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P2040A Datasheet(PDF) 4 Page - PulseCore Semiconductor

Part No. P2040A
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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P2040A Datasheet(HTML) 4 Page - PulseCore Semiconductor

   
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November 2006
P2040A
rev 1.3
LCD Panel EMI Reduction IC
4 of 9
Notice: The information in this document is subject to change without notice.
Spread Spectrum Selection
The Modulation Selection Table defines 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, pin1).
For example, P2040A is designed for high-resolution, flat panel applications and is able to support an XGA (1024 x 768)
flat panel operating at 65MHz (FIN) clock speed. A spreading selection of MRA=0, SR1=1 and SR0=0 provides a percentage
deviation of ±0.75% from FIN. This results in the frequency on ModOUT being swept from 64.51MHz to 65.49MHz at a
modulation rate of 56.24KHz. Refer Modulation Selection Table. The example in the following illustration is a common EMI
reduction method for a 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
±0.75 deviation and modulation
rate of 56.24KHz. 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
P2040A
Digital control for the SS enable
or disable


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