranging from 1080p HDTVs and HD home theater systems to professional and industrial video applications.
“Analog Devices’ newly enhanced video filter and amplifiers enable engineers to deliver sharper, more lifelike images in high-resolution analogue video formats,” said Bill Bucklen, director, Advanced Television Segment, Analog Devices. “These compact, single-chip solutions reduce design complexity while eliminating costly system redesign in HD video applications – especially where a video filter is required to decode standard-definition content or a high-speed amplifier is needed to optimize screen images for 1080i or 1080p.”

The ADA4855-3 and ADA4856-3 triple, rail-to-rail output video amplifiers deliver the best combination of speed and performance in their class, making them ideal for consumer and professional video devices that require the highest bandwidth and the widest output voltage range in order to deliver superior analogue video performance. Offering unit costs that are comparable with more complex, lower bandwidth rail-to-rail output video amplifiers, the ADA4855-3 and ADA4856-3 are ideal for 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 analogue video buffers in all video output devices, such as PCs, monitors, projectors and DVD players, eliminating the need for discrete components.

The ADA4855-3 and ADA4856-3 provide single-supply, rail-to-rail operation with greater flexibility for passing a wide range of signals, while reducing system cost and complexity. The devices deliver advanced video performance, driving a 150-ohm load with 0.01 percent differential gain error, 0.01 degrees differential phase error and 0.1-dB flatness out to 63 MHz and 85 MHz, respectively. In addition, the ADA4855-3 offers a wide 400-MHz –3-dB bandwidth at gain of 1, while the ADA4856-3 delivers 220 MHz at a fixed gain of 2.

Using a single 5-V power supply, the ADA4855-3 and ADA4856-3 consume only 7.7 mA per amplifier, while delivering up to 40 mA of load current, and on-chip power-down features reduce the supply current to 1 mA. When combined with high dynamic range, the low supply current makes these products ideal for any application that needs a power efficient, high-performance rail-to-rail operational amplifier.

The ADA4420-6 video filter offers HDTV and HD component video subsystem engineers advanced performance, flexibility and power efficiency. 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 designers a single-chip solution that supports HD, SD (standard definition), S-Video, and composite video signals. With resolution up to 1080i, the new video filter is well-suited for HD consumer applications or for use as a reconstruction filter at the digital-to-analogue outputs of video encoders. The ADA4420-6’s compact (0.197 inches × 0.158 inches) 16-pin QSOP (Quarter Size Outline Package) size reduces board space requirements by 85 percent over traditional video amplifiers configured as filters, reduces the bill of materials by 50 percent and eliminates several days of design time for products including set-top boxes, DVD players and recorders.

Unlike larger packaged, less integrated devices with lower levels of HD flatness, reduced rejection and support for only one video load, the ADA4420-6 drives two parallel 75 ohm loads while providing 1-dB flatness out to 30 MHz typical, and HD rejection of –35 dB at 75 MHz. In addition, the new video filter has only 10 nanoseconds maximum group delay and provides 0.19 percent differential gain and 0.76 degrees differential phase. The ADA4420-6 operates on a single 5-V power supply and offers a power-saving disable feature that reduces the supply current to less than 8 μA when the device is not in use.

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