LTC6943

11

6943f

50MHz Thermal RMS/DC Converter

6943 • TA14

887Ω*

1mA

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 1000V OUT

SET SENSOR TO 400°C VALUE. ADJUST LINEARITY FOR 4000V OUT

REPEAT AS REQUIRED

1µF

8.06k*

1k*

5k

0V TO 4V = 0°C TO 400°C

±0.05°C

1µF

2k

100Ω

AT 0°C

10

9

6

1µF

0.1µF

1/2 LTC6943

7

12

11

4

1µF

1/2 LTC6943

5

16

14

5V

5V

250k*

(LINEARITY CORRECTION LOOP)

2.4k

2.74k*

8.25k*

50k

ZERO

ADJUST

LT1009

2.5V

10k*

3

2

4

1

8

5

6

7

1k

GAIN

ADJUST

–

+

1/2 LT1013

–

+

1/2 LT1013

3

13

15

0.01µF

2

1

*

LINEARITY

ADJUST

TYPICAL APPLICATIO S

6943 • TA13

30k**

30k**

100k*

301Ω*

10k

DC OUTPUT

0V TO 3.5V

10k

10k

RED

RED

BRN

T1

T2

GRN

300mV–

INPUT

0.01µF

GRN

BRN

CALIBRATION ADJUST

20k

5V

5V

5V

10k

10k

3

2

4

1

8

5

6

7

2% ACCURACY DC-50MHZ

100:1 CREST FACTOR CAPABILITY

T1 – T2 = YELLOW SPRINGS INST. CO.

THERMISTOR COMPOSITE

ENCLOSE T1 AND T2 IN STYROFOAM

*1% RESISTOR

**0.1% RESISTOR

2

1

3

5

1µF

1µF

1µF

0.01µF

1µF

1/2 LTC6943

4

13

5V

16

15

14

–

+

–

+

LT1013

LT1013

Single Supply Precision Linearized Platinum RTD Signal Conditioner