AMS285-25AS Просмотр технического описания (PDF) - Advanced Monolithic Systems Inc

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AMS285-25AS

MICROPOWER VOLTAGE REFERENCE DIODE

Advanced Monolithic Systems Inc 

TYPICAL APPLICATIONS (Continued)

AMS285-2.5/AMS385-2.5

Micropower Thermocouple Cold Junction Compensator

V+

LM334

18k

1M

1%

3V +

LITHIUM

V-

ZERO ADJ

100k

AMS385-2.5

R2

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

6

3+

4

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

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