11

LT1236

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.

Ultra-Linear Platinum Temperature Sensor*

EQUIVALE T SCHE ATIC

D1

D2

D3

R1

R2

GND

LT1236 ES

Q1

Q2

D4

6.3V

OUTPUT

–

+

A1

INPUT

Q3

LT1236-10

OUT

IN

GND

LT1236 TA09

–

+

†

100

Ω AT

0

°C

R4

4.75k

1%

R5

200k

1%

R6

619k

1%

7

4

6

2

3

LT1001

–15V

20V

R13

24.3k

R12

1k

R15

10k

R14

5k

654k

R11

6.65M

1%

R10

182k

1%

R2*

5k

R1**

253k

R3**

5k

R9

100k

R8

10M

–15V

–50

°C ≤ T ≤ 150°C

R7

392k

1%

20V

STANDARD INDUSTRIAL 100

Ω PLATINUM 4-WIRE SENSOR,

ROSEMOUNT 78S OR EQUIVALENT.

α = 0.00385

USE TRIM SEQUENCE AS SHOWN. TRIMS ARE NONINTERACTIVE

SO THAT ONLY ONE TRIM SEQUENCE IS NORMALLY REQUIRED.

FEEDBACK LINEARIZES OUTPUT TO

± 0.005°C FROM

–50

°C TO 150°C

WIREWOUND RESISTORS WITH LOW TC

†

*

**