Single-supply multiplexers deliver increased design flexibility for high-end video apps
( 01 Mar 2008 )
Intersil Corporation has developed two single-supply, triple 4:1 buffered multiplexers, designed for use in high-end consumer video products. The two new ICs are the ISL59451, which offers an integrated DC-restore feature and the ISL59452, which is designed for AC-coupled systems.
The ISL59451 and ISL59452 are said to be the first single-supply, buffered triple 4:1 multiplexers in the industry. This feature set is important for consumer customers designing systems where video input is the only feature requiring a negative rail. By eliminating the need for a negative rail, these ICs will help simplify the design of such products as projectors, high-definition TVs and broadcast equipment, and will save board space and cost for ODMs (Original Device Manufacturers).
The ISL59451’s integrated DC-restore feature lifts the video signal above ground and into the operating range of the multiplexer, ensuring the video is in the correct voltage range for processing and a high-quality video signal will result. For systems using an AC-coupled design, the ISL59452 is offered without the integrated DC-restore feature and at a slightly lower price. Using these parts, customers can choose between AC or DC coupling video into the 0V to 5V range, while maintaining the excellent video characteristics from the multiplexer that are usually associated with ±5V performance.
