Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

Advanced

AMS285/AMS385

Monolithic

ADJUSTABLE MICROPOWER VOLTAGE REFERENCE DIODE

Systems

FEATURES

APPLICATIONS

•• Adjustable from 1.24V to 5.30V

•• Battery Powered Systems

•• Operating Current 10µµA to 20mA

•• Instrumentation

•• 1% and 2% Initial Tolerance

•• A/D, D/A Converters

•• 1Ω

Ω Dynamic Impedance

•• Temperature measurement

•• Low Temperature Coefficient

•• Current sources

•• 1.2V Device and 2.5V Device also available

•• Notebook/Personal Computer

AMS285-1.2 and AMS285-2.5 series, respectively

•• Monitors/ VCR/ TV

AMS385-1.2 and AMS385-2.5 series.

•• Pagers

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 life approaching shelf life.

Further more, the wide operating current allows it to replace older references with a tight tolerance part.

The AMS285 is operational in the full industrial temperature range of -40

°C to 85°C while AMS385 is operating over a 0°C

to 70

°C temperature range. The AMS285/AMS385 are available in TO-92, SO-8 and SOT-89 packages.

ORDERING INFORMATION:

TOL.

PACKAGE TYPE

OPERATING

TO-92

8 LEAD SOIC

SOT-89

TEMPERATURE RANGE

±

12mV

AMS285AN

AMS285AS

AMS285AL

-40 to 85

° C

±

25mV

AMS285BN

AMS285BS

AMS285BL

-40 to 85

° C

±

25mV

AMS285CN

AMS285CS

AMS285CL

-40 to 85

° C

±

12mV

AMS385AN

AMS385AS

AMS385AL

0 to 70

° C

±

25mV

AMS385BN

AMS385BS

AMS385BL

0 to 70

° C

±

25mV

AMS385CN

AMS385CS

AMS385CL

0 to 70

° C