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參數(shù)資料
| 型號(hào)： | L2042A-08TR |
| 廠商： | ALLIANCE SEMICONDUCTOR CORP |
| 元件分類： | 時(shí)鐘及定時(shí) |
| 英文描述： | 2.5V LCD Panel Reduction IC |
| 中文描述： | PLL BASED CLOCK DRIVER, 1 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO8 |
| 封裝： | TSSOP-8 |
| 文件頁(yè)數(shù)： | 3/10頁(yè) |
| 文件大小： | 428K |
| 代理商： | L2042A-08TR |
October 2003
rev 1.0
Spread Spectrum
The
Modulation Selection Table
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, Pin1).
Example:
The L2042A is designed for high-resolution flat panel applications and is able to support panel frequencies from
30 to 75 MHz. For a 65MHz pixel clock frequency, a spreading selection of CP0=0 and CP1=1 and SR0=1 gives
a percentage deviation of TBD%.
Refer Modulation Selection Table.
This results in frequency on ModOUT being
swept from TBD to TBD MHz. 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.
L2042A
2.5V LCD Panel EMI Reduction IC
3 of 10
1
2
3
4
CLKIN
CP0
CP1
VSS
SR0
5
6
7
8
SSON#
ModOUT
VDD
L2042A
65 MHz from Graphics Accelerator
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
VDD
0.1μF
Digital control for SS
Enable or Disable
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相關(guān)代理商/技術(shù)參數(shù) |
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| L2042A-08TT | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:2.5V LCD Panel Reduction IC |
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| L-20434 | 制造商:RHOMBUS-IND 制造商全稱:Rhombus Industries Inc. 功能描述:SMPS Inductor |
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