LTK001CN8 [Linear]

Thermocouple Cold Junction Compensator and Matched Amplifier; 热电偶冷端补偿和匹配放大器


型号：	LTK001CN8
厂家：	Linear
描述：	Thermocouple Cold Junction Compensator and Matched Amplifier 热电偶冷端补偿和匹配放大器模拟IC 信号电路放大器光电二极管
文件：	总8页 (文件大小：101K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LTK001

Thermocouple Cold Junction

Compensator and

Matched Amplifier

thermocouple applications. It has low supply current to

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

highgain,andextremelylowinputbiascurrents(<600pA)

to allow high impedance input filters to be used without

degrading offset voltage or drift.

FEATURES

■

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

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.

■

480µA Typical Supply Current

■

Available in 8-Pin DIP Package

APPLICATIO S

■

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.

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^®1025 cold

junction compensator. The amplifier, which is also avail-

able separately as LTKA0x has been specially selected for

For multiple thermocouple applications using one com-

pensator,amplifiersmaybeorderedseparately(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.

TYPICAL APPLICATIO

Type K 10mV/°C Thermometer

R3**

255k

100Ω

FULL-SCALE TRIM 1%

0.1µF

–

OUT

10mV/°C

LTKA0x

–

0.1µF

LT1025

–

TYPE K

–

GND

–

R4*

, R4 IS NOT REQUIRED (OPEN) FOR

R4 ≤

30µA

LT1025 TEMPERATURES ≥ 0°C.

–

**SELECTED FOR 0°C–100°C RANGE

LTK001 TA01

001fa

LTK001

W W U W

ABSOLUTE AXI U RATI GS

(Note 1)

Both Devices

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

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°C

Compensator (LT1025)

Supply Voltage (V_INto Ground Pin)......................... 36V

Output Voltage (Forced) ............................................ 5V

Output Short-Circuit Duration.......................... Indefinite

U W

PACKAGE/ORDER I FOR ATIO

TOP VIEW

TRIM

TOP VIEW

51.7µV/°C

60.9µV/°C

TRIM

–IN

TRIM

–IN

+IN

K,T

40.6µV/°C

R,S

–

OUT

10mV/°C

+IN

OUT

OVER COMP

6µV/°C

–

GND

–

OVER COMP

COMMON

–

N8 PACKAGE

8-LEAD PDIP

COMPENSATOR

(LT1025)

N8 PACKAGE

8-LEAD PDIP AMPLIFIER

(LTKA0x)

H PACKAGE

8-LEAD TO-5 METAL CAN

AMPLIFIER (LTKA0x)

= 100°C, θ = 130°C/W

JMAX

= 100°C, θ = 130°C/W (N8)

JMAX

= 150°C, θ = 150°C/W, θ = 45°C/W

JA JC

JMAX

ORDER PART NUMBER

AMPLIFIER ONLY

(Note A)

AMPLIFIER ONLY

(Note A)

KIT

LTK001CN8

LTK001ACN8

LTKA00MH

LTKA01MH

LTKA00CN8

LTKA01CN8

J8 PACKAGE

8-LEAD CERDIP

COMPENSATOR

(LT1025)

= 150°C, θ = 100°C/W (J8)

JMAX

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.

001fa

LTK001

ELECTRICAL CHARACTERISTICS _{(Matched Amplifier and Compensator)}

T_A= 25°C, V_S= ±15V (Amplifier), V_S= 5V (Compensator)

LTK001A

TYP

LTK001

TYP

PARAMETER

CONDITIONS

MIN

MAX

0.75

0.86

5.0

0.05

0.06

0.07

0.28

2.0

2.1

2.6

MIN

MAX

UNITS

°C

Total Temperature Error at 25°C

(Note 3)

Type E

2.5

5.0

0.09

0.10

0.32

Type J

°C

Type K, T

Type R, S

Type E

°C

(Note 12)

°C

Slope Error (Notes 4 and 9)

0°C ≤ T ≤ 70°C

°C/°C

°C

Type J

Type K, T

Type R, S

Type E

Total Temperature Error at

Temperature Extremes (Note 9)

0°C ≤ T ≤ 70°C

Type J

°C

Type K, T

Type R, S

Type E

5.2

°C

(Note 12)

°C

– 55°C ≤ T ≤ 125°C

8.5

°C

Type J

°C

Type K, T

Type R, S

6.3

°C

Temperature Error Change with

Supply Voltage (Note 5)

0.1

°C/V

Supply Current

480

900

480

900

µA

001fa

LTK001

ELECTRICAL CHARACTERISTICS _{(Compensator LT1025)}

The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T_A= 25°C.

