AMS3100A-1.2 データシートの表示（PDF） - Advanced Monolithic Systems Inc

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AMS3100A-1.2

MICROPOWER VOLTAGE REFERENCE

Advanced Monolithic Systems Inc 

TYPICAL APPLICATIONS (Continued)

AMS3100-1.2

Micropower Thermocouple Cold Junction Compensator

V+

LM334

5.1k

1M

1%

V-

MERCURY

CELL

+

1.345V

ZERO

ADJ 100k

AMS3100-1.2

2k

R 1%

TC ADJ

500

R2

R1

+

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

408 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

AMS3100-1.2

AMS3100-1.2

30V

C1

150pF

R1

100k

IOUT*

-1.5V TO -27V

2-

7

LM312

6

3+

4

R2

-30V

*IOUT =1.23V/R2

1.5V TO 27V

R1

100k

IOUT*

2-

7

LM312

3+

4

C1

150pF

6

R2

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723

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