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X2040CF-08SR

更新时间： 2024-01-17 23:14:35

品牌	Logo	应用领域
PULSECORE		/
页数	文件大小	规格书
9页	156K
描述
LCD Panel EMI Reduction IC

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数据手册

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X2040CF-08SR 数据手册

November 2006

rev 1.6

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

+3.3V

Modulated 65MHz signal with

65MHz from graphics accelerator

±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.

CLKIN

VDD

SR0

MRA

SR1

VSS

0.1µF

ModOUT

SSON#

Digital control for the SS enable

or disable

P2040C

LCD Panel EMI Reduction IC

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