Original: 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 . It was superseded in the second-generation iPad , released the following year , by the Apple A5 processor .
Simplified: The Apple A4 is a microprocessor designed by Apple and manufactured by Samsung and first used in the iPad tablet computer , then in the iPhone 4 smartphone .