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參數(shù)資料
| 型號(hào)： | X2040CF-08TT |
| 廠商： | ALLIANCE SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 時(shí)鐘及定時(shí) |
| 英文描述： | LCD Panel EMI Reduction IC |
| 中文描述： | 2040 SERIES, PLL BASED CLOCK DRIVER, 1 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO8 |
| 封裝： | 4.40 MM, ROHS COMPLIANT, TSSOP-8 |
| 文件頁(yè)數(shù)： | 1/9頁(yè) |
| 文件大?。?/td> | 159K |
| 代理商： | X2040CF-08TT |
September 2005
rev 1.4
P2040C
Notice: The information in this document is subject to change without notice.
Alliance Semiconductor
2575 Augustine Drive
Santa Clara, CA
Tel: 408.855.4900
Fax: 408.855.4999
www.alsc.com
LCD Panel EMI Reduction IC
Features
FCC approved method of EMI attenuation.
Provides up to 15dB of EMI suppression
Generates a low EMI spread spectrum clock of the
input frequency
50MHz to 170MHz input frequency range
Optimized for 54MHz, 65MHz, 81MHz, 140MHz,
and 162MHz pixel clock frequencies
Internal loop filter minimizes external components
and board space
8 selectable spread ranges, up to ± 2.2%
SSON# control pin for spread spectrum enable and
disable options
2 selectable modulation rates
Low Cycle-to-cycle jitter
3.3V Operating Voltage
Ultra low power CMOS design
Supports most mobile graphic accelerator and LCD
timing controller specifications
Available in 8 pin SOIC and TSSOP Packages
Product Description
The P2040C is a selectable spread spectrum frequency
modulator designed specifically for digital flat panel
applications. The P2040C reduces electromagnetic
interference (EMI) at the clock source which provides
Block Diagram
system wide reduction of EMI of all clock dependent
signals. The P2040C allows significant system cost
savings by reducing the number of circuit board layers and
shielding that are traditionally required to pass EMI
regulations.
The P2040C uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all-digital method. The
P2040C 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 result in a 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 P2040C is targeted towards digital flat panel
applications for Notebook PCs, Palm-size PCs, Office
Automation Equipments and LCD Monitors.
CLKIN
ModOUT
VSS
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
VCO
Output
Divider
PLL
VDD
SSON#
SR0 SR1 MRA
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