LM3911 datasheet(5/8 Pages) NSC

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Typical Applications (Continued)

Thermometer With Meter Output

R1 e

(VZ) 001DT

IM (VZ b 001 TO)

Select IQ s

R2 e

001 TO b IQR1

R3 e

R1 b R2

IQs2VR1J

Vz e Shunt regulator voltage (use 685)

T e Meter temperature span ( K)

IM e Meter full scale current (A)

TO e Meter zero temperature ( K)

IQ e Current through R1 R2 R3 at zero

meter current (10 mA to 10 mA) (A)

Values shown for

TO e 300 K DT e 100 K

IM e 10 mA IQ e 100 mA

The 001 in the above and following equations is in units of V KorV C

and is a result of the basic 001V K sensitivity of the transducer

Ground Referred Thermometer

R1 e

(VZ)(10mV)(DT)

(VZ b 001 TO)

R2 e

001 TO b IQ R1

R3 e

R1 b R2

Shunt regulator voltage

Temperature span ( K)

Temperature for zero output ( K)

VO e Full scale output voltages10V

Current through R1 R2 R3

at zero output voltage

(typically 100 mA to 10 mA)

Meter Thermometer With Trimmed Output

Selected as for meter thermometer except TO should

be 5 K more than desired and IQ e 100 mA

Calibrates TO

Ground Referred Centigrade Thermometer

Set zero

Two Terminal Temperature to Current Transducer

R2 (X) e

VZ b 001 TL

JIHb001TH

J a VZb001THJ001TL

001

R1 R3

TH(VZ b 001 TL) b TL(VZ b 001 TH)

(

R3(X) t

THT

IH b

IL TH

(VZ b 001 TL)(R2)

(R2)(001 TL)

VZb001TL

–

TL e Temperature for IL (K)

TH e Temperature for IH (K)

VZ e Zener voltage (V)

Low temperature output current (A)

IH e High temperature output current (A)

Values shown for IOUTe1mAto10mAfor 10 Fto100 F

Set temperature

TLH5701 – 4

The 001 in the above and following equations is in units of V KorV C and is a result of the basic 001V K sensitivity of the transducer

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