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

Advanced

AMS285-1.2/AMS385-1.2

Monolithic

MICROPOWER VOLTAGE REFERENCE DIODE

Systems

FEATURES

APPLICATIONS

•• ±4 mV (±0.3%) max. initial tolerance (A grade)

•• Battery Powered Systems

•• Operating Current 10µµA to 20mA

•• Instrumentation

•• Low Voltage Reference 1.235

•• A/D, D/A Converters

•• Max. 0.6Ω

Ω Dynamic Impedance (A grade)

•• Temperature measurement

•• Low Temperature Coefficient

•• Current sources

•• 2.5V Device and Adjustable Device also available

•• Notebook/Personal Computer

AMS285-2.5 and AMS285 series, respectively

•• Monitors/ VCR/ TV

AMS385-2.5 and AMS385 series.

•• Pagers

GENERAL DESCRIPTION

The AMS285-1.2/AMS385-1.2 are two-terminal micropower band-gap voltage reference diodes. They feature a very low

dynamic impedance and good temperature coefficient, operating over a 10µA to 20mA current range. On-chip trimming is

used to provide tight voltage tolerance. Since the AMS285-1.2/AMS385-1.2 is a band-gap reference, uses only transistors and

resistors, low noise and good long-term stability result. Careful design of the AMS285-1.2/AMS385-1.2 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

AMS285-1.2/AMS385-1.2 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 AMS285-1.2 is operational in the full industrial temperature range of -40

°C to 85°C while AMS385-1.2 is operating

over a 0

°C to 70°C temperature range. The AMS285-1.2/AMS385-1.2 are available in TO-92, SO-8 and SOT-89 packages.

TOL.

PACKAGE TYPE

OPERATING

TO-92

8 LEAD SOIC

SOT-89

TEMPERATURE RANGE

±

4mV

AMS285-1.2AN

AMS285-1.2AS

AMS285-1.2AL

-40 to 85

° C

±

12mV AMS285-1.2BN

AMS285-1.2BS

AMS285-1.2BL

-40 to 85

° C

±

25mV AMS285-1.2CN

AMS285-1.2CS

AMS285-1.2CL

-40 to 85

° C

±

4mV

AMS385-1.2AN

AMS385-1.2AS

AMS385-1.2AL

0 to 70

° C

±

12mV AMS385-1.2BN

AMS385-1.2BS

AMS385-1.2BL

0 to 70

° C

±

25mV AMS385-1.2CN

AMS385-1.2CS

AMS385-1.2CL

0 to 70

° C