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Texas Instruments Inc. (TI) has launched three compact DisplayPort devices that provide connectivity between personal computers and video displays. The low-power SN75DP122, SN75DP128 and SN75DP129 support data signaling rates up to 2.7Gbps to accommodate DisplayPort and high-definition multimedia interface (HDMI) speeds, commonly used to link desktop and notebook PCs and docking stations to DLP projectors, computer monitors and digital TVs.



The devices all provide one dual-mode DisplayPort input and flexible outputs to enable connectivity between a range of devices. Dual-mode is the ability of the graphics processor unit (GPU) to transmit either DisplayPort or HDMI/DVI data over the DisplayPort signal lines while supporting the required control signals.



The SN75DP129 translator has one dual-mode DisplayPort input and one transition-minimized differential signaling (TMDS) output. This device can function as a DisplayPort to HDMI/DVI dongle converter for external attachment to Notebook PCs. The translator can also be used in applications that display PC video data on Digital TVs.



The SN75DP128, with one DisplayPort input to one of two DisplayPort outputs, can be used in conjunction with laptop docking stations. It allows the GPU to direct video data either through the docking station connector or to a DisplayPort edge connector.



The SN75DP122 features one DisplayPort input to either a DisplayPort or a level translated TMDS output, allowing flexible connection to either a monitor or a TV. On this device, the auxiliary port can be configured as an I2C port with an integrated I2C repeater, which is required for HDMI operation.



Both the SN75DP128 and SN75DP122 support switching of the bi-directional auxiliary, hot plug detect (HPD) and cable adapter detect channels. An integrated level-shifter for the HPD line is provided, which avoids the need to use additional components. The pinouts of all three devices are optimized for easy flow-through printed circuit board layout.



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