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| 型號： | LT1025ACN8 |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC THERMO COMPNSATR MICRPWR 8DIP |
| 標準包裝： | 50 |
| 類型： | 熱電偶調(diào)節(jié)器 |
| 輸入類型： | 電壓 |
| 輸出類型： | 電壓 |
| 電流 - 電源： | 150µA |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 8-DIP（0.300"，7.62mm） |
| 供應商設備封裝： | 8-PDIP |
| 包裝： | 管件 |
3
LT1025
1025fb
TYPICAL PERFOR A CE CHARACTERISTICS
UW
10mV/
°C Output Temperature
Error LT1025
10mV/
°C Output Temperature
Error LT1025A
Supply Current
TEMPERATURE
TO BE MEASURED
T1
T2
Fe
Cu
CONSTANTAN
LT1025 MUST BE LOCATED
NEXT TO COLD JUNCTION
FOR TEMPERATURE TRACKING
VS
}
LT1025 AG01
JUNCTION TEMPERATURE (
°C)
*ERROR CURVE FACTORS IN THE NONLINEARITY
TERM BUILT IN TO THE LT1025. SEE THEORY OF
OPERATION IN APPLICATION GUIDE SECTION
–50
–10
TEMPERATURE
ERROR
(
°C)
–8
–4
–2
0
10
4
0
50
75
LT1025 G01
–6
6
8
2
–25
25
100
125
GUARANTEED LIMITS*
LT1025
JUNCTION TEMPERATURE (
°C)
*ERROR CURVE FACTORS IN THE NONLINEARITY
TERM BUILT IN TO THE LT1025. SEE THEORY OF
OPERATION IN APPLICATION GUIDE SECTION
–50
–5
TEMPERATURE
ERROR
(
°C)
–4
–2
–1
0
5
2
0
50
75
LT1025 G02
–3
3
4
1
–25
25
100
125
GUARANTEED LIMITS*
LT1025A
SUPPLY VOLTAGE (V)
0
CURRENT
(
A)
20
60
80
100
200
140
10
20
25
LT1025 G03
40
160
180
120
515
30
35
40
DOES NOT INCLUDE 30
A
PULL-DOWN CURRENT
REQUIRED FOR TEMPERATURES
BELOW 0
°C
TJ = 125°C
PIN 4 TIED TO PIN 5
TJ = 25°C
TJ = –55°C
The LT1025 was designed to be extremely easy to use, but
the following ideas and suggestions should be helpful in
obtaining the best possible performance and versatility
from this new cold junction compensator.
Theory of Operation
A thermocouple consists of two dissimilar metals joined
together. A voltage (Seebeck EMF) will be generated if the
two ends of the thermocouple are at different
temperatures. In Figure 1, iron and constantan are joined
at the temperature measuring point T1. Two additional
thermocouple junctions are formed where the iron and
constantan connect to ordinary copper wire. For the
purposes of this discussion it is assumed that these two
junctions are at the same temperature, T2. The Seebeck
voltage, VS, is the product of the Seebeck coefficient α,
and the temperature difference, T1 – T2; VS = α (T1 – T2).
The junctions at T2 are commonly called the cold junction
because a common practice is to immerse the T2 junction
in 0
°C ice/water slurry to make T2 independent of room
temperature variations. Thermocouple tables are based
on a cold-junction temperature of 0
°C.
To date, IC manufacturers efforts to make microminiature
thermos bottles have not been totally successful. There-
fore, an electronically simulated cold-junction is required
for most applications. The idea is basically to add a
temperature dependent voltage to VS such that the voltage
sum is the same as if the T2 junction were at a constant 0
°C
instead of at room temperature. This voltage source is
called a cold junction compensator. Its output is designed
to be 0V at 0
°C and have a slope equal to the Seebeck
coefficient over the expected range of T2 temperatures.
Figure 1
To operate properly, a cold junction compensator must be
at exactly the same temperature as the cold junction of the
thermocouple (T2).
Therefore, it is important to locate the
LT1025 physically close to the cold junction with local
temperature gradients minimized. If this is not possible,
APPLICATIO S I FOR ATIO
WU
UU
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