LM285BXM-1.2 National Semiconductor, LM285BXM-1.2 Datasheet - Page 6
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LM285BXM-1.2
Manufacturer Part Number
LM285BXM-1.2
Description
IC, VOLT REF, 1.2V, MICROPWR, 8SOIC
Manufacturer
National Semiconductor
Datasheet
1.LM285BXM-1.2.pdf
(10 pages)
Specifications of LM285BXM-1.2
Topology
Shunt
Reference Voltage Tolerance
12mV
Voltage Reference Case Style
SOIC
No. Of Pins
8
Operating Temperature Range
-40°C To +85°C
Svhc
No SVHC
Temperature Coefficient
30ppm/°C
Reference Voltage
1.2V
Rohs Compliant
Yes
Fixed / Adjust / Prog
Precision
Output Voltage (max)
1.235V
Reference Voltage Accuracy (max)
1
Load Regulation
10mV
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
8
Package Type
SOIC N
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Company
Part Number
Manufacturer
Quantity
Price
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Part Number:
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METER THERMOMETERS
Calibration
1. Short LM385-1.2, adjust R3 for I
2. Remove short, adjust R2 for correct reading in centigrade
Calibration
1. Short LM385-1.2, adjust R3 for I
2. Remove short, adjust R2 for correct reading in °F
Micropower Thermocouple Cold Junction Compensator
0°C−100°C Thermometer
0°F−50°F Thermometer
OUT
OUT
= temp at 1μA/°K
= temp at 1.8μA/°K
551830
551828
551831
6
†I
I
*2N3638 or 2N2907 select for inverse H
†Select for operation at 1.3V
‡I
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.
Typical supply current 50μA
Q
Thermocoup
Q
Q
at 1.6V 2.4mA
at 1.3V 500μA
≃ 600μA to 900μA
Type
le
K
S
J
T
Lower Power Thermometer
Coefficient (Ω) (Ω)
Seebeck
(μV/°C)
52.3
42.8
40.8
6.4
63.
R1 R2
52
43
41
3
2
2
4
FE
1.2
3Ω
0Ω
4k
1k
95
15
5
Voltage
@ 25°C
Across
15.60
12.77
12.17
1.908
(mV)
R1
551829
Voltage
Across
14.32
11.78
11.17
1.766
(mV)
R2