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Linear Technology Electronic Components Datasheet

LT1025 Datasheet

Micropower Thermocouple Cold Junction Compensator

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LT1025
Micropower Thermocouple
Cold Junction Compensator
FEATURES
s 80µA Supply Current
s 4V to 36V Operation
s 0.5°C Initial Accuracy (A Version)
s Compatible with Standard Thermocouples
(E, J, K, R, S, T)
s Auxiliary 10mV/°C Output
s Available in 8-Lead PDIP and SO Packages
U
APPLICATIO S
s Thermocouple Cold Junction Compensator
s Centigrade Thermometer
s Temperature Compensation Network
DESCRIPTIO
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.
The LT1025 will operate with a supply voltage from 4V to 36V.
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.
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.
BLOCK DIAGRA
BOW*
CORRECTION
VOLTAGE
E 60.9µV/°C
VIN
+
BUFFER
J 51.7µV/°C
K,T 40.6µV/°C
R, S 6µV/°C
10mV/°C
TEMPERATURE
SENSOR
R– COMMON
V0 10mV/°C
*CORRECTS FOR BOW
GND
IN COLD JUNCTION, NOT
IN PROBE (HOT JUNCTION)
LT1025 • BD01
TYPICAL APPLICATIO
Type K 10mV/°C Thermometer
R2
100
FULL-SCALE TRIM
R3**
255k
1%
V+
VIN K
LT1025
GND RVO
R1
1k
1%
–+
TYPE K
R4*
V
V+
LTKA0x††
+
C2
0.1µF
VOUT
10mV/°C
V
*R4
V
30µA
,
R4
IS
NOT
REQUIRED
C1 (OPEN) FOR LT1025 TEMPERATURES 0°C
0.1µF **SELECTED FOR 0°C TO 100°C RANGE
†† OR EQUIVALENT. SEE
“AMPLIFIER CONSIDERATIONS”
LT1025 • TA01
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Linear Technology Electronic Components Datasheet

LT1025 Datasheet

Micropower Thermocouple Cold Junction Compensator

No Preview Available !

LT1025
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage .......................................... 36V
Output Voltage (Forced)........................................ 5V
Output Short-Circuit Duration ..................... Indefinite
Operating Temperature Range
LT1025AC, LT1025C ............................0°C to 70°C
LT1025AM, LT1025M .................. – 55°C to 125°C
Storage Temperature Range ............ – 55°C to 150°C
UW U
PACKAGE/ORDER I FOR ATIO
E
60.9µV/°C
VIN
VO
10mV/°C
GND
1
2
3
4
TOP VIEW
8
J
51.7µV/°C
7
K, T
40.6µV/°C
6
5
R, S
6RµV/°C
COMMON
ORDER PART
NUMBER
LT1025ACN8
LT1025CN8
LT1025CS8
N8 PACKAGE
S8 PACKAGE
8-LEAD PDIP 8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 130°C/W (N8)
TJMAX = 150°C, θJA = 190°C/W (S8)
S8 PART MARKING
1025
J8 PACKAGE 8-LEAD CERDIP
TJMAX = 150°C, θJA = 100°C/W
LT1025AMJ8
LT1025MJ8
OBSOLETE PACKAGE
Consider the N8 Package for Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specificatons are at TA = 25°C. VS = 5V, Pin 5 tied to Pin 4, unless otherwise noted.
PARAMETER
Temperature Error at
10mV/°C Output (Notes 4, 5)
Resistor Divider Accuracy
(Notes 2, 4)
Supply Current
Line Regulation (Note 3)
Load Regulation (Note 3)
Divider Impedance
Change in Supply Current
CONDITIONS
TJ = 25°C
LT1025A
LT1025
Full Temperature Span
VOUT = 10mV/°C
LT1025A
E
J
K, T
R, S
LT1025
E
J
K, T
R, S
4V VIN 36V
LT1025AC, LT1025C
LT1025AM, LT1025M
4V VIN 36V
0 IO 1mA
E
J
K, T
R, S
4V VIN 36V
MIN TYP MAX UNITS
0.3 0.5
0.5 2.0
°C
°C
q See Curve
60.6
51.4
40.3
5.8
60.4
51.2
40.2
5.75
50
q 50
q
q
q
60.9
51.7
40.6
5.95
60.9
51.7
40.6
5.95
80
0.003
0.04
2.5
2.1
4.4
3.8
0.01
61.3 µV/°C
52.1 µV/°C
41.0 µV/°C
6.2 µV/°C
61.6 µV/°C
52.3 µV/°C
41.2 µV/°C
6.3 µV/°C
100 µA
150 µA
200 µA
0.02 °C/V
0.2 °C
k
k
k
k
0.05 µA/V
Note 1: Absolute Maximum Ratings are those values beyond which the
life of a device may be impaired.
Note 2: Divider accuracy is measured by applying a 10.000V signal to the
output divider and measuring the individual outputs.
Note 3: Regulation does not include the effects of self-heating. See
“Internal Temperature Rise” in Application Guide. Load regulation is
30µA IO 1mA for TA 0°C.
Note 4: To calculate total temperature error at individual thermocouple
outputs, add 10mV/°C output error to the resistor divider error. Total error
for type K output at 25°C with an LT1025A is 0.5°C plus (0.4µV/°C)(25°C)/
(40.6µV/°C) = 0.5°C + 0.25°C = 0.75°C.
Note 5: Temperature error is defined as the deviation from the following
formula: VOUT = 10mV(T) + (10mV)(5.5 • 10-4)(T – 25°C)2. The second
term is a built-in nonlinearity designed to help compensate the nonlinearity
of the cold junction. This “bow” is 0.34°C for a 25°C temperature change.
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2


Part Number LT1025
Description Micropower Thermocouple Cold Junction Compensator
Maker Linear Technology
Total Page 12 Pages
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