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Analog Devices - 1.2 V Ultralow Power High PSRR Voltage Reference

Numéro de référence DR280
Description 1.2 V Ultralow Power High PSRR Voltage Reference
Fabricant Analog Devices 
Logo Analog Devices 





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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 A Maximum
Temperature Coefficient, 40 ppm/oC 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
GSM, GPRS, 3G Mobile Stations
Portable Battery-Operated Electronics
Low Voltage Converter References
Wireless Devices
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, 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.
In addition to mobile stations, the ADR280 is suitable for a
variety of general-purpose applications. Most band gap refer-
ences include internal gain for specific outputs, which simplifies
the user’s design but compromises on the cost, form factor, and
flexibility. The ADR280, on the other hand, optimizes the band
gap core voltage and allows users to tailor the voltage, current, or
transient response by simply adding their preferred op amps.
The ADR280 operates on a wide supply voltage range from 2.4V
to 5.5 V. It is available in compact 3-lead SOT-23 and SC70
packages. The device is specified over the extended industrial
temperature range of –40°C to +85°C.
1.2 V Ultralow Power
High PSRR Voltage Reference
ADR280
PIN CONFIGURATIONS
3-Lead SOT-23
(RT Suffix)
V+ 1
ADR280 3 V–
VOUT 2
3-Lead SC70
(KS Suffix)
VOUT 1
ADR280 3 V–
V+ 2
15
10
5
3V TO 5V
0
–5
–10
–15
–40
–20
0
20 40
60
TEMPERATURE (C)
80 100
Figure 1. Line Regulation vs.Temperature
REV. A
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 rights of third parties
that may result from its use. No license is granted by implication or oth-
erwise under any patent or patent rights of Analog Devices.Trademarks
and registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© 2003 Analog Devices, Inc. All rights reserved.

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