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P2040A 데이터시트 PDF




Alliance Semiconductor에서 제조한 전자 부품 P2040A은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 P2040A 자료 제공

부품번호 P2040A 기능
기능 LCD Panel EMI Reduction IC
제조업체 Alliance Semiconductor
로고 Alliance Semiconductor 로고


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P2040A 데이터시트, 핀배열, 회로
October 2005
rev 1.2
LCD Panel EMI Reduction IC
P2040A
Features
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www.DataSheet4U.com
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FCC approved method of EMI attenuation.
Provides up to 20dB of EMI suppression.
Generates a low EMI spread spectrum clock of the
input frequency.
Input frequency range: 30MHz to 100MHz.
Optimized for VGA, SVGA, and higher resolution
XGA LCD Panels.
Internal loop filter minimizes external components
and board space.
Six selectable high spread ranges up to ± 2%.
Two selectable modulation rates.
SSON# control pin for spread spectrum enable and
disable options.
Low cycle-to-cycle jitter.
Wide operating range.
Low power CMOS design.
Supports most mobile graphic accelerator
specifications.
Products available for automotive temperature
range. (Refer Spread Spectrum Range Selection
Tables)
Available in 8-pin SOIC and TSSOP Packages.
Product Description
The P2040A is a versatile spread spectrum frequency
modulator designed specifically for digital flat panel
applications. The P2040A reduces electromagnetic
interference (EMI) at the clock source, allowing system
wide reduction of EMI of down stream clock and data
dependent signals. The P2040A allows significant system
cost savings by reducing the number of circuit board
layers ferrite beads, shielding and other passive
components that are traditionally required to pass EMI
regulations.
The P2040A uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
The P2040A modulates the output of a single PLL in
order to “spread” the bandwidth of a synthesized clock,
and more importantly, decreases the peak amplitudes of
its harmonics. This results in significantly lower system
EMI compared to the typical narrow band signal produced
by oscillators and most frequency generators. Lowering
EMI by increasing a signal’s bandwidth is called ‘spread
spectrum clock generation’.
Applications
The P2040A is targeted towards digital flat panel
applications for notebook PCs, palm-size PCs, office
automation equipments and LCD monitors.
Block Diagram
SR0 SR1 MRA SSON#
VDD
CLKIN
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
PLL
VCO
Output
Divider
ModOUT
VSS
Alliance Semiconductor
2575 Augustine Drive Santa Clara, CA Tel: 408.855.4900 Fax: 408.855.4999 www.alsc.com
Notice: The information in this document is subject to change without notice.




P2040A pdf, 반도체, 판매, 대치품
October 2005
P2040A
rev 1.2
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
www.DataSheet4U.com
65MHz from graphics accelerator
1 CLKIN
VDD 8
2 MRA P2040A SR0
3 SR1
ModOUT
7
6
4 VSS
SSON# 5
0.1µF
+3.3V
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.
Digital control for the SS enable
or disable
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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P2040A 전자부품, 판매, 대치품
October 2005
rev 1.2
8-lead Thin Shrunk Small Outline Package (4.40-MM Body)
P2040A
www.DataSheet4U.com
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D
e
B
Symbol
A
A1
A2
B
c
D
E
e
H
L
θ
E
A2
A
θ
C
A1
L
Dimensions
Inches
Millimeters
Min Max Min Max
0.043
1.10
0.002
0.006
0.05
0.15
0.033
0.037
0.85
0.95
0.008
0.012
0.19
0.30
0.004
0.008
0.09
0.20
0.114
0.122
2.90
3.10
0.169
0.177
4.30
4.50
0.026 BSC
0.65 BSC
0.252 BSC
6.40 BSC
0.020
0.028
0.50
0.70
0° 8° 0° 8°
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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