V_S= 5V unless otherwise noted.

COMPENSATOR (LT1025)

PARAMETER

CONDITIONS

T = 25°C, LTK001A

T = 25°C, LTK001

MIN

TYP

MAX

UNITS

Temperature Error at 10mV/°C Output (Note 9)

0.3

0.5

2.0

°C

Full Temperature Span

●

See Curve on LT1025 Data Sheet

Temperature Error at Individual Outputs (Note 10) LTK001A: E, J, K, T

LTK001A: R, S

0.4

0.75

1.5

°C

LTK001: E, J, K, T

LTK001: R, S

0.8

1.2

2.4

3.5

°C

Full Temperature Span

See Curve on LT1025 Data Sheet

Supply Current

4V ≤ V ≤ 36V

100

150

200

0.05

0.02

µA

0°C ≤ T ≤ 70°C

●

– 55°C ≤ T ≤ 125°C

µA

Change in Supply Current

Line Regulation (Note 11)

4V ≤ V ≤ 36V

0.01

µA/V

°C/V

4V ≤ V ≤ 36V

●

0.003

10mV/°C Output

Load Regulation (Note 11)

Divider Impedance

0 ≤ I ≤ 1mA

0.04

0.2

°C

10mV/°C Output

K, T

R, S

2.5

2.1

4.4

3.8

kΩ

001fa

LTK001

ELECTRICAL CHARACTERISTICS _{(Amplifier LTKA0x)}

The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T_A= 25°C.

V_S= ±15V, V_CM= 0V, T_J= 25°C unless otherwise noted.

AMPLIFIER (LTKA0x)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

µV

Input Offset Voltage

Input 0ffset Voltage Drift with Temperature

Input Bias Current

(Note 6)

●

0.3

1.5

µV/°C

0°C ≤ T ≤ 70°C

●

±200

±300

±600

±1500

– 55°C ≤ T ≤ 125°C

Input Bias Current Drift with Temperature

lnput 0ffset Current

(Note 6)

pA/°C

0°C ≤ T ≤ 70°C

●

±100

±200

±500

±700

– 55°C ≤ T ≤ 125°C

lnput Offset Current Drift with Temperature

Large Signal Voltage Gain

(Note 6)

●

0.6

2000

130

pA/°C

V/mV

R = 10kΩ

400

106

0.75

Common Mode Rejection Ratio

Power Supply Rejection Ratio

= ±13.5V

±2.5V ≤ V ≤ ±20V (Note 5)

125

–

Common Mode Input Voltage Range

Notes 6, 7

Above V

Below V

1.0

Output Voltage Swing (Notes 6, 8)

Referred to Supplies

= 0.1mA

= 1mA

0.8

1.1

OUT

Supply Current

●

400

800

µA

–

Supply Voltage Range

Total V to V Voltage

4.5

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

Note 9: Temperature error is defined as the deviation from the following

formula:

= α(T) + αß(T – 25°C)

OUT

differential voltage rating does not apply.

α = Typical thermocouple Seebeck coefficient as follows,

E = 60.9µV/°C, J = 51.7µV/°C, K, T = 40.6µV/°C, R, S = 5.95µV/°C.

α = 10mV/°C at the 10mV output.

Note 3: Total temperature error is the overall error at 25°C 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.

ß = Nonlinearity coefficient built into the LT1025 to help compensate

–4

for the nonlinearities of thermocouples. ß = 5.5 x 10 , generating

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.

0.34°C bow for 25°C temperature change, and 1.36°C bow for 50°C

change.

