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AMS285-25 데이터시트(HTML) 5 Page - Advanced Monolithic Systems

부품명 AMS285-25
상세내용  MICROPOWER VOLTAGE REFERENCE DIODE
Download  8 Pages
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제조사  ADMOS [Advanced Monolithic Systems]
홈페이지  http://www.advanced-monolithic.com
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AMS285-25 데이터시트(HTML) 5 Page - Advanced Monolithic Systems

   
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Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS285-2.5/AMS385-2.5
TYPICAL APPLICATIONS (Continued)
Micropower Thermocouple Cold Junction Compensator
+
LM334
AMS385-2.5
R1
R2
ZERO ADJ
100k
1M
1%
18k
2k
1%
TC ADJ
500
METER
3V
LITHIUM
+
-
V+
V-
R
THERMOCOUPLE
+
-
COLD JUNCTION
ISO THERMAL
WITH LM334
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
Seebeck
R1
R2
Voltage
Voltage
Type
Coefficient
(
Ω)
(
Ω) Across R1
Across R2
(mV/
°°C)
@ 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
953
12.17
11.17
S
6.4
63.4
150
1.908
1.766
Typical supply current 50
µA
Precision 1
µµA to 1mA Current Sources
7
4
3
2
+
-
LM312
6
AMS385-2.5
R2
R1
68k
-30V
-1.5V TO -27V
C1
150pF
I
OUT*
*IOUT =2.5V/R2
7
4
3
2
+
-
LM312
6
R2
R1
68k
30V
1.5V TO 27V
C1
150pF
I
OUT*
AMS385-2.5


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