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P2040C Datasheet(PDF) 3 Page - PulseCore Semiconductor

Part No. P2040C
Description  LCD Panel EMI Reduction IC
Download  9 Pages
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Maker  PULSECORE [PulseCore Semiconductor]
Homepage  http://www.onsemi.com/
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P2040C Datasheet(HTML) 3 Page - PulseCore Semiconductor

   
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November 2006
P2040C
rev 1.6
LCD Panel EMI Reduction IC
3 of 9
Notice: The information in this document is subject to change without notice.
1
2
3
4
CLKIN
MRA
SR1
VSS
SR0
5
6
7
8
SSON#
ModOUT
VDD
P2040C
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 173MHz. 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.
65MHz from graphics accelerator
+3.3V
0.1µF
Digital control for the SS enable
or disable


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