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LTK001 Thermocouple Cold Junction Compensator and Matched Amplifier
FEATURES

0.75C Initial Accuracy (A Version) Extremely Low Warmup Drift Preset Outputs for Type E, J, K, R, S, T Single 5V to 20V Operation 480A Typical Supply Current Available in 8-Pin DIP Package
thermocouple applications. It has low supply current to minimize warmup drift, very low offset voltage (<35V), high gain, and extremely low input bias currents (<600pA) to allow high impedance input filters to be used without degrading offset voltage or drift. Matching of the kits is accomplished by separating the compensators and amplifiers according to the polarity of their initial (room temperature) errors. This eliminates the need to sum the errors of the two components to find the worst-case error. The LTK001 has direct thermocouple outputs of 60.9V/C (E), 51.7V/C (J), 40.6V/C (K, T), and 5.95V/C (R, S). It also has a 10mV/C output which can be scaled to match any arbitrary thermocouple. For multiple thermocouple applications using one compensator, amplifiers may be ordered separately (LTKA0x), still matched to the compensator.
, LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. For typical performance curves and applications circuits consult the LT1025 data sheet.
APPLICATIO S
Thermocouple Cold Junction Compensation
DESCRIPTIO
The LTK001 is a thermocouple amplifier supplied with a matched cold junction compensator. By separating the amplifier and compensator functions, the problem of compensator temperature rise is virtually eliminated. The compensator is a selected version of the LT(R)1025 cold junction compensator. The amplifier, which is also available separately as LTKA0x has been specially selected for
TYPICAL APPLICATIO
V+
VIN LT1025
GND
U
U
R2 100 FULL-SCALE TRIM R1 1k 1%
U
Type K 10mV/C Thermometer
R3** 255k 1% C2 0.1F V+
-
LTKA0x K - * + C1 0.1F
+
V-
VOUT 10mV/C
V0 R-
TYPE K R4* - *R4 V , R4 IS NOT REQUIRED (OPEN) FOR 30A LT1025 TEMPERATURES 0C. **SELECTED FOR 0C-100C RANGE LTK001 TA01
V-
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LTK001
ABSOLUTE
AXI U
RATI GS
Amplifier (LTKA0x) Supply Voltage (Total V + to V -) ............................... 40V Differential Input Current (Note 2) ...................... 10mA Common Mode Input Voltage ............. Equal to Supplies Output Short-Circuit Duration .......................... Indefinite Compensator (LT1025) Supply Voltage (VIN to Ground Pin) ......................... 36V Output Voltage (Forced) ............................................ 5V Output Short-Circuit Duration .......................... Indefinite
PACKAGE/ORDER I FOR ATIO
TOP VIEW E 60.9V/C 1 VIN 2 VO 10mV/C 3 GND 4 N8 PACKAGE 8-LEAD PDIP COMPENSATOR (LT1025) TJMAX = 100C, JA = 130C/W (N8) 8 7 6 5 J 51.7V/C K,T 40.6V/C R,S 6V/C R- COMMON
VOS TRIM 1 -IN 2 +IN 3 V- 4
N8 PACKAGE 8-LEAD PDIP AMPLIFIER (LTKA0x) TJMAX = 100C, JA = 130C/W
ORDER PART NUMBER KIT LTK001CN8 LTK001ACN8
J8 PACKAGE 8-LEAD CERDIP COMPENSATOR (LT1025) TJMAX = 150C, JA = 100C/W (J8)
ORDER PART NUMBER AMPLIFIER ONLY (Note A) LTKA00CN8 LTKA01CN8
LTK001MJ8 LTK001AMJ8
OBSOLETE PACKAGE
Consider the N8 Package for Alternate Source
Note A: The polarity of the amplifier is indicated by the 0 or 1 in the part number. An LT1025 with a 0 identifier is properly matched with an LTKA00, while an LT1025 with a 1 identifier should be used with an LTKA01. Consult factory for parts specified with wider operating temperature ranges.
