Video multiplexer replaces multiple devices

Edited by the Electronicstalk editorial team Nov 15, 2006

Triple-channel 4:1 multiplexer allows the user to switch between four different input signals such as RGB or YPbPr.

Intersil has introduced the ISL59446, a triple-channel 4:1 multiplexer that allows the user to switch between four different input signals such as RGB (red, green, blue) or YPbPr (the colour space used in video electronics).

The device allows customers to replace multiple muxes, simplifying design and saving board space.

The ISL59446 allows users who have several different video inputs on their system to switch between them without adding additional muxes to achieve the correct mux size for their applications.

The device supports four video input signals, each comprised of three channels, making it ideal for next-generation video electronics.

It provides 500MHz bandwidth to meet the high-resolution requirements of monitors and projectors as well as the KVM (keyboard, video and mouse) market.

The device provides 500MHz bandwidth into a 150ohm load to support high-resolution video while driving a typical video load.

A slew rate of 1600V/us enables good bandwidth even at the high signal levels associated with video signals.

The ISL59446 has integrated buffers with a fixed gain of 2 for driving double-terminated video loads.

Double termination reduces the output signal by a factor of two, so by first increasing the amplitude by a factor of two, video remains at the correct level without an additional amplification stage.

Each output of the ISL59446 can be put into a high impedance state so users can connect the outputs of multiple devices together to form large matrices.

Also, a power-down mode (enable) that reduces power to just 14mW is incorporated, so unneeded circuitry can be turned off in power-sensitive applications.

Additionally, a latch enable (LE) function allows independent logic control using a common logic bus.

Other key features of the device include high impedance outputs, +/-5V operation, a supply current requirement of 11mA/channel, and Pb-free plus anneal availability (RoHS compliant).

Target applications include HDTV/DTV analogue inputs, video projectors, computer monitors, set-top boxes, security video, and broadcast video equipment.

The ISL59446 is available now in a 24-lead QFN package.