Advanced Monolithic Systems, Inc.

6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

AMS1004-1.2

PIN CONNECTIONS

TO-92

SO-8

SOT-89

Plastic Package (N)

SO Package (S)

(L)

1

2

3

1

2

8

4

3

7

5

6

N/C

N/C

N/C

N/C N/C

N/C

+

-

N/C

-

+

1

2

3

Bottom View

Top View

Top View

TYPICAL APPLICATIONS

Wide Input

Micropower Reference

Reference from

Range Reference

from 9V Battery

1.5V Battery

4.3k

LM334

OUT

1.24V

AMS1004-1.2

V

AMS1004-1.2

1.2V

500k

9V

AMS1004-1.2

1.2V

3k

1.5V

Micropower Thermocouple Cold Junction Compensator

+

LM334

AMS1004-1.2

R1

R2

ZERO ADJ

100k

1M

1%

5.1k

2k

1%

TC ADJ

500

METER

MERCURY

CELL

1.345V

+

-

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)

(

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

Ω

12.17

11.17

S

6.4

63.4

150

Ω

1.908

1.766

Typical supply current 50

µA