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LT1025_03

更新时间： 2024-11-23 04:43:59
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
12页 193K
描述
Micropower Thermocouple Cold Junction Compensator

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中文翻译

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LT1025_03 数据手册

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LT1025  
Micropower Thermocouple  
Cold Junction Compensator  
U
FEATURES  
DESCRIPTIO  
80µA Supply Current  
The LT®1025 is a micropower thermocouple cold junction  
compensator for use with type E, J, K, R, S, and T  
thermocouples. It utilizes wafer level and post-package  
trimming to achieve 0.5°C initial accuracy. Special curvature  
correction circuitry is used to match the “bow” found in all  
thermocouples so that accurate cold junction compensation  
is maintained over a wider temperature range.  
■
■
4V to 36V Operation  
■
0.5°C Initial Accuracy (A Version)  
Compatible with Standard Thermocouples  
(E, J, K, R, S, T)  
Auxiliary 10mV/°C Output  
Available in 8-Lead PDIP and SO Packages  
■
■
■
TheLT1025willoperatewithasupplyvoltagefrom4Vto36V.  
Typical supply current is 80µA, resulting in less than 0.1°C  
internal temperature rise for supply voltages under 10V.  
A 10mV/°C output is available at low impedance, in addition  
to the direct thermocouple voltages of 60.9µV/°C (E),  
51.7µV/°C (J), 40.3µV/°C (K, T) and 5.95µV/°C (R, S). All  
outputs are essentially independent of power supply voltage.  
U
APPLICATIO S  
■
Thermocouple Cold Junction Compensator  
■
Centigrade Thermometer  
■
Temperature Compensation Network  
A special kit is available (LTK001) which contains an LT1025  
and a custom tailored thermocouple amplifier. The amplifier  
and compensator are matched to allow a much tighter specifi-  
cation of temperature error than would be obtained by adding  
the compensator and amplifier errors on a worst-case basis.  
The amplifier from this kit is available separately as LTKA0x.  
The LT1025 is available in either an 8-pin PDIP or 8-pin SO  
package for temperatures between 0°C and 70°C.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
W
U
BLOCK DIAGRA  
TYPICAL APPLICATIO  
Type K 10mV/°C Thermometer  
E 60.9µV/°C  
R2  
100Ω  
FULL-SCALE TRIM  
R3**  
255k  
1%  
V
IN  
J 51.7µV/°C  
+
R1  
1k  
1%  
BUFFER  
K,T 40.6µV/°C  
R, S 6µV/°C  
BOW*  
CORRECTION  
VOLTAGE  
+
V
–
+
C2  
V
–
0.1µF  
V
OUT  
10mV/°C  
LTKA0x††  
V
10mV/°C  
TEMPERATURE  
SENSOR  
IN  
LT1025  
–
K
+
–
+
–
V
–
R
COMMON  
*R4 ≤  
, R4 IS NOT REQUIRED  
–
30µA  
V
(OPEN) FOR LT1025 TEMPERATURES ≥ 0°C  
TYPE K  
R4*  
V
10mV/°C  
V
O
0
C1  
0.1µF  
GND  
R
**SELECTED FOR 0°C TO 100°C RANGE  
†† OR EQUIVALENT. SEE  
“AMPLIFIER CONSIDERATIONS”  
GND  
*CORRECTS FOR BOW  
IN COLD JUNCTION, NOT  
IN PROBE (HOT JUNCTION)  
–
LT1025 • BD01  
V
LT1025 • TA01  
1025fb  
1
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