LTC6943 查看數據表（PDF） - Linear Technology

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LTC6943

Micropower, Dual Precision Instrumentation Switched Capacitor Building Block

Linear Technology 

LTC6943

TYPICAL APPLICATIO S

50MHz Thermal RMS/DC Converter

5V

5V

300mV–

10VRMS

INPUT

BRN

T1

30k**

30k**

10k

0.01µF

10k

RED

RED

T2

3

1/2 LTC6943

5

4

1

1µF

1µF

2

14

16

13

1µF

15

BRN

GRN

GRN

5V

3+ 8

LT1013

2–

4

1µF

0.01µF

CALIBRATION ADJUST

5V

1

20k

5+

100k*

LT1013

6–

301Ω* 10k

7

DC OUTPUT

0V TO 3.5V

10k

10k

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

6943 • TA13

2k

1µF

Single Supply Precision Linearized Platinum RTD Signal Conditioner

5V

3+ 8

1

1/2 LT1013

2–

4

0.1µF

1/2 LTC6943

6

7

250k*

10k*

2.4k 5V

2.74k*

50k

ZERO

ADJUST

LT1009

2.5V

8.25k*

3

1/2 LTC6943

4

5

9

1µF

10

887Ω*

1

1µF

2

(LINEARITY CORRECTION LOOP)

0V TO 4V = 0°C TO 400°C

5+

± 0.05°C

7

1/2 LT1013

6–

1k

GAIN

5k

LINEARITY

ADJUST

ADJUST

1µF

8.06k*

11

12

13

16

1k*

Rp

Rp = ROSEMOUNT 118MFRTD

1mA

100Ω

*1% FILM RESISTOR

AT 0°C

14

15

0.01µF

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

6943 • TA14

6943f

11

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