Dual-Link DVI Connector Ground Pins Explained

A dual-link DVI connector incorporates either five or six designated ground pins depending on whether the interface is digital-only (DVI-D) or integrated with analog signals (DVI-I). These pins serve critical roles in shielding high-speed data pairs against electromagnetic interference and providing return paths for low-voltage power and display data communication.

A standard DVI-D dual-link connector consists of a 24-pin digital grid. Within this pinout, there are five dedicated ground and shield connections:

  • Pin 3 (TMDS Data 2/4 Shield): Provides ground shielding for digital data channels 2 and 4.
  • Pin 11 (TMDS Data 1/3 Shield): Provides ground shielding for digital data channels 1 and 3.
  • Pin 15 (GND): Serves as the ground return line for the +5V power rail, Hot Plug Detect (HPD), and the Display Data Channel (DDC).
  • Pin 19 (TMDS Data 0/5 Shield): Provides ground shielding for digital data channels 0 and 5.
  • Pin 22 (TMDS Clock Shield): Isolates and shields the TMDS clock differential pair.

In a purely digital DVI-D dual-link setup, the total number of specified ground pins is 5.

A DVI-I dual-link connector adds five analog pins located adjacent to the 24-pin digital grid: four pins surrounding a flat ground blade.

  • Pin C5 (Analog Ground): The flat blade acts as the shared analog ground return path for the red, green, blue, and horizontal sync signals.

When counting the total ground connections on a fully populated DVI-I dual-link connector, the addition of Pin C5 brings the count to 6 ground pins.

Summary of Total Ground Pins

  • DVI-D Dual-Link (Digital Only): 5 ground pins (Pins 3, 11, 15, 19, and 22).
  • DVI-I Dual-Link (Digital + Analog): 6 ground pins (Pins 3, 11, 15, 19, 22, and C5).