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Maxim filters save space in portable video apps

Posted: 21 Dec 2006 ?? ?Print Version ?Bookmark and Share

Keywords:filters? video filter? buffers? Maxim? video?

Video filter from Maxim

Solving the problem of limited board space for separate input and output connectors on portable consumer video devices, Maxim Integrated Products has introduced the MAX7481/MAX7482 bidirectional video filters/buffers. These devices provide reconstruction filters and line drive buffers for both composite video (CVBS) and S-video (Y/C) signals in playback mode and anti-aliasing filters in record mode for consumer devices, such as portable media players, digital camcorders and digital still cameras.

These bidirectional video filters/buffers are suitable for portable video applications that require low-voltage, low-power operation and analog video inputs and outputs.

Saves space, cost
"Many applications in the portable consumer market have unique requirements that call for connector sharing for video recording and playback," said Jeremy Tole, Maxim's director of business management for advanced video products. "The MAX7481/MAX7482 use the same set of filters in both playback and record modes by using switches that route the signals through a different path for each mode. Implementing these internal switches with minimal on-resistance allows designers to use a single filter set for both modes. This unique functionality makes these devices efficient, compact solutions that save both space and cost."

Moreover, the new video buffers/filters feature the company's patented DirectDrive technology, which ensures low-power operation in a single-supply system. DirectDrive uses an internal negative charge pump and a regulator to maintain the output-blanking level at ground so that the output to the display can be DC-coupled. This topology eliminates the need for large output-coupling capacitors or a sag-correction configuration.

Shared connectors
MAX7481/MAX7482 offer features that enable portable consumer applications to share connectors in record and playback modes. It offers a composite and S-video record and video-playback interface for portable devices, inputs and outputs that share one connection to external video devices to save space in portable media applications, advanced power-down modes for extended battery life and 6dB (MAX7481) or 7dB (MAX7482) gain.

This combination of performance and integration enables both devices to save significant board space and design time, while improving performance at a cost comparable to the discrete fixed-frequency, high-definition, L-R-C filter, buffer and switch solutions available today.

Both the MAX7481 and MAX7482 operate from a single 2.7-3.6V power supply over the extended commercial-temperature range (-40C to 85C). These devices are offered in a 5-by-5mm, 28-pin TQFN package. Prices start at $1.35 (1,000-up, FOB USA).




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