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SD video filters require 3.3V single supply

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

Keywords:SD video filters? portable consumer applications? 3V power supply?

Maxim Integrated Products has introduced the MAX9583-MAX9589, MAX9517 and MAX9524 family of standard-definition (SD) video filters for STBs and portable consumer applications.

Unlike traditional video filters which operate from 5V supplies and in some cases, 5V, the new chips operate from a single 3.3V supply. The devices are available in single-, dual-, triple- and quad-channel configurations. They filter CVBS, Y/C, RGB and Y-Pb-Pr video signals.

When used in STBs, the inputs on the MAX9583/MAX9584/MAX9585 and MAX9517 can be directly connected to the outputs of a video DAC, if the video signal is between ground and approximately 1V. The MAX9587/MAX9588/MAX9589 and the MAX9524, however, have AC-coupled inputs which eliminate the need for external clamping circuits in applications where the input signal is not between ground and approximately 1V.

To minimize power consumption in portable devices, the MAX9586 (single-channel) and MAX9517/MAX9524 (dual analog-switch extensions of the MAX9586) also feature a shutdown mode. The two SPST analog switches on the MAX9517/MAX9524 provide integration and flexibility in circuit design and allow routing of stereo audio, video or digital signals. The MAX9517/MAX9524, for example, can be configured as a 2:1 video mux. The MAX9524 can be used in security/CCTV cameras to drive S-video signals with night-vision support (C-mute).

The video output amplifiers of the MAX9583-MAX9589, MAX9517 and MAX9524 source and sink load current, allowing output loads to be DC- or AC-coupled. Each amplifier provides a fixed gain of 6dB. Also, if the supply voltage exceeds 3.135V (5 percent below a 3.3V supply), each amplifier can drive two DC-coupled video loads to ground.

The small size and low-power consumption of these devices also make them suitable for use in end products such as notebook PCs, TVs, DVD players, GPS and car navigation systems.

The MAX9583-MAX9589, MAX9517 and MAX9524 operate from a 2.7-3.6V single supply and are specified over the -40C to 125C automotive temperature range. The devices are offered in space-saving SOT23, microMAX, and TQFN packages. The 9mm? microMAX package is more than 50 percent smaller than the competitive 20mm? package.

Samples and evaluation kits are available now. Prices start at 49 cents for the MAX9583/MAX9587, 59 cents for the MAX9584/MAX9588, 69 cents for the MAX9585/MAX9589 and 55 cents for the MAX9517/MAX9524, all in 1,000-unit pieces.

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