AMS3100-2.5 查看數據表（PDF） - Advanced Monolithic Systems Inc

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AMS3100-2.5

MICROPOWER VOLTAGE REFERENCE

Advanced Monolithic Systems Inc 

TYPICAL APPLICATIONS (Continued)

AMS3100-2.5

Micropower Thermocouple Cold Junction Compensator

V+

LM334

18k

1M

1%

V-

3V +

LITHIUM

ZERO

AMS3100-2.5 ADJ 100k

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

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

AMS3100-2.5

AMS3100-2.5

30V

C1

150pF

R1

68k

IOUT*

-1.5V TO -27V

2-

7

LM312

6

3+

4

R2

-30V

*IOUT =2.5V/R2

1.5V TO 27V

R1

68k

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

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