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TI switches suit DVI, HDMI applications

Posted: 27 Aug 2007 ?? ?Print Version ?Bookmark and Share

Keywords:TI video switches? DVI applications? HDMI?

Texas Instruments Inc. has introduced two new video switches for digital video interface (DVI) or HDMI. The new devices connect either two or three digital video signals coming from devices such as game consoles, digital video switch boxes, STBs or DVD players to a single HDTV display.

Both the TMDS351 three-port switch and the TMDS251, two-port switch integrate four transition minimized differential signaling (TMDS) channels, one hot plug detector and a digital display control interface on each port. Each TMDS channel supports signaling rates up to 2.5Gbps to allow 1,080p resolution in 12bit color depth, making it compatible with the HDMI 1.3a standard. Switchable termination resistors (50) are integrated at each TMDS receiver input, eliminating the need for external terminations. Both devices share the same package and pinout allowing customers to easily and quickly develop common platforms for 3 and 2 HDMI inputs.

The HDMI/DVI switches provide selectable receiver equalization to accommodate different input cable lengths, allowing longer cable reaches and improved opening of the data eye for better noise budgeting. Each device provides strong ESD protection at the connector by featuring 8kV human body model (HBM) circuitry on the TMDS inputs.

These switches support power saving operation. When a system is in standby mode and there is no transmission of digital A/V content from a connected source, the 3.3V supply voltage can be powered off to minimize power consumption from the TMDS inputs, outputs and internal switching circuits.

The TMDS351 and TMDS251 devices join TI's extensive offering of high-performance analog and DSP products for video applications, including DaVinci processors optimized for digital video systems, the TVP7000/1 triple 8/10bit video ADCs and DLP technology. TI provides the silicon, software, systems expertise and support for customers' video designs, enabling them to accelerate market entry.

The TMDS351 and TMDS251 switches are available now in 64-pin TQFP packages priced at $2.50 and $1.60 respectively, each in 1,000-piece quantities.

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