Note 10: Temperature error at the individual outputs is the sum of the

10mV/°C output error plus the resistor divider error.

Note 5: This is a worst-case limit assuming that any or all supply voltages

change.

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:

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 5µV.

∆V

(Line) = ∆V (I + I )(150°C/W)

IN q load

OUT

(Load)= (∆I

(V )(150°C/W)

load) IN

OUT

= LT1025 supply current

Load regulation is 30µA ≤ I ≤ 1mA for T ≤ 0°C.

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.

001fa

LTK001

PACKAGE DESCRIPTIO

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

.165 – .185

(4.191 – 4.699)

REFERENCE

PLANE

SEATING

PLANE

GAUGE

PLANE

.500 – .750

(12.700 – 19.050)

.010 – .045*

(0.254 – 1.143)

.016 – .021**

(0.406 – 0.533)

.027 – .045

(0.686 – 1.143)

45°

PIN 1

.028 – .034

(0.711 – 0.864)

.200

(5.080)

TYP

.110 – .160

(2.794 – 4.064)

INSULATING

STANDOFF

*LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE

AND THE SEATING PLANE

.016 – .024

(0.406 – 0.610)

**FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS

H8(TO-5) 0.200 PCD 0204

OBSOLETE PACKAGE

001fa

LTK001

PACKAGE DESCRIPTIO

J8 Package

8-Lead CERDIP (Narrow .300 Inch, Hermetic)

(Reference LTC DWG # 05-08-1110)

.405

(10.287)

MAX

CORNER LEADS OPTION

(4 PLCS)

.005

(0.127)

MIN

.023 – .045

(0.584 – 1.143)

HALF LEAD

OPTION

.025

(0.635)

RAD TYP

.220 – .310

(5.588 – 7.874)

.045 – .068

(1.143 – 1.650)

FULL LEAD

OPTION

.200

.300 BSC

(5.080)

MAX

(7.62 BSC)

.015 – .060

(0.381 – 1.524)

.008 – .018

(0.203 – 0.457)

0° – 15°

.045 – .065

(1.143 – 1.651)

.125

3.175

MIN

NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE

OR TIN PLATE LEADS

.014 – .026

(0.360 – 0.660)

.100

(2.54)

BSC

J8 0801

OBSOLETE PACKAGE

001fa

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-

tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.

LTK001

PACKAGE DESCRIPTIO

N8 Package

8-Lead PDIP (Narrow .300 Inch)

(Reference LTC DWG # 05-08-1510)

.400*

(10.160)

MAX

.255 ± .015*

(6.477 ± 0.381)

.130 ± .005

.300 – .325

.045 – .065

(3.302 ± 0.127)

(1.143 – 1.651)

(7.620 – 8.255)

.065

(1.651)

TYP

.008 – .015

(0.203 – 0.381)

.120

.020

(0.508)

MIN

(3.048)

MIN

+.035

.325

–.015

.018 ± .003

(0.457 ± 0.076)

.100

(2.54)

BSC

+0.889

8.255

(

)

N8 1002

–0.381

NOTE:

INCHES

MILLIMETERS

1. DIMENSIONS ARE

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)

RELATED PARTS

PART NUMBER

DESCRIPTION

COMMENTS

= 120µV MAX, I = 280pA MAX

LT1012

Picoamp Input Current Amplifier

Thermocouple Cold Junction Comparator

Zero Drift Amplifier

LT1025

Micropower, 0.5°C Initial Accuracy

LTC1050

LTC2050

= 5µV MAX, A

= 1V/µV MAX

VOL

SOT-23 Zero Drift Amplifier

= 3µV MAX

001fa

LT/LT 0305 REV A • PRINTED IN USA

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

●

(408)432-1900 FAX:(408)434-0507 www.linear-tech.com

LTK001CN8 [Linear]

相关型号：

LTK001J

LTK001MJ

LTK001MJ#PBF

LTK001MJ/883B

LTK001MJ8

LTK001N

LTK001_09

LTK00CN8

LTK00MH

LTK01CN8

LTK01MH

LTK4N25