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.
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 2.4 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.
Data Sheet, Rev. C, 4/07
Essential companion part for AD6535 for handset applications. It also can be used as a general purpose part where low noise and low power reference is needed. Its tiny SC70 package makes it ideal for hand held devices applications.
|Title||Content Type||File Type|
|ADR280: 1.2 V Ultralow Power High PSRR Voltage Reference Data Sheet (Rev C, 04/2007) (pdf, 842 kB)||Data Sheets|
|AN-713: The Effect of Long-Term Drift on Voltage References (pdf, 237 kB)||Application Notes|
|CN-0145: 4 mA-to-20 mA Loop-Powered Temperature Monitor Using the ADuC7060/ADuC7061 Precision Analog Microcontroller (pdf, 268 kB)||Circuit Note|
|CN-0029: 8 to 16 Channels of Programmable Voltage with Excellent Temperature Drift Performance Using the AD5390/AD5391/AD5392 DACs (pdf, 89 kB)||Circuit Note|
|RAQs index||Rarely Asked Questions||HTML|
|What do I need to know about selecting and using Voltage References?||FAQs/RAQs||HTML|
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|Voltage Reference Selection & Evaluation Wizard||Design Calculators||HTML|
Voltage Reference Wizard (downloadable)
This Wizard helps you select the most suitable voltage for a use with a data converter. Supply the Wizard with a given data converter; it will provide you with a number of suitable references plus the maximum DC error contributed to your overall system. Or enter the amount of DC error your system can tolerate and find out which of ADI’s reference and data converter pairs will meet your requirement.
Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.
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