1.2 V Ultralow Power High PSRR Voltage Reference ADR280 FEATURES PIN CONFIGURATIONS 1.2 V precision output V+ 1 Excellent line regulation: 2 ppm/V typical ADR280 High power supply ripple rejection: 80 dB at 220 Hz 3 V Ultralow power supply current: 16 A maximum V 2 OUT Temperature coefficient: 40 ppm/C maximum Low noise, 12.5 nV/Hz typical Figure 1. 3-Lead SOT-23 Operating supply range, 2.4 V to 5.5 V (RT Suffix) Compact 3-lead SOT-23 and SC70 packages V 1 OUT APPLICATIONS ADR280 3 V List GSM, GPRS, 3G mobile stations Portable battery-operated electronics V+ 2 Low voltage converter references Wireless devices Figure 2. 3-Lead SC70 (KS Suffix) GENERAL DESCRIPTION The ADR280 is a 1.2 V band gap core reference with excellent 15 line regulation and power supply rejection designed specifically for applications experiencing heavy dynamic supply variations, 10 such as data converter references in GSM, GPRS, and 3G mobile station applications. Devices such as the AD6535 that 5 have an analog baseband IC with on-board baseband, audio 3V TO 5V codecs, voltage regulators, and battery chargers rely on the 0 ability of the ADR280 to reject input battery voltage variations during RF power amplifier activity. 5 In addition to mobile stations, the ADR280 is suitable for a 10 variety of general-purpose applications. Most band gap refer- ences include internal gain for specific outputs, which simplifies 15 the users design, but compromises on the cost, form factor, and 40 20 0 20 40 60 80 100 flexibility. The ADR280, on the other hand, optimizes the band TEMPERATURE (C) gap core voltage and allows users to tailor the voltage, current, Figure 3. Line Regulation vs. Temperature or transient response by simply adding their preferred op amps. The ADR280 operates on a wide supply voltage range from 2.4 V to 5.5 V. It is available in compact 3-lead SOT-23 and SC70 packages. The device is specified over the extended indus- trial temperature range of 40C to +85C. Rev. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 20022007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. LINE REGULATION (ppm/V) 03065-002 03065-001 03065-003ADR280 TABLE OF CONTENTS Features .............................................................................................. 1 Thermal Resistance.......................................................................4 Applications....................................................................................... 1 ESD Caution...................................................................................4 General Description ......................................................................... 1 Typical Performance Characteristics ..............................................5 Pin Configurations ........................................................................... 1 Theory of Operation .........................................................................7 Revision History ............................................................................... 2 Applications Information .................................................................8 Specifications..................................................................................... 3 Low Cost, Low Power Current Source .......................................8 Electrical Characteristics............................................................. 3 Outline Dimensions....................................................................... 10 Absolute Maximum Ratings............................................................ 4 Ordering Guide .......................................................................... 11 REVISION HISTORY 4/07Rev. B to Rev. C 6/03Rev. 0 to Rev. A Updated Format..................................................................Universal Added SC70 package..........................................................Universal Changes to Figure 1, Figure 2.......................................................... 1 Changes to Features ..........................................................................1 Deleted Pin Function Descriptions Section and Pin Changes to General Description .....................................................1 Configurations Section .................................................................... 2 Changes to Specifications.................................................................2 Changes to Figure 20 and Figure 21............................................... 9 Changes to Ordering Guide .............................................................2 Updated Outline Dimensions ....................................................... 10 Changes to TPCs 4, 6, and 7 ............................................................3 Updated SOT-23 Outline Dimensions ...........................................7 10/04Rev. A to Rev. B 11/02Revision 0: Initial Version Changes to Pin Configurations.........................................Universal Changes to Ordering Guide ............................................................ 2 Changes to Outline Dimensions..................................................... 7 Rev. C Page 2 of 12