ADMOS AMS385-1.2CS, AMS385-1.2CN, AMS385-1.2CL, AMS385-1.2BS, AMS385-1.2BN Datasheet
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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. 0.6ΩΩ 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
AMS385-2.5 and AMS385 series.
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.
•• Monitors/ VCR/ TV
•• Pagers
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.
ORDERING INFORMATION:
TOL. PACKAGE TYPE OPERATING
TO-92 8 LEAD SOIC SOT-89
±4mV AMS285-1.2AN AMS285-1.2AS AMS285-1.2AL
±12mV AMS285-1.2BN AMS285-1.2BS AMS285-1.2BL
±25mV AMS285-1.2CN AMS285-1.2CS AMS285-1.2CL
±4mV AMS385-1.2AN AMS385-1.2AS AMS385-1.2AL
±12mV AMS385-1.2BN AMS385-1.2BS AMS385-1.2BL
±25mV AMS385-1.2CN AMS385-1.2CS AMS385-1.2CL
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
AMS285-1.2/AMS385-1.2
ABSOLUTE MAXIMUM RATINGS
Reverse Current 30mA Storage temperature
Forward Current 10mA Soldering information
Operating Temperature Range TO-92 package: 10 sec.
AMS285-1.2
AMS385-1.2
-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-1.2
Min Typ Max
1.231 1.235 1.239 1.223 1.235 1.247 1.205 1.235 1.260 V
0.2 0.60 1 1
1.0
10
8 10
20
60 60 60
25 50 100 150
20 20 20 ppm
AMS285B-1.2
Min Typ Max
8 10
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-1.2
Min Typ Max
1.231 1.235 1.239 1.223 1.235 1.247 1.205 1.235 1.260 V
0.2 0.60 1 1
1.0
10
AMS385B-1.2
Min Typ Max
1.0
20
1.0
10
20
AMS285C-1.2
Min Typ Max
1.0
20
8 15
25
AMS385C-1.2
Min Typ Max
1.0
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
8 10
20
60 60 60
25 50 100 150
20 20 20 ppm
8 10
20
8 15
25
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
µA
µA
µV
ppm/°C
AMS285-1.2/AMS385-1.2
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
Thermal Resistance TO-92 SO-8 SOT-89
ϕ
(junction to ambient)
JA
170°C/W (0.125” leads) 165°C/W 160°C/W
max is:
j
Note 3: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at T
= 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, 85°C.
MIN
PIN CONNECTIONS
TO-92 8L SOIC SOT-89
Plastic Package (N) SO Package (S) (L)
N/C N/CN/C
+
123
8437 56
1 2
N/C N/C N/C
123
-
N/C
-+
Bottom View Top View Top View
TYPICAL APPLICATIONS
MAX and
Wide Input Micropower Reference Reference from
Range Reference from 9V Battery 1.5V Battery
VIN = 2.3V TO 30V
LM334
AMS385-1.2
4.3k
OUT
1.24V
9V
500k
1.2V
AMS385-1.2
1.5V
3k
1.2V
AMS385-1.2
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
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