1 PRECAUTIONS for HDMI cabling

  • 1. The differential pair spacing is preferentially set to 9mil or 11mil, and the line width is recommended to use 5-8mil, which can be adjusted according to the actual product; If the wiring is wide enough, the impedance is better controlled.
  • 2. It is recommended that there should be less holes. If holes need to be drilled, they can be made in accordance with the normal process size, with the recommended inner diameter of 20mil and outer diameter of 40mil.
  • 3. It is recommended that the distance between the holes should be about 35mil if differential matching holes are used;
  • 4, ESD, resistance and capacitance devices, through the hole nearby, remove GND copper around; Remove the bottom difference to GND plane;
  • 5, difference on the same layer around, prohibit laying copper;
  • 6, characteristic impedance to maintain 100 ω differential impedance, according to the actual situation; A single 50 ω characteristic impedance can also be used instead;
  • 7. HDMI error is 5mil within groups and 10mil between groups (this requirement is optional).

2 Differential cabling

  • Differential on the same layer around, do not lay copper, circle the area

  • Dig copper

2 Impedance analysis level HDMI differential cabling

3 Equal length between HDMI groups