FM20 Просмотр технического описания (PDF) - Fairchild Semiconductor

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FM20

Ultra-Low-Power Analog Temperature Sensor

Fairchild Semiconductor 

PRODUCT SPECIFICATION

FM20

In environments that are particularly noisy it may be neces-

sary to add a low-pass filter network to the output of the

device. As shown below, a 1µF capacitor in addition to the

output impedance of the device and a 200Ω series resistor

for a low-pass filter that will pass the slow thermal time con-

stant of the FM20, while filtering the higher frequency noise.

The response time of the FM20 can be affected by this filter

network, therefore values for CFILTER < 1500pF are recom-

mended.

0.1µF

Bypass

Cap

GND

VDD

VOUT

CFILTER

RFILTER

CL

GND

CFILTER

0.1µF

Bypass

Cap

VDD

VOUT

CL

RFILTER

Figure 3. FM20 with Filter Network for Noisy Environments or for Capacitive Loads Greater than 300pF

Table 1. Resistor/Capacitor Combinations for Filter Network

RFILTER

200Ω

470Ω

CFILTER

1µF

0.1µF

680Ω

1000Ω

10kΩ

100kΩ

0.01µF

1000pF

100pF

10pF

REV. 1.0.6 1/9/03

5

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