LT1025C データシートの表示（PDF） - Linear Technology

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LT1025C

Micropower Thermocouple Cold Junction Compensator

Linear Technology 

LT1025

APPLICATIO S I FOR ATIO

3. Calibrate output by adding in a true offset term which

does not affect gain (by summing, etc.). Calibration may

be done at any temperature either by immersing the

thermocouple in a calibrated bath or by substituting a

precision input voltage. The method which tends to

minimize worst-case error over the whole TL to TH range

is to calibrate at 1/6 or 5/6 of span. This may be modified

if best accuracy is desired at one particular point.

Breakpoint correction for nonlinearity is more compli-

cated than a simple offset, but a single breakpoint com-

bined with offset will reduce errors typically by 4:1 over a

simple offset technique.

TYPICAL APPLICATIO S

Eliminating Amplifier Feedback Resistors

(Output Goes Negative with Increasing Temperature)

15V

VIN

3k

+–

C2

1µF

TYPE K

C1

0.1µF

15V

2– 7

LTKA0x††

3+

4

–15V

LT1025

K

GND

R–VO

300k

–15V

6

VOUT

–10mV/°C

†† OR EQUIVALENT. SEE “AMPLIFIER CONSIDERATIONS”

Type K Thermometer with Grounded Thermocouple

R3

R2

255k

100Ω

1%

R1

1k

1%

R5

10k

C2

1µF

TYPE K

R6

9.1k 0.1µF

V+

–

LTKA0x††

+

V–

V+

VIN VO

LT1025

GND R–

VOUT

10mV/°C

R4*

470k

V–

–15V

*R4 ≤ V– IF OUTPUT MUST SINK CURRENT, R4

30µA

MUST BE DECREASED APPROPRIATELY. R4 IS NOT

REQUIRED (OPEN) FOR LT1025 TEMPERATURES ≥ 0°C

WHEN SOURCING CURRENT ONLY

†† OR EQUIVALENT. SEE “AMPLIFIER CONSIDERATIONS”

1025fb

7

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