ADMOS AMS385-2.5CS, AMS385-2.5CN, AMS385-2.5CL, AMS385-2.5BS, AMS385-2.5BN Datasheet
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Advanced AMS285-2.5/AMS385-2.5
Monolithic MICROPOWER VOLTAGE REFERENCE DIODE
Systems
FEATURES APPLICATIONS
•• ±20 mV (±0.8%) max. initial tolerance (A grade) •• Battery Powered Systems
•• Operating Current 20µµA to 20mA •• Instrumentation
•• Low Voltage Reference 2.5V •• A/D, D/A Converters
•• Max. 0.6ΩΩ Dynamic Impedance (A grade) •• Temperature measurement
•• Low Temperature Coefficient •• Current sources
•• 1.2V Device and Adjustable Device also available •• Notebook/Personal Computer
AMS285-1.2 and AMS285 series, respectively
AMS385-1.2 and AMS385 series.
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.
•• Monitors/ VCR/ TV
•• Pagers
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. PACKAGE TYPE OPERATING
TO-92 8 LEAD SOIC SOT-89
±20mV AMS285-2.5AN AMS285-2.5AS AMS285-2.5AL
±38mV AMS285-2.5BN AMS285-2.5BS AMS285-2.5BL
±75mV AMS285-2.5CN AMS285-2.5CS AMS285-2.5CL
±20mV AMS385-2.5AN AMS385-2.5AS AMS385-2.5AL
±38mV AMS385-2.5BN AMS385-2.5BS AMS385-2.5BL
±75mV AMS385-2.5CN AMS385-2.5CS AMS385-2.5CL
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 Storage temperature
Forward Current 10mA Soldering information
Operating Temperature Range TO-92 package: 10 sec.
AMS285-2.5
AMS385-2.5
-40°C to 85°C
0°C to 70°C
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IR = 100 µA, and TA = +25°C unless otherwise specified.
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
Parameter Conditions
Reverse Breakdown
Voltage (Note 4)
Reverse Dynamic
Impedance (Note 4)
Reverse Breakdown
Voltage Change with
current (Note 4)
Min. Operating
Current (Note 4)
Wide Band Noise
(Note 5)
Temperature Coeff.
(Note 6)
Long Term Stability
(Note 5)
IR - 100 µA
IR - 100 µA, f =20Hz
10µA ≤IR ≤1mA
1mA ≤IR ≤20mA
IR - 100 µA,
10Hz ≤ f ≤ 10kHz
TA=25°C±.1°C
T = 1000 Hr
AMS285A-2.5
Min Typ Max
2.480 2.500 2.520 2.462 2.500 2.538 2.425 2.500 2.575 V
0.2 0.60 1 1
1.0
10
12 18
20
120 120 120
25 50 100 150
20 20 20 ppm
AMS285B-2.5
Min Typ Max
13 20
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IR = 100 µA, and TA = +25°C unless otherwise specified.
Parameter Conditions
Reverse Breakdown
Voltage (Note 4)
Reverse Dynamic
Impedance (Note 4)
Reverse Breakdown
Voltage Change with
Current (Note 4)
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 2.462 2.500 2.538 2.425 2.500 2.575 V
0.2 0.60 1 1
1.0
10
AMS385B-2.5
Min Typ Max
2.0
20
1.0
10
30
AMS285C-2.5
Min Typ Max
2.0
20
13 20
30
AMS385C-2.5
Min Typ Max
2.0
20
Units
Ω
mV
µA
µA
µV
ppm/°C
Units
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
120 120 120
25 50 100 150
20 20 20 ppm
13 20
30
13 20
30
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
µA
µA
µV
ppm/°C
AMS285-2.5/AMS385-2.5
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The
guaranteed specifications apply only for the test conditions listed.
Note 2: For elevated temperature operation, T
AMS285 +125°C
AMS385 +100°C
max is:
j
Thermal Resistance TO-92 SO-8 SOT-89
ϕ
(junction to ambient)
JA
Note 3: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at T
170°C/W (0.125” leads) 165°C/W 160°C/W
= TJ = 25°C.
A
Note 4: Guaranteed and 100% production tested.
Note 5: Guaranteed but not 100% production tested. These limits are not used to calculate average outgoing quality levels.
Note 6: The average temperature coefficient is defined as the maximum deviation of reference voltage at all measured temperatures between the operating T
T
, divided by T
MIN
MAX
- T
. The measured temperatures are 0°C, 25°C, 70°C and 85°C.
MIN
PIN CONNECTIONS
TO-92 8L SOIC SOT-89
Plastic Package (N) SO Package (S) (L)
N/C N/CN/C
+
123
Bottom View Top View Top View
8437 56
1 2
N/C N/C N/C
123
-
N/C
-+
MAX and
TYPICAL APPLICATIONS
Wide Input Micropower Reference
Range Reference from 9V Battery
VIN = 3.7V TO 30V
LM334
3.3k
OUT
2.5V
AMS385-2.5
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
9V
200k
2.5V
AMS385-2.5
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