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LM285BXH-1.2 Arkusz danych(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numer części LM285BXH-1.2
Szczegółowy opis  Micropower Voltage Reference Diode
Download  11 Pages
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Producent  NSC [National Semiconductor (TI)]
Strona internetowa  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM285BXH-1.2 Arkusz danych(HTML) 7 Page - National Semiconductor (TI)

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Typical Applications (Continued)
METER THERMOMETERS
0˚C−100˚C Thermometer
00551828
Calibration
1. Short LM385-1.2, adjust R3 for IOUT= temp at 1µA/˚K
2. Remove short, adjust R2 for correct reading in centigrade
†IQ at 1.3V.500µA
IQ at 1.6V.2.4mA
Lower Power Thermometer
00551829
*2N3638 or 2N2907 select for inverse HFE . 5
†Select for operation at 1.3V
‡IQ . 600µA to 900µA
0˚F−50˚F Thermometer
00551830
Calibration
1. Short LM385-1.2, adjust R3 for IOUT= temp at 1.8µA/˚K
2. Remove short, adjust R2 for correct reading in ˚F
Micropower Thermocouple Cold Junction
Compensator
00551831
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
5231.24k
15.60
14.32
T
42.8
432 1k
12.77
11.78
K
40.8
412953
12.17
11.17
S
6.4
63.4150
1.908
1.766
Typical supply current 50µA
www.national.com
7


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