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LM35CAH Datasheet(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
No. de pieza LM35CAH
Descripción Electrónicos  Precision Centigrade Temperature Sensors
Download  13 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM35CAH Datasheet(HTML) 7 Page - National Semiconductor (TI)

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Typical Applications
CAPACITIVE LOADS
Like most micropower circuits, the LM35 has a limited ability
to drive heavy capacitive loads. The LM35 by itself is able to
drive 50 pf without special precautions. If heavier loads are
anticipated, it is easy to isolate or decouple the load with a
resistor; see
Figure 3. Or you can improve the tolerance of
capacitance with a series R-C damper from output to
ground; see
Figure 4.
When the LM35 is applied with a 200
Ω load resistor as
shown in
Figure 5, Figure 6 or Figure 8 it is relatively immune
to wiring capacitance because the capacitance forms a by-
pass from ground to input, not on the output. However, as
with any linear circuit connected to wires in a hostile envi-
ronment, its performance can be affected adversely by in-
tense electromagnetic sources such as relays, radio trans-
mitters, motors with arcing brushes, SCR transients, etc, as
its wiring can act as a receiving antenna and its internal
junctions can act as rectifiers. For best results in such cases,
a bypass capacitor from V
IN to ground and a series R-C
damper such as 75
Ω in series with 0.2 or 1 µF from output to
ground are often useful. These are shown in
Figure 13,
Figure 14, and Figure 16.
DS005516-19
FIGURE 3. LM35 with Decoupling from Capacitive Load
DS005516-20
FIGURE 4. LM35 with R-C Damper
DS005516-5
FIGURE 5. Two-Wire Remote Temperature Sensor
(Grounded Sensor)
DS005516-6
FIGURE 6. Two-Wire Remote Temperature Sensor
(Output Referred to Ground)
DS005516-7
FIGURE 7. Temperature Sensor, Single Supply, −55˚ to
+150˚C
DS005516-8
FIGURE 8. Two-Wire Remote Temperature Sensor
(Output Referred to Ground)
DS005516-9
FIGURE 9. 4-To-20 mA Current Source (0˚C to +100˚C)
www.national.com
7


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