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HDMI switches connect multiple devices to digital TV

Posted: 27 Aug 2007     Print Version  Bookmark and Share

Keywords:DVI  TDMA channel  digital video interface  high definition multimedia interface 

Texas Instruments has introduced two new video switches for digital video interface or high definition multimedia interface. The new devices connect either two or three digital video signals coming from devices such as game consoles, digital video switch boxes, set-top boxes or DVD players to a single HDTV display.

Both the TMDS351 three-port switch, and the TMDS251, two-port switch integrate four transition minimised differential signaling channels, one hot plug detector and a digital display control interface on each port. Each TMDS channel supports signaling rates up to 2.5 Gbps to allow 1080p resolution in 12-bit colour depth, making it compatible with the HDMI 1.3a standard. Switchable termination resistors (50 ohm) 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 new 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 electrostatic discharge (ESD) protection at the connector by featuring 8 kV human body model (HBM) circuitry on the TMDS inputs.

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

The TMDS351 and TMDS251 switches are available now in 64-pin TQFP packages, from TI and its authorized distributors priced at Rs.101.12 ($2.50) and Rs.64.71 ($1.60) respectively, each in 1,000-piece quantities.

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