Apple's Lightning Digital AV Adapter is a Full-Fledged Computer
Panic, the developers behind apps like Coda and Transmit, spent some time disassembling the Lightning Digital AV cable that allows iOS devices like the iPad mini and the iPhone 5 to output HDMI to televisions.
The company discovered that, like its Lightning to 30-pin brethren, the Digital AV adapter is considerably more complicated than it would appear. Among other discoveries, Panic found an ARM chip and 256MB of RAM inside.
There are a lot of questions. What OS does it boot? @jmreid thinks the adapter copies over a “mini iOS” (!) from the device and boots it in a few seconds every time it’s connected, which would explain the fairly lengthy startup time for video out. Why do this crazy thing at all? All we can figure is that the small number of Lightning pins prevented them from doing raw HDMI period, and the elegance of the adapter trumped the need for traditional video out, so someone had to think seriously out of the box. Or maybe they want get as much functionality out of the iPad as possible to reduce cost and complexity.
Panic conjectures that for some reason the Lightning port isn't capable of outputting raw HDMI -- something that should give an extremely high quality image -- and instead uses a form of AirPlay to output video, delivering a lower quality video signal.
Update: Panic highlights this comment from an anonymous reader hinting at being an Apple engineer, which offers more details about how the adapter works and indicating that code updates are being made to improve the video quality.
The reason why this adapter exists is because Lightning is simply not capable of streaming a "raw" HDMI signal across the cable. Lightning is a serial bus. There is no clever wire multiplexing involved. Contrary to the opinions presented in this thread, we didn't do this to screw the customer. We did this to specifically shift the complexity of the "adapter" bit into the adapter itself, leaving the host hardware free of any concerns in regards to what was hanging off the other end of the Lightning cable. [...]
Certain people are aware that the quality could be better and others are working on it. For the time being, the quality was deemed to be suitably acceptable. Given the dynamic nature of the system (and the fact that the firmware is stored in RAM rather then ROM), updates **will** be made available as a part of future iOS updates. When this will happen I can't say for anonymous reasons, but these concerns haven't gone unnoticed.
Popular Stories
iOS 18.3 should be released to the public next week, following beta testing since mid-December. While the software update is a relatively minor one, it still includes a handful of new features, changes, and bug fixes for iPhones.
Below, we recap everything new in iOS 18.3.
Notification Summary Changes
Examples of inaccurate Apple Intelligence notification summaries
Apple Intelligence...
Apple is set to release iOS 18.3 next week, bringing further refinements to Apple Intelligence features, a couple of neat new capabilities to iPhone 15 Pro and iPhone 16 devices, and bug fixes.
While not quite as packed with new features as Apple's preceding iOS 18 point releases, iOS 18.3 still introduces capabilities that aim to make your iPhone smarter and more intuitive. Below, we've...
iOS 18.3 is expected to be widely released next week, and that means the first iOS 18.4 beta for iPhones should be just around the corner.
Apple has previously implied that iOS 18.4 will be released in April, as that is when it promised to make Apple Intelligence available in even more languages.
Below, we outline what to expect from iOS 18.4 so far.
Apple Intelligence for Siri
Siri ...
Walmart still does not accept Apple Pay or other NFC payments at its more than 4,600 stores across the U.S., and it stood firm on its reasoning for that today.
A spokesperson for Walmart today informed MacRumors that its position on contactless payments has not changed since we last reached out about the matter in 2022. The big-box retailer said it remains focused on its own convenient...
A new Apple TV is expected to be released later this year. In this article, we recap rumored features and changes for the device.
The next Apple TV will be equipped with Apple's own combined Wi-Fi and Bluetooth chip, according to Bloomberg's Mark Gurman. He said the chip supports Wi-Fi 6E, which would be an upgrade over the current Apple TV's standard Wi-Fi 6 support. Wi-Fi 6E extends the...
Apple provided developers and public beta testers with the release candidate version of iOS 18.3 today, and with it comes release notes confirming what's new. While we knew about several of the features that are in the update, there are some lesser known tweaks and bug fixes.
The update adds new Visual Intelligence features for iPhone 16 models, it tweaks Notification summaries on all...
The upcoming iPhone 17 models that Apple plans to release this year will not feature a smaller Dynamic Island, Apple analyst Ming-Chi Kuo said today.
On social media, he said that he is expecting the size of the Dynamic Island to remain "largely unchanged" across the iPhone 17 lineup. His statement is contrary to prior rumors that we've heard about planned changes for the iPhone 17 models.
...
It's also time for Apple's first product announcement of the year.
Last year, Apple said it would be launching Powerbeats Pro 2 in 2025, and the wireless earbuds are expected to launch very soon.
Powerbeats Pro 2 images found in iOS 18 code
In his Power On newsletter last weekend, Bloomberg's Mark Gurman said the Powerbeats Pro 2 are "due imminently." In addition to Apple filing the...
Apple's retail stores will be rolling out "merchandise/floor marketing updates" next week, according to Bloomberg's Mark Gurman.
Gurman did not explicitly say if the store updates are related to any upcoming product announcements, but he did mention that next week is around the time that Apple rolls out its annual Black Unity watch band for the Apple Watch.
In each of the past four years, ...
