Apple Display Connector
From Wikipedia, the free encyclopedia
| Apple Display Connector | ||
|---|---|---|
|
|
||
| Type | analog/digital video connector + USB | |
| Production history | ||
| Designer | Apple Computer | |
| Manufacturer | Apple Computer | |
| Superseded by | DVI (June 2004) | |
| Specifications | ||
| Hot pluggable | Yes | |
| External | Yes | |
| Max. voltage | 25 V | |
| Max. current | 4.0 A | |
| Pins | 35 | |
| Pin out | ||
| Pin 1 | 25 V Supply | |
| Pin 2 | 25 V Supply | |
| Pin 3 | LED | |
| Pin 4 | TMDS Data0– | |
| Pin 5 | TMDS Data0+ | |
| Pin 6 | TMDS Data0/5 Shield | |
| Pin 7 | TMDS Data5– | |
| Pin 8 | TMDS Data5+ | |
| Pin 9 | DDC Data | |
| Pin 10 | Vsync | |
| Pin 11 | 25 V Return | |
| Pin 12 | 25 V Return | |
| Pin 13 | Soft Power | |
| Pin 14 | TMDS Data1– | |
| Pin 15 | TMDS Data1+ | |
| Pin 16 | TMDS Data1/3 Shield | |
| Pin 17 | TMDS Data3– | |
| Pin 18 | TMDS Data3+ | |
| Pin 19 | DDC CLock | |
| Pin 20 | Clock Return | |
| Pin 21 | USB Data+ | |
| Pin 22 | USB Data– | |
| Pin 23 | USB Return | |
| Pin 24 | TMDS Data2– | |
| Pin 25 | TMDS Data2+ | |
| Pin 26 | TMDS Data2/4 Shield | |
| Pin 27 | TMDS Data4– | |
| Pin 28 | TMDS Data4+ | |
| Pin 29 | Clock+ | |
| Pin 30 | Clock- | |
| C1 | Analog Blue Video | |
| C2 | Analog Green Video | |
| C3 | Analog Horizontal Sync | |
| C4 | Analog Red Video | |
| C5 | Analog RGB Return and DDC Return | |
The Apple Display Connector (ADC) is a proprietary modification of the DVI connector that combines analog and digital video signals, USB, and power all in one cable. Apple used ADC for its LCD-based Apple Cinema Displays and their final CRT displays, before deciding to use standard DVI connectors on later models.
First implemented in the July 2000 Power Mac G4 and G4 Cube, ADC disappeared from displays in June 2004 when Apple introduced the aluminum-clad 20", 23", and 30" Apple Cinema Displays, which feature separate DVI, USB and FireWire connectors, and their own power supplies. The ADC was still standard on the Power Mac G5 until April 2005, when new models meant the only remaining Apple product with an ADC interface was the single processor Power Mac G5 introduced in October 2004. This single processor Power Mac G5 was discontinued soon after in June 2005.
Contents |
[edit] Compatibility issues
The Apple Display Connector, first debuted in the Apple Studio Display, is incompatible with the standard DVI connector, as was previously used in the PowerBook G4 and the older Power Mac G4. The Apple DVI to ADC Adapter[1], which cost $149US at launch but is now available for $99US[2], takes USB and DVI connections from the computer, together with power, and combines them into an ADC connection, allowing ADC monitors to be used with DVI-based machines.
When ADC was first implemented in some models of Power Mac G4s, Apple also removed all the DVI connectors from these computers, so the previous Mac owners cannot use DVI monitors without using ADC to DVI adapter.
The ADC can only carry 100 W of power, so it could not run the 19-inch or bigger CRTs that were widely available during ADC's debut, nor can it run contemporary flat panels marketed for home entertainment (many of which support DVI or VGA connections). The power limit was an important factor for Apple to abandon ADC when it launched the 30-inch Apple Cinema HD Display. Power is supplied to the ADC port by a finger connector on the video card, which plugs into a slot on the motherboard between the AGP slot and the back panel of the computer.
On newer displays lacking ADC, Apple still uses a single "ganged cable" that connects the separate signal cables to each other so they cannot tangle. This cable, however, employs standard DVI, power, USB and FireWire connectors, avoiding the problems of its predecessor.
[edit] References
- ^ Power Mac G4: Display Compatibility - Last Modified: May 28, 2008 / Article: HT1825 / Old Article: 58692
- ^ Apple Announces DVI to ADC Adapter - Connects Apple's Award-Winning Flat-Panel Displays with New PowerBook G4 — April 29, 2002
[edit] See also
[edit] External links
- The Electrical Interface for the ADC
- Apple Unveils All New Family of Displays to Complement Power Mac G4 Cube and Power Mac G4
|
||||||||||||||||||||
