ltk001 Linear Technology Corporation, ltk001 Datasheet

ltk001

Manufacturer Part Number

ltk001

Description

Thermocouple Cold Junction Compensator And Matched Amplifier

Manufacturer

Linear Technology Corporation

Datasheet

1.LTK001.pdf (8 pages)

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FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

■

APPLICATIO S

■

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

junction compensator. The amplifier, which is also avail-

able separately as LTKA0x has been specially selected for

0.75°C Initial Accuracy (A Version)

Extremely Low Warmup Drift

Preset Outputs for Type E, J, K, R, S, T

Single 5V to ± 20V Operation

480µA Typical Supply Current

Available in 8-Pin DIP Package

Thermocouple Cold Junction Compensation

GND

LT1025

V +

R –

V –

R4*

–

TYPE K

Type K 10mV/°C Thermometer

1025 cold

0.1µF

FULL-SCALE TRIM

100Ω

**SELECTED FOR 0°C–100°C RANGE

* R4 ≤

LT1025 TEMPERATURES ≥ 0°C.

30µA

–

V –

LTKA0x

Thermocouple Cold Junction

thermocouple applications. It has low supply current to

minimize warmup drift, very low offset voltage (<35µV),

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

60.9µV/°C (E), 51.7µV/°C (J), 40.6µV/°C (K, T), and

5.95µV/°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 com-

pensator, amplifiers may be ordered separately (LTKA0x),

still matched to the compensator.

trademarks are the property of their respective owners. For typical performance curves and

applications circuits consult the LT1025 data sheet.

R3**

255k

, R4 IS NOT REQUIRED (OPEN) FOR

V +

V –

, LTC and LT are registered trademarks of Linear Technology Corporation. All other

0.1µF

10mV/°C

OUT

Matched Amplifier

Compensator and

LTK001 TA01

LTK001

001fa

Related parts for ltk001

ltk001 Summary of contents

Page 1

... APPLICATIO S ■ Thermocouple Cold Junction Compensation U 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 junction compensator. The amplifier, which is also avail- ...

Page 2

... Consult factory for parts specified with wider operating temperature ranges (Note 1) Both Devices Operating Temperature Range LTK001AMJ8, LTK001MJ8 (OBSOLETE) ......................................................... – 55°C to 125°C LTK001ACN8, LTK001CN8 ...................... 0°C to 70°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature Range (Soldering, 10 sec.)...... 300° TOP VIEW V TRIM ...

Page 3

... Type J Type K, T Type R, S (Note 12) ≤ 70°C Type E Type J Type K, T Type R, S ≤ 70°C Type E Type J Type K, T Type R, S (Note 12) ≤ 125°C Type E J Type J Type K, T Type R, S (Note 12) LTK001 LTK001 TYP MAX MIN TYP MAX 0.75 2.5 0.75 2.5 0.86 2.5 5.0 5.0 0.05 0.09 0.06 0.09 0.07 0.10 0.28 0.32 2 ...

Page 4

... LT1025) CONDITIONS T = 25°C, LTK001A 25°C, LTK001 J ● Full Temperature Span LTK001A LTK001A LTK001 LTK001 ● Full Temperature Span 4V ≤ V ≤ 36V IN ● 0°C ≤ T ≤ 70°C J ● – 55°C ≤ T ≤ 125° ≤ ...

Page 5

... Load regulation is 30µA ≤ I Note 12: Larger errors with type R and S thermocouples are due mostly to 35µV offset of the amplifier. This error can be reduced to 5µV max with the ® LTC 1050 or LTC1052 operational amplifiers. LTK001 = 25°C. A AMPLIFIER (LTKA0x) MIN TYP ...

Page 6

... LTK001 PACKAGE DESCRIPTIO SEATING PLANE 45° 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 .050 (1.016) MAX (1.270) MAX .010 – .045* (0.254 – 1.143) .016 – ...

Page 7

... HALF LEAD OPTION .025 (0.635) RAD TYP 1 0° – 15° .045 – .065 (1.143 – 1.651) .014 – .026 (0.360 – 0.660) OBSOLETE PACKAGE LTK001 .405 (10.287) MAX .220 – .310 (5.588 – 7.874 .200 (5 ...

Page 8

... LTK001 PACKAGE DESCRIPTIO .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) +.035 .325 –.015 ( ) +0.889 8.255 –0.381 NOTE: 1. DIMENSIONS ARE MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) ...

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