13

LTC1051/LTC1053

10513fa

–

+

0.1µF

0.1µF

1/2

LTC1051

1/2

LTC1051

Q1

Q1

0.0022µF

22pF

10k

0.1%

1k

0.1%

2M

15.8k

0.1%

3k

0.1%

1N4148

5V

5V

2.5V

–5V

1

2

3

4

5

6

7

8

2.5M

0.1%

LT1009

Q1: TEL LAB TYPE Q81

ADJUST 2M POR. FOR NONLINEARITIES

1051/53 AC05

Six Decade Log Amplifier

Dual Instrumentation Amplifier

Linearized Platinum Signal Conditioner

–

+

1/2

LTC1051

5

6

7

5V

1µF

1µF

–

+

1/2

LTC1051

3

2

1

5V

8

4

6

5

2

3

4

18

17

16

1µF

7

11

12

14

13

0.01µF

1k

GAIN

ADJUST

5k

1k

8.06k*

0V TO 4V =

0°C TO 400°C

±0.05°C

8.25k*

274k*

10k*

50k

ZERO

ADJUST

250k*

LT1009

2.5V

2.4k

RP = ROSEMOUNT 118MFRTD

*1% FILM RESISTOR

TRIM SEQUENCE:

SET SENSOR TO 0°C VALUE. ADJUST ZERO FOR 0V OUT

SET SENSOR TO 100°C VALUE. ADJUST GAIN FOR 1.000V OUT

SET SENSOR TO 400°C VALUE. ADJUST LINEARITY FOR 4.000V OUT

REPEAT AS REQUIRED. FOR MORE INFORMATION REFER TO AN3

15

887Ω

1µF

0.1µF

2k

1/2 LTC1043

1/2 LTC1043

100Ω

AT 0°C

1051/53 AC07

(LINEARITY CORRECTION LOOP)

8

–

+

1/2

LTC1051

3

2

1

1k

0.22µF

100k

5V

5V

1µF

1µF

–

+

1/2

LTC1051

5

6

7

4

8

1k

0.22µF

0.0047µF

100k

1µF

8

7

11

12

14

13

1µF

5

6

2

3

17

15

18

4

16

–

+

–

+

INPUT 1

INPUT 2

GAIN = 101V/DIV

CMRR >100dB

1051/53 AC06

LTC1043

TYPICAL APPLICATIO S