Datasheet ADR280 (Analog Devices)

1.2 V Ultralow Power High PSRR Voltage Reference ADR280 FEATURES PIN CONFIGURATIONS 1.2 V precision output Excellent line regulation: 2 ppm/V typical V+ 1 High power supply ripple rejection: –80 dB at 220 Hz ADR280 3 V– Ultralow power supply current: 16 μA maximum VOUT 2
01
Temperature coefficient: 40 ppm/°C maximum
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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 APPLICATIONS VOUT 1 ADR280 List GSM, GPRS, 3G mobile stations 3 V– Portable battery-operated electronics V+ 2
02 -0
Low voltage converter references
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Wireless devices
Figure 2. 3-Lead SC70 (KS Suffix)
GENERAL DESCRIPTION
The ADR280 is a 1.2 V band gap core reference with excellent
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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
) /V
mobile station applications. Devices such as the AD6535 that
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have an analog baseband IC with on-board baseband, audio
N ( 3V TO 5V
codecs, voltage regulators, and battery chargers rely on the
IO T A 0
ability of the ADR280 to reject input battery voltage variations
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during RF power amplifier activity.
RE –5
In addition to mobile stations, the ADR280 is suitable for a
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variety of general-purpose applications. Most band gap refer-
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ences include internal gain for specific outputs, which simplifies the user’s design, but compromises on the cost, form factor, and
–15
03
–40 –20 0 20 40 60 80 100
0 5- flexibility. The ADR280, on the other hand, optimizes the band
TEMPERATURE (°C)
06 03 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 −40°C to +85°C.
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 license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 www.analog.com Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 ©2002–2007 Analog Devices, Inc. All rights reserved.
Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION PIN CONFIGURATIONS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ELECTRICAL CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION APPLICATIONS INFORMATION LOW COST, LOW POWER CURRENT SOURCE Precision Low Power Current Source Boosted Current Source Negative Reference Boosted Reference with Scalable Output GSM and 3G Mobile Station Applications OUTLINE DIMENSIONS ORDERING GUIDE