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LT1025ACJ8

Micropower Thermocouple Cold Junction Compensator

Linear Technology 

TYPICAL APPLICATIO S

Type S Thermocouple Amplifier with Ultralow Offset and Drift †

R2**

100Ω

R3

FULL-SCALE

909k

TRIM

1%

V+

VIN

R,S – +

LT1025

GND

R– VO

TYPE S

R7

750k

R1

1k

1%

1µF

R6

12k

R4

1.37M

1%

R4

2.7k

0.1µF

15V

2– 7

5

V+

LT1052

3+

V–

4

1

0.1µF

R5*

10k

OFFSET

TRIM

–15V

LT1009

2.5V

6

VOUT

10mV/°C

8

800°C TO 1200°C

0.1µF

LT1025 • TA06

* TRIM R5 FOR VOUT = 1.669V AT VIN = 0.000mV (+INPUT OF AMPLIFIER GROUNDED)

** TRIM R2 FOR VOUT = 9.998V AT T = 1000°C, OR FOR VIN AT +INPUT OF AMPLIFIER = 9.585mV

† THIS AMPLIFIER HAS A DELIBERATE OFFSET TO ALLOW OUTPUT SLOPE (10mV/°C) TO BE SET

INDEPENDENTLY FROM AN ARBITRARY HIGH TEMPERATURE CENTER POINT (1000°C). THIS IS

REQUIRED BECAUSE THE SLOPE OF TYPE “S” THERMOCOUPLES VARIES RAPIDLY WITH

TEMPERATURE, INCREASING FROM 6µV/°C AT 25°C to 11µV/°C AT 1000°C. NONLINEARITY LIMITS

ACCURACY TO ≈3°C OVER THE 800°C TO 1200°C RANGE EVEN WITH OFFSET CORRECTION

LT1025

1025fa

9

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