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Advanced Monolithic Systems |
Advanced
Monolithic
Systems
AMS285-2.5/AMS385-2.5
MICROPOWER VOLTAGE REFERENCE DIODE
FEATURES
• ±20 mV (±0.8%) max. initial tolerance (A grade)
• Operating Current 20µA to 20mA
• Low Voltage Reference 2.5V
• Max. 0.6Ω Dynamic Impedance (A grade)
• Low Temperature Coefficient
• 1.2V Device and Adjustable Device also available
AMS285-1.2 and AMS285 series, respectively
AMS385-1.2 and AMS385 series.
APPLICATIONS
• Battery Powered Systems
• Instrumentation
• A/D, D/A Converters
• Temperature measurement
• Current sources
• Notebook/Personal Computer
• Monitors/ VCR/ TV
• Pagers
GENERAL DESCRIPTION
The AMS285-2.5/AMS385-2.5 are two-terminal micropower band-gap voltage reference diodes. They feature a very low
dynamic impedance and good temperature coefficient, operating over a 20µA to 20mA current range. On-chip trimming is
used to provide tight voltage tolerance. Since the AMS285-2.5/AMS385-2.5 is a band-gap reference, uses only transistors and
resistors, low noise and good long term stability result. Careful design of the AMS285-2.5/AMS385-2.5 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
AMS285-2.5/AMS385-2.5 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 AMS285-2.5 is operational in the full industrial temperature range of -40°C to 85°C while AMS385-2.5 is operating
over a 0°C to 70°C temperature range. The AMS285-2.5/AMS385-2.5 are available in TO-92, SO-8 and SOT-89 packages.
ORDERING INFORMATION:
TOL.
TO-92
±20mV
±38mV
±75mV
±20mV
±38mV
±75mV
AMS285-2.5AN
AMS285-2.5BN
AMS285-2.5CN
AMS385-2.5AN
AMS385-2.5BN
AMS385-2.5CN
PACKAGE TYPE
8 LEAD SOIC
AMS285-2.5AS
AMS285-2.5BS
AMS285-2.5CS
AMS385-2.5AS
AMS385-2.5BS
AMS385-2.5CS
SOT-89
AMS285-2.5AL
AMS285-2.5BL
AMS285-2.5CL
AMS385-2.5AL
AMS385-2.5BL
AMS385-2.5CL
OPERATING
TEMPERATURE RANGE
-40 to 85° C
-40 to 85° C
-40 to 85° C
0 to 70° C
0 to 70° C
0 to 70° C
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS285-2.5/AMS385-2.5
ABSOLUTE MAXIMUM RATINGS
Reverse Current
30mA
Forward Current
10mA
Operating Temperature Range
AMS285-2.5
-40°C to 85°C
AMS385-2.5
0°C to 70°C
Storage temperature
Soldering information
TO-92 package: 10 sec.
SOIC package: Vapor phase (60 sec)
Infrared (15 sec.)
SOT-89 package: 10 sec.
-55°C to +150°C
260°C
215°C
220°C
265°C
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IR = 100 µA, and TA = +25°C unless otherwise specified.
Parameter
Reverse Breakdown
Voltage (Note 4)
Reverse Dynamic
Impedance (Note 4)
Reverse Breakdown
Voltage Change with
current (Note 4)
Conditions
IR - 100 µA
IR - 100 µA, f =20Hz
10µA ≤IR ≤1mA
1mA ≤IR ≤20mA
AMS285A-2.5
Min Typ Max
2.480
2.500
2.520
0.2 0.60
1.0
10
AMS285B-2.5
Min Typ
Max
2.462
2.500
2.538
1
1.0
10
AMS285C-2.5
Min Typ Max
2.425 2.500 2.575
1
2.0
20
Units
V
Ω
mV
Min. Operating
Current (Note 4)
Wide Band Noise
(Note 5)
Temperature Coeff.
(Note 6)
Long Term Stability
(Note 5)
IR - 100 µA,
10Hz ≤ f ≤ 10kHz
TA=25°C±.1°C
T = 1000 Hr
12 18
20
120
25
20
13 20
30
120
50
20
13 20 µA
30 µA
120 µV
100 150 ppm/°C
20 ppm
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IR = 100 µA, and TA = +25°C unless otherwise specified.
Parameter
Reverse Breakdown
Voltage (Note 4)
Reverse Dynamic
Impedance (Note 4)
Reverse Breakdown
Voltage Change with
Current (Note 4)
Conditions
IR - 100 µA
IR - 100 µA, f =20Hz
10µA ≤IR ≤1mA
1mA ≤IR ≤20mA
AMS385A-2.5
Min Typ Max
2.480
2.500
2.520
0.2 0.60
1.0
10
AMS385B-2.5
Min Typ
Max
2.462
2.500
2.538
1
2.0
20
Min. Operating
Current (Note 4)
12 18
20
13 20
30
Wide Band Noise
(Note 5)
IR - 100 µA,
10Hz ≤ f ≤ 10kHz
120
120
Temperature Coeff.
(Note 6)
25 50
Long Term Stability
(Note 5)
TA=25°C±.1°C
T = 1000 Hr
20
20
AMS385C-2.5
Min Typ Max
2.425
2.500
2.575
1
2.0
20
13 20
30
120
100 150
20
Units
V
Ω
mV
µA
µA
µV
ppm/°C
ppm
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
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