Texas Instruments introduced three DisplayPort devices that provide connectivity between personal computers and video displays. The low-power devices support data signaling rates up to 2.7 Gbps to accommodate DisplayPort and high-definition multimedia interface (HDMI) speeds, commonly used to link desktop and notebook PCs and docking stations to computer monitors and digital TVs.
The SN75DP122, SN75DP128 and SN75DP129 all provide one dual-mode DisplayPort input and 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 is a switch with one DisplayPort input to one of two DisplayPort outputs. This device 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 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.
DisplayPort is a royalty-free digital video interface standard from the Video Electronics Standards Association (VESA). It is intended for internal and external display connections. Compared to existing standards, it offers audio and video performance over one cable and more compact sockets and connectors for notebook PCs and LCD displays.
The SN75DP122 and SN75DP128 are available now from TI and its authorized distributors in a 56-pin QFN package. Suggested resale pricing is $1.90 and $1.65, respectively. The SN75DP129 is available now in a 36-pin QFN package with suggested resale pricing at $1.30. All pricing is in 1,000-piece quantities.
