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I2040CG-08SR データシート(PDF) 3 Page - Alliance Semiconductor Corporation

部品番号 I2040CG-08SR
部品情報  LCD Panel EMI Reduction IC
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メーカー  ALSC [Alliance Semiconductor Corporation]
ホームページ  https://www.alliancememory.com
Logo ALSC - Alliance Semiconductor Corporation

I2040CG-08SR データシート(HTML) 3 Page - Alliance Semiconductor Corporation

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September 2005
P2040C
rev 1.4
LCD Panel EMI Reduction IC
3 of 9
Notice: The information in this document is subject to change without notice.
Spread Spectrum Selection
Table 1 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 CLKIN, Pin 1).
Example: P2040C is designed for high resolution flat panel applications and is able to support panel frequencies from 50MHz
to 170MHz. For a 65MHz pixel clock frequency, a spreading selection of MRA=0, SR1=1 and SR0 =1 provides a percentage
deviation of ±1.50% (see Table 1). This result in frequency on ModOUT being swept from 64.03MHz to 65.98MHz at a
modulation rate of 50.77KHz (see Table 1). This particular example (see Figure below) given here is a common EMI reduction
method for notebook LCD panel and has already been implemented by most of the leading OEM and mobile graphic
accelerator manufacturers.
Application Schematic for Mobile LCD Graphics Controllers
`
Modulated 65MHz signal with
±1.5 % deviation and modulation
rate of 50.77KHz. This signal is
connected back to the spread
spectrum input pin (SSIN) of the
graphics accelerator.
1
2
3
4
CLKIN
MRA
SR1
VSS
SR0
5
6
7
8
SSON#
ModOUT
VDD
65MHz from graphics accelerator
+3.3V
0.1µF
P2040C
Digital control for the SS enable
or disable


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