Specifications

Signal namePinSignal namePin

TMDS Data5–20Analog vertical sync8

TMDS Data5+21TMDS Data1–9

TMDS Clock Shield22TMDS Data1+10

TMDS Clock+23TMDS Data1/3 Shield11

TMDS Clock–24TMDS Data3–12

Analog horizontal syncC4Analog redC1

Analog ground (analog R, G, B return)C5Analog greenC2

Analog blueC3

The graphics data sent to the digital monitor use transition minimized differential signaling (TMDS). TMDS

uses an encoding algorithm to convert bytes of graphics data into characters that are transition-minimized to

reduce EMI with copper cables and DC balanced for transmission over fiber optic cables. The TMDS algorithm

also provides robust clock recovery for greater skew tolerance with longer cables or low-cost short cables.

For information about TMDS, see the reference listed in Digital Visual Interface (page 68).

Note: The Power Mac G5 computer includes a DVI to VGA adapter.

Apple Display Connector

The ADC connector on the adapter carries both digital and analog video signals as well as USB and control

signals and power for an external monitor. Figure 3-8 (page 53) shows the contact configuration; Table

3-10 (page 54) and Table 3-11 (page 54) list the signals and pin assignments.

The maximum current available from the 25 V supply for the external monitor is 3.6 A.

Figure 3-8 Apple display connector

1 2 3 4 5 6 7 8

11 12 13 14 15 16 17 18

21 22 23 24 25 26 27 28

9 10

19 20

29 30

C3 C4

C1 C2

Input and Output Devices

Video Monitor Ports