LM385Z-2.5 Datasheet, PDF (8/22 Pages) Texas Instruments – LM185-2.5-N/LM285-2.5-N/LM385-2.5-N Micropower Voltage Reference Diode

LM185-2.5-N, LM285-2.5-N, LM385-2.5-N
SNVS743D – DECEMBER 1999 – REVISED MARCH 2013
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Calibration
1. Short LM385-2.5-N, adjust R3 for I_OUT=temp at 1μA/°K.
2. Remove short, adjust R2 for correct reading in centigrade
Figure 20. 0°C–100°C Thermomemter
Calibration
1. Short LM385-2.5-N, adjust R3 for I_OUT=temp at 1.8 μA/°K
2. Remove short, adjust R2 for correct reading in °F
Figure 21. 0°F–50°F Thermomemter
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.
Figure 22. Micropower Thermocouple Cold Junction Compensator
Thermocouple Type⁽¹⁾
J
T
K
S
(1) Typical supply current 50 μA
Seebeck
Coefficient
(_μV/°C)
52.3
42.8
40.8
6.4
R1
R2
(Ω)
(Ω)
523
1.24k
432
1k
412
953Ω
63.4
150Ω
Voltage Across R1
@25°C
(mV)
15.60
12.77
12.17
1.908
Voltage Across R2
(mV)
14.32
11.78
11.17
1.766
8
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