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Fanout switch chipset targets HDMI, DVI apps

Posted: 17 Mar 2008 ?? ?Print Version ?Bookmark and Share

Keywords:switch chipset fanout? HDMI? DVI?

Maxim Integrated Products has introduced the MAX3845/MAX4814E 2:4 fanout switch chipset for HDMI and DVI applications. In this two-chip solution, the MAX3845 provides switching, fanout and cable driving for TMDS signals, while the MAX4814E provides I?C control of the MAX3845 and handles all switching of the DDC, 5V, and HPD signals. These devices can be combined to create complete 2:4, 4:4, and 2:8 DVI switches with full I?C control. According to Maxim, the MAX3845/MAX4814E is the first digital video fanout switch solution of its kind, making it suitable for flexible, multidisplay digital signage and PC monitor applications.

In addition to performing all TMDS switching, the MAX3845, says Maxim, is the only digital video fanout switch to provide input equalization and output pre-emphasis. In contrast to typical HDMI/DVI systems that experience signal-reflection problems between interface ICs and connectors, the MAX3845 offers a selectable, higher-output current that enables the use of 200 ? back-termination resistors to absorb output reflections. Each output also includes selectable pre-emphasis to increase the usable reach of the output cable up to an additional 7m. To complete this two-chip solution, the MAX4814E provides 15kV of ESD protection on all of its I/O ports, and offers either I?C or parallel programming of the MAX3845. The unique pinouts of these devices allow 4:4 and 2:8 switch configurations to be implemented with just two chipsets.

The MAX3845 is packaged in a 100-pin TQFP, and the MAX4814E is packaged in a 64-pin TQFP. Both devices are fully specified over the -40C to +85C extended temperature range. Prices start at $9.90 for the MAX3845, and $4.40 for the MAX4814E (1,000 units and up). An evaluation board with DVI connectors for complete exercise of the MAX3845/MAX4814E chipset will be available-contact the factory for availability.

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