AMS285

Advanced Monolithic Systems FEATURES AMS285/AMS385 ADJUSTABLE MICROPOWER VOLTAGE REFERENCE DIODE APPLICATIONS Battery Powered Systems Instrumentation A/D, D/A Converters Temperature measurement Current sources Notebook/Personal Computer Monitors/ VCR/ TV Pagers Adjustable from 1.24V to 5.30V Operating Current 10µ A to 20mA 1% and 2% Initial Tolerance 1Ω Dynamic Impedance Low Temperature Coefficient 1.2V Device and 2.5V Device also available AMS285-1.2 and AMS285-2.5 series, respectively AMS385-1.2 and AMS385-2.5 series. GENERAL DESCRIPTION The AMS285/AMS385 are three-terminal micropower band-gap voltage reference diodes. They feature a very low dynamic impedance and good temperature coefficient, operating from 1.24V to 5.3V and over a 10µA to 20mA current range. On-chip trimming is used to provide tight voltage tolerance. Since the AMS285/AMS385 is a band-gap reference, uses only transistors and resistors, low noise and good long-term stability result. Careful design of the AMS285/AMS385 has made the device exceptionally tolerant of capacitive loading, making it easy to use in almost any reference application. The wide dynamic operating range allows its use with widely varying supplies with excellent regulation. The extremely low power drain of the AMS285/AMS385 makes these reference diodes useful for micropower circuitry. These voltage references can be used to make portable meters, regulators or general purpose analog circuitry with battery l...