Dual-mode GPU transmits DisplayPort, HDMI

Texas Instruments has introduced three compact DisplayPort devices that provide connectivity between PCs and video displays. The low-power devices support data signaling rates up to 2.7Gbit/s to accommodate DisplayPort and HDMI speeds, commonly used to link desktop and notebook PCs and docking stations to DLP projectors, computer monitors and DTVs.

The SN75DP122, SN75DP128 and SN75DP129 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 GPU to transmit either DisplayPort or HDMI/DVI data over the DisplayPort signal lines while supporting the required control signals.

Flexible outputs
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. This will enable end users to connect laptops with DisplayPort outputs to monitors with DVI inputs. The translator can also be used in applications that display PC video data on digital TVs.

The SN75DP128 is a high-performance 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 flexible connection to either a monitor or a TV. On this device, the auxiliary port can be configured as an I?C port with an integrated I?C 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 PCB layout.

In addition to these DisplayPort devices, TI offers a broad array of electrostatic discharge protection solutions and low-power video switches suc