LM385M3-2.5 National Semiconductor, LM385M3-2.5 Datasheet - Page 9

• Manufacturer Part Number: LM385M3-2.5
• Description: IC, SHUNT V-REF, 2.5V, 2%, 3-SOT-23
• Manufacturer: National Semiconductor

Specifications of LM385M3-2.5

• Topology: Shunt
• Reference Voltage: 2.5V
• Reference Voltage Tolerance: 25mV
• Voltage Reference Case Style: SOT-23
• No. Of Pins: 3
• Temperature Coefficient: 150ppm/°C
• Fixed / Adjust / Prog: Precision
• Output Voltage (max): 2.5V
• Reference Voltage Accuracy (max): 3
• Load Regulation: 20mV
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 3
• Package Type: SOT-23
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Adjustment Procedure
1.
2.
Typical supply current 50 μA
Adjust TC ADJ pot until voltage across R1 equals Kelvin temperature multiplied by the thermocouple Seebeck coefficient.
Adjust zero ADJ pot until voltage across R2 equals the thermocouple Seebeck coefficient multiplied by 273.2.
Thermocouple
Micropower Thermocouple Cold Junction Compensator
Type
T
K
S
J
Improving Regulation of Adjstable Regulators
Seebeck
efficient
(
μ
52.3
42.8
40.8
Co-
V/°C)
6.4
63.4 150Ω
523 1.24k
432
412 953Ω
(Ω)
R1
9
(Ω)
R2
1k
Across R1
551907
Voltage
@25°C
15.60
12.77
12.17
1.908
(mV)
Across R2
551906
Voltage
14.32
11.78
11.17
1.766
(mV)
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