2
U
U
W
WW U
W
(Note 1)
Both Devices Operating Temperature Range LTK001AMJ8, LTK001MJ8 (OBSOLETE) ......................................................... - 55C to 125C LTK001ACN8, LTK001CN8 ...................... 0C to 70C Storage Temperature Range ................. - 65C to 150C Lead Temperature Range (Soldering, 10 sec.)...... 300C
TOP VIEW 8 7 6 5 VOS TRIM V+ OUT OVER COMP +IN 3 VOS TRIM 1 -IN 2
TOP VIEW VOS TRIM 8 - + 7 V+ 6 OUT 5 OVER COMP 4 V- H PACKAGE 8-LEAD TO-5 METAL CAN AMPLIFIER (LTKA0x) TJMAX = 150C, JA = 150C/W, JC = 45C/W
ORDER PART NUMBER AMPLIFIER ONLY (Note A) LTKA00MH LTKA01MH
OBSOLETE PACKAGE
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LTK001
ELECTRICAL CHARACTERISTICS (Matched Amplifier and Compensator)
TA = 25C, VS = 15V (Amplifier), VS = 5V (Compensator)
PARAMETER Total Temperature Error at 25C (Note 3) CONDITIONS Type E Type J Type K, T Type R, S Slope Error (Notes 4 and 9) 0C TJ 70C Type E Type J Type K, T Type R, S Total Temperature Error at Temperature Extremes (Note 9) 0C TJ 70C Type E Type J Type K, T Type R, S - 55C TJ 125C Type E Type J Type K, T Type R, S Temperature Error Change with Supply Voltage (Note 5) Supply Current 480 (Note 12) (Note 12) (Note 12) MIN LTK001A TYP MAX 0.75 0.75 0.86 5.0 0.05 0.06 0.07 0.28 2.0 2.1 2.6 16 6 6 6.3 30 0.1 900 480 MIN LTK001 TYP MAX 2.5 2.5 2.5 5.0 0.09 0.09 0.10 0.32 5 5 5.2 16 8.5 8.5 9 30 0.1 900 UNITS C C C C C/C C/C C/C C/C C C C C C C C C C/V A
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LTK001
ELECTRICAL CHARACTERISTICS (Compensator LT1025)
The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 5V unless otherwise noted.
PARAMETER Temperature Error at 10mV/C Output (Note 9) CONDITIONS TJ = 25C, LTK001A TJ = 25C, LTK001 Full Temperature Span Temperature Error at Individual Outputs (Note 10) LTK001A: E, J, K, T LTK001A: R, S LTK001: E, J, K, T LTK001: R, S Full Temperature Span Supply Current 4V VIN 36V 0C TJ 70C - 55C TJ 125C Change in Supply Current Line Regulation (Note 11) Load Regulation (Note 11) Divider Impedance 4V VIN 36V 4V VIN 36V 10mV/C Output 0 IO 1mA 10mV/C Output E J K, T R, S

COMPENSATOR (LT1025) MIN TYP MAX 0.3 0.5 0.4 0.4 0.8 1.2 80 0.5 2.0 0.75 1.5 2.4 3.5 100 150 200 0.01 0.003 0.04 2.5 2.1 4.4 3.8 0.05 0.02 0.2
UNITS C C C C C C A A A A/V C/V C k k k k
See Curve on LT1025 Data Sheet
See Curve on LT1025 Data Sheet
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LTK001
ELECTRICAL CHARACTERISTICS (Amplifier LTKA0x)
The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 15V, VCM = 0V, TJ = 25C unless otherwise noted.
PARAMETER Input Offset Voltage Input 0ffset Voltage Drift with Temperature Input Bias Current Input Bias Current Drift with Temperature lnput 0ffset Current lnput Offset Current Drift with Temperature Large Signal Voltage Gain Common Mode Rejection Ratio Power Supply Rejection Ratio Common Mode Input Voltage Range Output Voltage Swing (Notes 6, 8) Supply Current Supply Voltage Range Total V + to V - Voltage (Note 6) 0C TA 70C - 55C TA 125C (Note 6) 0C TA 70C - 55C TA 125C (Note 6) RL = 10k VCM = 13.5V 2.5V VS 20V (Note 5) Notes 6, 7 Referred to Supplies Above V- Below V + IOUT = 0.1mA IOUT = 1mA

CONDITIONS
AMPLIFIER (LTKA0x) MIN TYP MAX 10 0.3 200 300 1 100 200 0.6 400 106 106 0.75 1.0 0.8 1.1 400 4.5 800 40 2000 130 125 35 1.5 600 1500 5 500 700 4
UNITS V V/C pA pA pA/C pA pA pA/C V/mV dB dB V V V V A V
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The inputs of the LTKA0x amplifier are clamped with diodes, so a differential voltage rating does not apply. Note 3: Total temperature error is the overall error at 25C taking into account the offset of the amplifier, the offset at the compensator 10mV/C output, and the error in the compensator divider network. Warmup drift is not included. Note 4: Slope error is the increase in total temperature error as ambient temperature is increased. It is guaranteed by design and by other tests, but is not tested directly. Note 5: This is a worst-case limit assuming that any or all supply voltages change. Note 6: Guaranteed, but not tested. Note 7: By referring common mode range to the supplies, the range referred to ground can be quickly calculated for any given supply voltage. With a single 5V supply, for instance, which has a worst-case low value of 4.7V, the upper common mode limit is 4.7V - 1V = 3.7V. The lower common mode limit is 0V + 0.75V = 0.75V. With 15V supplies, the limits would be 14V and -14.25V, respectively. Common mode range has a temperature sensitivity of 2mV/C. Note 8: Absolute output voltage swing is calculated by subtracting the given limits from actual supply voltage. These limits indicate the point where offset voltage has changed suddenly by 5V.
