AMS385-1.2 ADMOS [Advanced Monolithic Systems], AMS385-1.2 Datasheet

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AMS385-1.2

Manufacturer Part Number
AMS385-1.2
Description
MICROPOWER VOLTAGE REFERENCE DIODE
Manufacturer
ADMOS [Advanced Monolithic Systems]
Datasheet
FEATURES
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.
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.
ORDERING INFORMATION
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
The AMS285-1.2 is operational in the full industrial temperature range of -40 C to 85 C while AMS385-1.2 is operating
±4 mV (±0.3%) max. initial tolerance (A grade)
Operating Current 10 A to 20mA
Low Voltage Reference 1.235
Max. 0.6
Low Temperature Coefficient
2.5V Device and Adjustable Device also available
±4mV
±12mV AMS285-1.2BN
±25mV AMS285-1.2CN
±4mV
Advanced
Monolithic
Systems
AMS285-2.5 and AMS285 series, respectively
AMS385-2.5 and AMS385 series.
TOL.
±12mV AMS385-1.2BN
±25mV AMS385-1.2CN
AMS285-1.2AN
AMS385-1.2AN
Dynamic Impedance (A grade)
TO-92
:
AMS285-1.2AS
AMS285-1.2BS
AMS285-1.2CS
AMS385-1.2AS
AMS385-1.2BS
AMS385-1.2CS
PACKAGE TYPE
8 LEAD SOIC
AMS285-1.2AL
AMS285-1.2BL
AMS285-1.2CL
AMS385-1.2AL
AMS385-1.2BL
AMS385-1.2CL
MICROPOWER VOLTAGE REFERENCE DIODE
SOT-89
APPLICATIONS
AMS285-1.2/AMS385-1.2
Battery Powered Systems
Instrumentation
A/D, D/A Converters
Temperature measurement
Current sources
Notebook/Personal Computer
Monitors/ VCR/ TV
Pagers
TEMPERATURE RANGE
OPERATING
-40 to 85 C
-40 to 85 C
-40 to 85 C
0 to 70 C
0 to 70 C
0 to 70 C

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AMS385-1.2 Summary of contents

Page 1

... The AMS285-1.2 is operational in the full industrial temperature range of - while AMS385-1.2 is operating over temperature range. The AMS285-1.2/AMS385-1.2 are available in TO-92, SO-8 and SOT-89 packages. ...

Page 2

... Long Term Stability T =25°C±.1°C A (Note 1000 Hr Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS285-1.2/AMS385-1.2 30mA Storage temperature 10mA Soldering information TO-92 package: 10 sec. SOIC package: Vapor phase (60 sec) SOT-89 package: 10 sec. ...

Page 3

... Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 max is: j TO-92 SO-8 SOT-89 165°C/W 160°C/W 8L SOIC SO Package (S) N/C N/C N N/C N/C N/C Top View Micropower Reference from 9V Battery 9V 500k 1.2V AMS385-1.2 AMS285-1.2/AMS385-1 25° SOT-89 ( N/C Top View Reference from 1.5V Battery 1.5V 3k 1.2V AMS385-1.2 . The MAX and 1 - ...

Page 4

... C - 100 C Thermometer 1.3 TO 1.6V‡ OUT LM334 - 100 Calibration 1. Short AMS385-1.2, adjust R3 for I 1 Remove short, adjust R2 for correct reading in F Micropower* 10V Reference 15V LM4250C 150pF 22M AMS385-1 standby current ...

Page 5

... Precision 1mA Current Sources AMS385-1.2 C1 150pF - 7 6 LM312 4 + 1.5V TO 27V R2 -30V *I =1.23V/R2 OUT AMS285-1.2/AMS385-1.2 Seebeck R1 R2 Voltage Coefficient ( ) ( ) Across R1 (mV (mV) 52.3 523 1.24k 15.60 42.8 432 1k 12.77 40.8 408 953 12.17 6.4 63.4 150 1.908 AMS385-1.2 30V C1 R1 150pF 100k LM312 OUT Voltage Across R2 (mV) 14.32 11.78 11.17 1.766 ...

Page 6

... TEMPERATURE (° C) Noise Voltage 700 600 500 400 300 200 100 0 100k 10 100 1k 10k FREQUENCY (Hz) AMS285-1.2/AMS385-1.2 Forward Characteristics 1.2 0.8 T =-55° =25° 0.4 0 1.2 1.4 0.01 0.1 FORWARD CURRENT (mA) Reverse Dynamic Impedance 10k T =25° ...

Page 7

... TYP AMS285-1.2/AMS385-1.2 0.060±0.010 (1.524±0.254) 0.140±0.010 (3.556±0.127) 10° 5° NOM NOM 0.015±0.002 N (TO-92 ) AMS DRW# 042391 (0.381±0.051) 0.010-0.020 x 45° ...

Page 8

... PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued). 0.155-0.167 (3.94-4.25) 0.090-0.102 (2.29-2.60) 0.059 (1.50) BSC Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS285-1.2/AMS385-1.2 SOT-89 PLASTIC PACKAGE (L) 0.173-0.181 (4.40-4.60) 0.055-0.063 (1.40-1.60) 0.064-0.072 (1.62-1.83) 0.084-0.090 (2.13-2.29) ...

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