Datasheet > X2040AG-08-TT

X2040AG-08-TT

更新时间： 2022-12-18 08:00:19

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LCD Panel EMI Reduction IC

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X2040AG-08-TT 数据手册

November 2006

P2040A

rev 1.3

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 (F_IN) clock speed. A spreading selection of MRA=0, SR1=1 and SR0=0 provides a percentage

deviation of ±0.75% from F_IN. 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

+3.3V

Modulated 65MHz signal with

65MHz from graphics accelerator

±0.75 deviation and modulation

VDD

SR0

CLKIN

rate of 56.24KHz. This signal is

connected back to the spread

spectrum input pin (SSIN) of the

graphics accelerator.

MRA

SR1

VSS

0.1µF

ModOUT

SSON#

P2040A

Digital control for the SS enable

or disable

LCD Panel EMI Reduction IC

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