LT1025CN8 Linear Technology, LT1025CN8 Datasheet

IC THERMO COMPNSATR MICRPWR 8DIP

LT1025CN8

Manufacturer Part Number
LT1025CN8
Description
IC THERMO COMPNSATR MICRPWR 8DIP
Manufacturer
Linear Technology
Type
Thermocouple Conditionerr
Datasheet

Specifications of LT1025CN8

Input Type
Voltage
Output Type
Voltage
Current - Supply
150µA
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Interface
-

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Price
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BLOCK DIAGRA
FEATURES
APPLICATIO S
Thermocouple Cold Junction Compensator
Centigrade Thermometer
Temperature Compensation Network
80 A Supply Current
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
*CORRECTS FOR BOW
IN COLD JUNCTION, NOT
IN PROBE (HOT JUNCTION)
TEMPERATURE
CORRECTION
VOLTAGE
10mV/ C
SENSOR
BOW*
U
+
– –
BUFFER
GND
V
W
IN
E 60.9 V/ C
V
0
10mV/ C
R – COMMON
J 51.7 V/ C
K,T 40.6 V/ C
R, S 6 V/ C
LT1025 • BD01
Cold Junction Compensator
Micropower Thermocouple
DESCRIPTIO
TYPICAL APPLICATIO
The LT
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 80 A, 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 60.9 V/ C (E),
51.7 V/ C (J), 40.3 V/ C (K, T) and 5.95 V/ 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.
GND R
, LTC and LT are registered trademarks of Linear Technology Corporation.
LT1025
V
V
IN
+
®
1025 is a micropower thermocouple cold junction
V
K
O
V
Type K 10mV/ C Thermometer
1%
R4*
R1
1k
TYPE K
FULL-SCALE TRIM
+
100
U
R2
C1
0.1 F
LTKA0x
+
V
V
+
††
*R4
(OPEN) FOR LT1025 TEMPERATURES 0 C
**SELECTED FOR 0 C TO 100 C RANGE
††
“AMPLIFIER CONSIDERATIONS”
OR EQUIVALENT. SEE
U
30 A
V
R3**
0.1 F
255k
1%
C2
, R4 IS NOT REQUIRED
LT1025
V
10mV/ C
OUT
LT1025 • TA01
1025fb
1

Related parts for LT1025CN8

LT1025CN8 Summary of contents

Page 1

... 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 LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO J 51 K,T 40 ...

Page 2

... This “bow” is 0.34 C for temperature change ORDER PART TOP VIEW J NUMBER LT1025ACN8 40 LT1025CN8 – LT1025CS8 COMMON S8 PACKAGE S8 PART MARKING 8-LEAD PLASTIC SO = 150 C, = 130 C/W (N8) JA 1025 = 150 C, = 190 C/W (S8) JA LT1025AMJ8 ...

Page 3

W U TYPICAL PERFOR A CE CHARACTERISTICS 10mV/ C Output Temperature Error LT1025 10 8 GUARANTEED LIMITS* 6 LT1025 –2 –4 –6 –8 –10 – 100 125 –25 JUNCTION TEMPERATURE ( C) LT1025 ...

Page 4

LT1025 U U APPLICATIO S I FOR ATIO an extender made of matching thermocouple wire can be used. This shifts the cold junction from the user termina- tion to the end of the extender so that the LT1025 can be ...

Page 5

U U APPLICATIO S I FOR ATIO same temperature, but temperature gradients exist within IC packages and across PC boards whenever power is dissipated. For this reason, extreme care must be used to ensure that no temperature gradients exist in ...

Page 6

LT1025 U U APPLICATIO S I FOR ATIO In many situations, thermocouples are used in high noise environments, and some sort of input filter is required. (See discussion of input filters). To reject 60Hz pick-up with reasonable capacitor values, input ...

Page 7

U U 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 ...

Page 8

LT1025 U TYPICAL APPLICATIO S TYPE K *C1 AND C2 FILTER RIPPLE AND NOISE, BUT WILL LIMIT AC COMMON-MODE REJECTION IF NOT MATCHED. SUGGESTED VALUES ARE 0.001 F TO 0.1 F **USE LOWEST POSSIBLE SUPPLY VOLTAGE TO MINIMIZE INTERNAL TEMPERATURE ...

Page 9

U TYPICAL APPLICATIO S Type S Thermocouple Amplifier with Ultralow Offset and Drift + R,S LT1025 V O – GND R * TRIM R5 FOR V ** TRIM R2 FOR V † THIS AMPLIFIER HAS A DELIBERATE ...

Page 10

LT1025 PACKAGE DESCRIPTIO CORNER LEADS OPTION .045 – .068 (1.143 – 1.650) FULL LEAD OPTION .300 BSC (7.62 BSC) .008 – .018 (0.203 – 0.457) NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS Package ...

Page 11

... MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 12

... SELECTED FOR 200 C RANGE †† OR EQUIVALENT. SEE “AMPLIFIER CONSIDERATIONS” COMMENTS 120 V Max Max Max V OS www.linear.com FULL-SCALE ADJUST V OUT 10mV/ C LT1025 • TA07 , 280pA Max I OS 1V/ V Max VOL LT/TP 1103 1K REV B • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1988 1025fb ...

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