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PDF AMS385-25AS Data sheet ( Hoja de datos )
| Número de pieza | AMS385-25AS | |
| Descripción | MICROPOWER VOLTAGE REFERENCE DIODE | |
| Fabricantes | Advanced Monolithic Systems | |
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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
1 page  
TYPICAL APPLICATIONS (Continued)
AMS285-2.5/AMS385-2.5
Micropower Thermocouple Cold Junction Compensator
V+ LM334
18k
1M
1%
3V +
LITHIUM
ZERO ADJ
100k
AMS385-2.5
R2
V-
R1
2k
R 1%
TC ADJ
500
+
THERMOCOUPLE
-
COLD JUNCTION
ISO THERMAL
WITH LM334
+
METER
-
Adjustment Procedure
1. Adjust TC ADJ pot until voltage across R1 equals Kelvin temperature
multiplied by the thermocouple Seebeck coefficient.
2. Adjust ZERO ADJ pot until voltage across R2 equals the thermocouple
Seebeck coefficient multiplied by 273.2.
Thermocouple
Type
Seebeck
Coefficient
(mV/ °C)
R1 R2 Voltage
Voltage
(Ω) (Ω) Across R1 Across R2
@ 25°C (mV) (mV)
J
52.3
523 1.24k 15.60
14.32
T
42.8
432 1k 12.77
11.78
K
40.8
412 953Ω 12.17
11.17
S 6.4 63.4 150Ω 1.908 1.766
Typical supply current 50µA
Precision 1µA to 1mA Current Sources
AMS385-2.5
AMS385-2.5
30V
R1
68k
IOUT*
-1.5V TO -27V
C1
150pF
2- 7
LM312
3+ 4
6
R2
-30V
*IOUT =2.5V/R2
R1
68k
1.5V TO 27V
IOUT*
2- 7
LM312
3+ 4
C1
150pF
6
R2
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AMS385-25AS.PDF ] | |
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