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Like most micropower circuits, the LM35 has a limited abilityto 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 200W load resistor as
shown in Figure 5, Figure 6 or Figure 8 it is relatively immune
to wiring capacitance because the capacitance forms a bypass
from ground to input, not on the output. However, as
with any linear circuit connected to wires in a hostile environment,
its performance can be affected adversely by intense
electromagnetic sources such as relays, radio transmitters,
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 VIN to ground and a series R-C
damper such as 75W 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
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传感器增益 10mV/°C
安装类型 表面贴装
宽度 3.9mm
封装类型 SOIC N
尺寸 4.9 x 3.9 x 1.45mm
引脚数目 8
最低工作温度 -40°C
最高工作温度 +100 °C
精确度 ±1°C
输出类型 模拟
长度 4.9mm
高度 1.45mm
