LT1025 查看數據表（PDF） - Linear Technology

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LT1025

Micropower Thermocouple Cold Junction Compensator

Linear Technology 

LT1025

TYPICAL APPLICATIO S

Differential Thermocouple Amplifier

–

TYPE K†

VCM

C1*

R1

10k

0.1%

R3

1M

0.1%

V+

–

+ R2

10k

0.1% R4

1M

5V** 0.1%

LTKA0x††

+

V–

C2*

VIN

VO

LT1025

GND

R5

3k

10mV/°C

R9

(V–)(10k)

=

100k VOUT (MAX)

V–

–15V

VOUT

R6

10mV/°C

7.5k

1%

R7

500

FULL-SCALE

TRIM

R8

5k

1%

*C1 AND C2 FILTER RIPPLE AND NOISE, BUT WILL LIMIT AC COMMON-MODE REJECTION

IF NOT MATCHED. SUGGESTED VALUES ARE 0.001µF TO 0.1µF

**USE LOWEST POSSIBLE SUPPLY VOLTAGE TO MINIMIZE INTERNAL TEMPERATURE RISE

† FOR BEST ACCURACY, THERMOCOUPLE RESISTANCE SHOULD BE LESS THAN 100Ω

†† OR EQUIVALENT. SEE “AMPLIFIER CONSIDERATIONS”

8

Utilizing Negative LT1025 Drive to Accommodate Grounded Thermocouple*

15V

R7

15k

VIN

6V

LT1025 VO

GND

–10mV/°C

R4

R5

141k

47k

–15V R6

10k

–+

1µF

TYPE E

15V

–

LTKA0x††

+

–15V

R1

1k

1%

C1

0.1µF

R2

100Ω

R3

141k

1% VOUT

10mV/°C

0°C TO 500°C

*SEE “REVERSING THE POLARITY OF THE 10mV/°C OUTPUT”

†† OR EQUIVALENT. SEE “AMPLIFIER CONSIDERATIONS”

1025fb

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