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LM185H-1.2 Fiches technique(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce LM185H-1.2
Description  Micropower Voltage Reference Diode
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM185H-1.2 Fiches technique(HTML) 6 Page - National Semiconductor (TI)

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Typical Applications (Continued)
METER THERMOMETERS
0˚C−100˚C Thermometer
DS005518-28
Calibration
1. Short LM385-1.2, adjust R3 for IOUT= temp at 1 µA/˚K
2. Remove short, adjust R2 for correct reading in centigrade
†IQ at 1.3V500 µA
IQ at 1.6V2.4 mA
Lower Power Thermometer
DS005518-29
*2N3638 or 2N2907 select for inverse HFE 5
†Select for operation at 1.3V
‡IQ 600 µA to 900 µA
0˚F−50˚F Thermometer
DS005518-30
Calibration
1. Short LM385-1.2, adjust R3 for IOUT= temp at 1.8 µA/˚K
2. Remove short, adjust R2 for correct reading in ˚F
Micropower Thermocouple Cold Junction
Compensator
DS005518-31
Adjustment Procedure
1. Adjust TC ADJ pot until voltage across R1 equals Kelvin temperature
multiplied by the thermocouple Seebeck coefficient.
2. Adjust zero ADJ pot until voltage across R2 equals the thermocouple
Seebeck coefficient multiplied by 273.2.
Thermocouple
Seebeck
R1
R2
Voltage
Voltage
Type
Coefficient
(
Ω)(Ω)
Across R1
Across R2
(µV/˚C)
@ 25˚C
(mV)
(mV)
J
52.3
523 1.24k
15.60
14.32
T
42.8
432
1k
12.77
11.78
K
40.8
412 953
12.17
11.17
S
6.4
63.4 150
1.908
1.766
Typical supply current 50 µA
www.national.com
6


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