Published on Nov 14, 2015
The iPad is a tablet computer designed and developed by Apple. It is particularly marketed for consumption of media such as books and periodicals, movies, music, and games, and for general web and e-mail access.
At around 700 grams its size and weight are intermediate between most contemporary smartphones and laptop computers. Sales of the iPad tablet are strong. Since its release in April 2010, Apple has sold 3 million iPads. The iPad runs the same operating system as the previously introduced iPod Touch and iPhone (initially iPhone OS 3.2, with an update to iOS 4 announced for Fall 2010). Likewise, it is controlled by a multitouch display sensitive to fingertip contact with up to eleven fingers. This is unlike most previous tablet computers which instead used a pressuretriggered stylus. It runs iPad-specific applications as well as those written for the iPhone and iPod Touch, including e-book readers.
The iPad uses Wi-Fi or a 3G mobile data connection to browse the Internet, load and stream media, and install software. A USB cable is required to sync the iPad with iTunes on a personal computer, by which the device is managed. Media reaction to the device has generally been neutral or positive, though some media and users liken the device to an unfinished product due to the lack of multitasking and limitations of iPhone OS 3.2.Apple is best known for the hardware products which includes mac computers ,iphone the ipod and now another revolutionary product called the Ipad.
It is particularly marketed as a platform for audio and visual media such as books, periodicals, movies, music, and games as well as web content. It has been designed to fill the illusive gap between the notebooks and the smartphones. It has got the features of both the laptops and the iphone . Like iPhone and iPod Touch, the iPad is controlled by a multitouch display — a break from most previous tablet computers, which used a pressure-triggered stylus. All of the built-in apps on iPad were designed from the ground up to take advantage of the large Multi-Touch screen and advanced capabilities of iPad. And they work in any orientation. So you can do things with these apps that you can’t do on any other device. Its hard to believe how something so thin and light can be so capable.
Hardware Components of the iPAD
The iPad's touchscreen display is a 25 cm (9.7 in) liquid crystal display (1024 × 768 pixels) with fingerprint-resistant and scratch-resistant glass. Like the iPhone, the iPad is designed to be controlled by bare fingers; normal gloves and styli that prevent electrical conductivity may not be used, although there are special gloves and styli designed for this use.
The display responds to two other sensors: an ambient light sensor to adjust screen brightness and a 3-axis accelerometer to sense iPad orientation and switch between portrait and landscape modes. Unlike the iPhone and iPod touch built-in applications, which work in three orientations (portrait, landscape-left and landscape-right), the iPad built-in applications support screen rotation in all four orientations (the three aforementioned ones along with upside-down), meaning that the device has no intrinsic "native" orientation; only the relative position of the home button changes.
The iPad has a switch to lock out the screen rotation function (reportedly to prevent unintended rotation when the user is lying down) There are a total of four physical switches, including a home button below the display that returns the user to the main menu, and three plastic physical switches on the sides:wake/sleep and volume up/down , along with the screen rotation lock. Ars Technica noted the similarity between the iPad and Star Trek's fictional PADD tablet computer, both in name and functionality
Audio and Output
The iPad has two internal speakers that push mono sound through two small sealed channels to the three audio ports carved into the bottom-right of the unit. A volume switch is on the right side of the unit. A 3.5-mm TRS connector audio-out jack on the top-left corner of the device provides stereo sound for headphones with or without microphones and/or volume controls. The iPad also contains a microphone that can be used for voice recording. The builtin Bluetooth 2.1 + EDR interface allows wireless headphones and keyboards to be used with the iPad. However, the iOS does not currently support file transfer via Bluetooth. iPad also features 1024 x 768 VGA video output for connecting an external display or television.
1 GHZ Apple A4,ARM processor is used for the high performance of the ipad .The Apple A4 is a package on package (PoP) system-on-a-chip (SoC) designed by Apple and manufactured by Samsung. It combines an ARM based CPU with a PowerVR GPU with an emphasis on power efficiency.The chip commercially debuted with the release of Apple's iPad tablet. followed shortly by the iPhone 4 smartphone, the 4th generation iPod Touch and the 2nd generation Apple TV.
