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AMS9491AN

1.235V VOLTAGE REFERENCE

Advanced Monolithic Systems Inc 

TYPICAL APPLICATIONS (Continued)

Centigrade Thermometer

1.5V†

V+

R

LM334

V-

V1 V2

OUTPUT

2.3k 1mV/° C

2.2k

90k 25k

27k AMS9491

1.2k

R1

1k

Calibration

1. Adjust R1 so that V1 = temp at 1mV/°K.

2. Adjust V2 to 273.2mV.

† IQ for 1.3V to 1.6V battery voltage = 50µA to 150µA

AMS9491

Micropower* 10V Reference

IQ

VIN = 15V

1M

2+

7

LM4250C 6

3-

4

8

22M

10V

150pF 3.5M

AMS9491

500k

*IQ ≅ 20µA standby current

Micropower Thermocouple Cold Junction Compensator

V+

LM334

5.1k

1M

1%

MERCURY

CELL

+

1.345V

V-

ZERO ADJ

100k

AMS9491

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

408 953Ω 12.17

11.17

S

6.4

63.4 150Ω 1.908

1.766

Typical supply current 50µA

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

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