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I2010AF-08TT データシート(PDF) 4 Page - ON Semiconductor

部品番号 I2010AF-08TT
部品情報  Low Frequency EMI Reduction IC
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メーカー  ONSEMI [ON Semiconductor]
ホームページ  http://www.onsemi.com
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I2010AF-08TT データシート(HTML) 4 Page - ON Semiconductor

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P2010A
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4
Spread Spectrum Selection
Table 5 illustrates the possible spread spectrum options.
The optimal setting should minimize system EMI to the
fullest without affecting system performance. The spreading
is described as a percentage deviation of the center
frequency.
(Note: The center frequency is the frequency of the external
reference input on XIN / CLK, Pin 1).
Example of a Typical Printer or Scanner Application
that Operates on a Clock Frequency of 16 MHz:
A spreading selection of FS0=1 and SR0=1 provides a
percentage deviation of
±2.50%* (see Table 5) of Center
Frequency. This results in the frequency on ModOUT being
swept from 16.40 MHz to 15.60 MHz at a modulation rate
of 33.33 KHz (see Table 5). This particular example (see
Figure 2 below) given here is a common EMI reduction
method for scanner, printer or embedded applications and
has already been adopted by most of the leading
manufacturers.
NOTE: Spreading range selection varies from different system
manufacturers and their designs.
Figure 2. P2010A Application Schematic for Flat−Bed Scanner
P2010A
Connected to CLK input pin
of the system.
VDD
0.1 mF
16 MHz Crystal Input
VDD
SR0
ModOUT
SSON
XIN / CLK
XOUT
FS0
VSS
1
2
3
4
8
7
6
5


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