Note 9: Temperature error is defined as the deviation from the following formula: VOUT = (T) + (T - 25C)2 = Typical thermocouple Seebeck coefficient as follows, E = 60.9V/C, J = 51.7V/C, K, T = 40.6V/C, R, S = 5.95V/C. = 10mV/C at the 10mV output. = Nonlinearity coefficient built into the LT1025 to help compensate for the nonlinearities of thermocouples. = 5.5 x 10 -4, generating 0.34C bow for 25C temperature change, and 1.36C bow for 50C change. Note 10: Temperature error at the individual outputs is the sum of the 10mV/C output error plus the resistor divider error. Note 11: Line and load regulation do not take into account the effects of self-heating. Output changes due to self-heating can be calculated as follows: VOUT (Line) = VIN(Iq + Iload)(150C/W) VOUT (Load) = (Iload)(VIN)(150C/W) = LT1025 supply current Load regulation is 30A IO 1mA for TA 0C. Note 12: Larger errors with type R and S thermocouples are due mostly to 35V offset of the amplifier. This error can be reduced to 5V max with the LTC(R)1050 or LTC1052 operational amplifiers.
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LTK001
PACKAGE DESCRIPTIO
SEATING PLANE .010 - .045* (0.254 - 1.143) .016 - .021** (0.406 - 0.533)
45 .028 - .034 (0.711 - 0.864)
*LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE AND THE SEATING PLANE .016 - .024 **FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS (0.406 - 0.610) H8(TO-5) 0.200 PCD 0204
6
U
H Package 8-Lead TO-5 Metal Can (.200 Inch PCD)
(Reference LTC DWG # 05-08-1320)
.335 - .370 (8.509 - 9.398) DIA .305 - .335 (7.747 - 8.509) .040 (1.016) MAX .050 (1.270) MAX GAUGE PLANE .165 - .185 (4.191 - 4.699) REFERENCE PLANE .500 - .750 (12.700 - 19.050) .027 - .045 (0.686 - 1.143) PIN 1 .200 (5.080) TYP .110 - .160 (2.794 - 4.064) INSULATING STANDOFF
OBSOLETE PACKAGE
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LTK001
PACKAGE DESCRIPTIO
CORNER LEADS OPTION (4 PLCS)
.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
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
J8 Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
.005 (0.127) MIN .405 (10.287) MAX 8 7 6 5 .023 - .045 (0.584 - 1.143) HALF LEAD OPTION .025 (0.635) RAD TYP 1 2 3 .220 - .310 (5.588 - 7.874) 4 .200 (5.080) MAX .015 - .060 (0.381 - 1.524) 0 - 15 .045 - .065 (1.143 - 1.651) .014 - .026 (0.360 - 0.660) .100 (2.54) BSC .125 3.175 MIN
J8 0801
OBSOLETE PACKAGE
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LTK001
PACKAGE DESCRIPTIO
.300 - .325 (7.620 - 8.255)
.008 - .015 (0.203 - 0.381) +.035 .325 -.015
(
8.255
+0.889 -0.381
)
INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
NOTE: 1. DIMENSIONS ARE
RELATED PARTS
PART NUMBER LT1012 LT1025 LTC1050 LTC2050 DESCRIPTION Picoamp Input Current Amplifier Thermocouple Cold Junction Comparator Zero Drift Amplifier SOT-23 Zero Drift Amplifier COMMENTS VOS = 120V MAX, IOS = 280pA MAX Micropower, 0.5C Initial Accuracy VOS = 5V MAX, AVOL = 1V/V MAX VOS = 3V MAX
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 FAX: (408) 434-0507 www.linear-tech.com
U
N8 Package 8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.400* (10.160) MAX 8 7 6 5 .255 .015* (6.477 0.381) 1 2 3 4 .130 .005 (3.302 0.127) .045 - .065 (1.143 - 1.651) .065 (1.651) TYP .120 (3.048) .020 MIN (0.508) MIN .018 .003 (0.457 0.076)
N8 1002
.100 (2.54) BSC
001fa LT/LT 0305 REV A * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 2001

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