LM45CIM3X National Semiconductor, LM45CIM3X Datasheet - Page 7

• Manufacturer Part Number: LM45CIM3X
• Description: IC, TEMPERATURE SENSOR, ± 3°C, 3-SOT-23
• Manufacturer: National Semiconductor

Specifications of LM45CIM3X

• Ic Output Type: Voltage
• Sensing Accuracy Range: ± 3°C
• Supply Current: 120µA
• Supply Voltage Range: 4V To 10V
• Sensor Case Style: SOT-23
• No. Of Pins: 3
• Termination Type: SMD
• Temperature Sensor Function: Temp Sensor
• Output Type: Analog
• Package Type: SOT-23
• Operating Temperature (min): -40C
• Operating Temperature (max): 125C
• Operating Temperature Classification: Automotive
• Operating Supply Voltage (min): 4V
• Operating Supply Voltage (typ): 5/9V
• Operating Supply Voltage (max): 10V
• Filter Terminals: SMD
• Rohs Compliant: No
• Accuracy %: 3°C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Typical Applications
CAPACITIVE LOADS
Like most micropower circuits, the LM45 has a limited ability
to drive heavy capacitive loads. The LM45 by itself is able to
drive 500 pF without special precautions. If heavier loads are
anticipated, it is easy to isolate or decouple the load with a
resistor; see Figure 4. Or you can improve the tolerance of
capacitance with a series R-C damper from output to
ground; see Figure 5.
Any linear circuit connected to wires in a hostile environment
can have its performance affected adversely by intense elec-
tromagnetic sources such as relays, radio transmitters, mo-
tors with arcing brushes, SCR transients, etc, as its wiring
can act as a receiving antenna and its internal junctions can
01175414
act as rectifiers. For best results in such cases, a bypass
FIGURE 7. 4-to-20 mA Current Source (0˚C to +100˚C)
capacitor from V
to ground and a series R-C damper such
IN
as 75Ω in series with 0.2 or 1 µF from output to ground, as
shown in Figure 5, are often useful.
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FIGURE 4. LM45 with Decoupling from Capacitive Load
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FIGURE 5. LM45 with R-C Damper
FIGURE 8. Fahrenheit Thermometer
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FIGURE 9. Centigrade Thermometer (Analog Meter)
FIGURE 6. Temperature Sensor,
Single Supply, −20˚C to +100˚C
7
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