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I2041AG-08TR датащи(PDF) 3 Page - ON Semiconductor

номер детали I2041AG-08TR
подробное описание детали  Versatile EMI Reduction IC
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производитель  ONSEMI [ON Semiconductor]
домашняя страница  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

I2041AG-08TR датащи(HTML) 3 Page - ON Semiconductor

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P2041A
http://onsemi.com
3
Table 3. SPREAD RANGE SELECTION
SR1
SR0
Spreading Range
Modulation rate
0
0
±1.50%
(Fin/40)*34.72 KHz
0
1
±2.50%
(Fin/40)*34.72 KHz
1
0
±0.50%
(Fin/40)*34.72 KHz
1
1
±1.00%
(Fin/40)*34.72 KHz
Spread Spectrum Selection
Table 3 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 40 MHz:
A spreading selection of SR1=1 and SR0=1 provides a
percentage deviation of
±1.00%* (see Table 3) of Center
Frequency. This results in the frequency on ModOUT being
swept from 40.40 MHz to 39.60 MHz at a modulation rate
of (40/40)*34.72 = 34.72 KHz (see Table 3). This particular
example (see Figure below) given here is a common EMI
reduction method for scanners and has already been
implemented by most of the leading manufacturers.
NOTE: Spreading range selection varies from different system
manufacturers and their designs. The spreading range of
P2041A can be set to ±2.5% when working with certain
scanner model.
Figure 2. P2041A Application Schematic for Flat−Bed Scanner
1
2
3
4
8
7
6
5
Modulated 40 MHz signal with ±1.00%
Deviation and modulation rate of
34.72 KHz. This signal is connected back
to the clock crystal Input pin of the system
ASIC.
Note: The above schematic indicates The
exact setting of this example: Default set-
ting (no connection on pin 3, 7 and 5).
40 MHz
VDD
P2041A
0.1 mF
VSS
SR1
XOUT
XIN / CLK VDD
SR0
ModOUT
SSON


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