GENERAL DESCRIPTION
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 that have an analog baseband IC with on-board baseband, audio codecs, voltage regulators, and battery chargers rely on the ability of the ADR280 to reject input battery voltage variations during RF power amplifier activity.

FEATURES
   1.2 V precision output
   Excellent line regulation: 2 ppm/V typical
   High power supply ripple rejection: –80 dB at 220 Hz
   Ultralow power supply current: 16 μA maximum
   Temperature coefficient: 40 ppm/°C maximum
   Low noise, 12.5 nV/√Hz typical
   Operating supply range, 2.4 V to 5.5 V
   Compact 3-lead SOT-23 and SC70 packages

APPLICATIONS
   List GSM, GPRS, 3G mobile stations
   Portable battery-operated electronics
   Low voltage converter references
   Wireless devices