Apple A4 is based on the ARM processor architecture. The first version released runs at 1 GHz and contains a Cortex-A8 CPU core paired with a PowerVR SGX 535 graphics processor (GPU) built on Samsung's 45 nm process. The Cortex-A8 core used in the A4 is thought to use performance enhancements developed by chip designer Intrinsity (which was subsequently acquired by Apple) in collaboration with Samsung. The resulting core, dubbed "Hummingbird", is able to run at far higher clock rates than other implementations while remaining fully compatible with the Cortex-A8 design provided by ARM. Other performance improvements include additional L2 cache. The same Cortex-A8 CPU core used in the A4 is also used in Samsung's S5PC110A01 SoC.
The A4 processor package does not contain RAM, but supports PoP installation. The top package of the A4 used in the iPad & iPod touch 4th gen contains two low-power 128 MBDDR SDRAM chips for a total of 256MB RAM. For the iPhone 4 there are two chips of 256 MB for a total of 512 MB. RAM is connected to the processor using ARM's 64-bit-wide AMBA 3 AXI bus.
This is twice the width of the RAM data bus used in previous ARM 11 and ARM 9 based Apple devices, to support the greater need for graphics bandwidth in the iPad. Products that include A4 ARM processor:
Apple iPad — April 2010,
Apple iPhone 4 — June 2010,
Apple iPod Touch 4th gen — September 2010,
Apple TV (2010) — September 2010.
Power and Battery
The iPad uses an internal rechargeable lithium-ion polymer battery. The batteries are made in Taiwan by Simplo Technology, which makes 60% of them, and Dynapack International Technology. The iPad is designed to be charged with a high current (2 amperes) using the included USB 10 W power adapter. While it can be charged by a standard USB port from a computer, these are limited to 500 milliamperes (half an amp). As a result, if the iPad is turned on while being charged with a normal USB computer port, it will charge much more slowly, if at all. Apple claims that the iPad's battery can provide up to 10 hours of video, 140 hours of audio playback, or one month on standby.
Like any battery technology, the iPad's LiPo battery loses capacity over time, but is not designed to be user-replaceable. In a program similar to the battery-replacement program for the iPod and the original iPhone, Apple will replace an iPad that does not hold an electrical charge with a refurbished iPad for a fee of US$99 (plus $6.95 shipping). The battery backup which was a major issue in the previous products of apple, seems to have sorted out the problems to some extent because in the ipad the backup is pretty impressive and a good response from the user side.This is one of the advantage that the ipad have over the ipod .
The Apple iPad makes a great second computer. Pair it with a high-powered desktop and you'll have a setup that gives you what you need: both power and portability. You can have a desktop in your homeoffice with a huge screen and no real constraints for heavy lifting -- gaming, video encoding, that sort of thing -- and an iPad for thing like Facebook and email when you're in the living room. Plus it won't get too hot to hold in your lap, and you won't have to keep it plugged in. It is also a good solution for someone who does a bit of traveling, either for pleasure or work.
This would be a great computer to take on vacation; you can keep up with your friends and maybe look in at the office, or keep yourself entertained on rainy days with a movie or two. And with its small size and light weight it won't double the size of your suitcase.apple ipad is a new generation device capable of endless possibilities.with the improved version of ipad and some new features added it will be a great replacement for the laptops.so we will see more and more of this device in future .
1. Block, Ryan. Live from Macworld 2007
2. ―Inside the Apple iPad". Electronic Design. April 5, 2010
3. Rich Trenholm (January 27, 2010). "Apple iPad launch: The first specs"
4. "What’s Up The Sleeves of the Apple iPad – Apple iPad Specifications‖ Laptop Reviews UK
5. Ars Technica.
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