2

LT1025

1025fb

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Temperature Error at

10mV/

°C Output (Notes 4, 5)

LT1025A

0.3

0.5

°C

LT1025

0.5

2.0

°C

Full Temperature Span

q

See Curve

Resistor Divider Accuracy

(Notes 2, 4)

LT1025A

E

60.6

60.9

61.3

µV/°C

J

51.4

51.7

52.1

µV/°C

K, T

40.3

40.6

41.0

µV/°C

R, S

5.8

5.95

6.2

µV/°C

LT1025

E

60.4

60.9

61.6

µV/°C

J

51.2

51.7

52.3

µV/°C

K, T

40.2

40.6

41.2

µV/°C

R, S

5.75

5.95

6.3

µV/°C

Supply Current

4V

50

80

100

µA

LT1025AC, LT1025C

q

50

150

µA

LT1025AM, LT1025M

q

200

µA

Line Regulation (Note 3)

4V

q

0.003

0.02

°C/V

Load Regulation (Note 3)

0

q

0.04

0.2

°C

Divider Impedance

E

2.5

k

Ω

J

2.1

k

Ω

K, T

4.4

k

Ω

R, S

3.8

k

Ω

Change in Supply Current

4V

0.01

0.05

µA/V

(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

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

30

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

ELECTRICAL CHARACTERISTICS

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)/

(40.6

µV/°C) = 0.5°C + 0.25°C = 0.75°C.

Note 5: Temperature error is defined as the deviation from the following

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.

1

2

3

4

8

7

6

5

TOP VIEW

S8 PACKAGE

8-LEAD PLASTIC SO

N8 PACKAGE

8-LEAD PDIP

J

51.7

µV/°C

K, T

40.6

µV/°C

R, S

6

µV/°C

COMMON

E

60.9

µV/°C

10mV/

°C

GND

ORDER PART

NUMBER

LT1025ACN8

LT1025CN8

LT1025CS8

J8 PACKAGE 8-LEAD CERDIP

LT1025AMJ8

LT1025MJ8

OBSOLETE PACKAGE

Consider the N8 Package for Alternate Source

Consult LTC Marketing for parts specified with wider operating temperature ranges.

S8 PART MARKING

1025