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Multiplexers offer cost savings

Posted: 25 Apr 2005 ?? ?Print Version ?Bookmark and Share

Keywords:intersil? el4342? multiplexer? mux? el4340?

Two highly integrated solutions for switching high-resolution RGB or HDTV signals was recently announced by Intersil Corp. The EL4342, a triple 4:1 multiplexer (mux), was designed primarily for RGB or YPbPr video switching. It can accept four sources of high quality video and switch loss-free between the multiple channels. Meanwhile, the EL4340, a triple 2:1 mux, can accept two sources and switch between them.

"The EL4342 represents a significant cost saving for our customers over alternate solutions by virtue of the high degree of integration," shared Patrick Long, marketing manager for Intersil's video products. "It is now feasible to use a single device across a manufacturer's entire product line because of the exceptional bandwidth, small footprint and competitive cost."

"This will save our customers significant rework of boards to expand or reduce the number of high definition inputs they are able to support," added Long.

Key performance parameters of the EL4342 include 500MHz -3dB bandwidth, 16mA per channel supply current, and a slew rate of 870V/?s. According to Intersil, these features make the EL4342 superior to any other mux on the market. In addition, a 0.1dB flat band of 60MHz ensures that HDTV quality video is not degraded.

Both the EL4340 and EL4342 are fixed unity gain mux amps featuring high slew rates and excellent bandwidth for video switching. These devices feature a high impedance output state (HIZ) that enable the outputs of multiple devices to be wired together. A power-down mode is included to turn off un-needed circuitry in power sensitive applications; when enabled, the EL4340 and EL4342 enter standby power mode where they consume 18mW of power. An added feature of the EL4340 is a latch enable function that allows independent logic control using a common logic bus.

With small footprints, these new products allow support for multiple video inputs on TVs, audio/video receivers, projectors and video switches with minimal space consumption. Prior to the release of these devices, system designers needed three discrete chips to accomplish the same functionality and performance, added Intersil.


The EL4340 and the EL4342 are available in standard lead and Pb-free finish. The EL4340 is packaged in a 24 pin QSOP and is priced at $1.99 each, while the EL4342 is housed in a 5-by-5mm 32-lead QFN package and is priced at $3.49 each. Both pricing are for 1,000-piece quantities.

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