The ADR280 is a 1.2 V band gap core reference with excellent line regulation and power supply rejection designed specifically for applications experiencing heavy dynamic supply variations, such as data converter references in GSM, GPRS, and 3G mobile station applications. Devices such as the AD6535, which has an analog baseband IC with on-board baseband and audio codecs, voltage regulators, and battery charger, rely on the ADR280's ability to reject input battery voltage variations during RF power amplifier activity.