參數資料
| 型號： | P1819GF-08SR |
| 廠商： | ON Semiconductor |
| 文件頁數： | 1/6頁 |
| 文件大小： | 0K |
| 描述： | IC CLK EMI REDUCTION FREQ 8SOIC |
| 標準包裝： | 2,500 |
| 類型： | 扇出配送，頻率調制器，擴展頻譜時鐘發生器 |
| PLL： | 是 |
| 輸入： | 時鐘，晶體 |
| 輸出： | CMOS |
| 電路數： | 1 |
| 比率 - 輸入:輸出： | 1:2 |
| 差分 - 輸入:輸出： | 無/無 |
| 頻率 - 最大： | 40MHz |
| 除法器/乘法器： | 是/無 |
| 電源電壓： | 3 V ~ 3.6 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SOICN |
| 包裝： | 帶卷 (TR) |
P1819
Notebook LCD Panel EMI
Reduction IC
2010 SCILLC.
All rights reserved.
Publication Order Number:
NOVEMBER 2010 – Rev. 3.1
P1819/D
Features
FCC approved method of EMI attenuation.
Provides up to 15dB EMI reduction.
Generates a low EMI Spread Spectrum clock and a
non-spread reference clock of the input frequency.
Optimized for Frequency range from 20 to 40MHz.
Internal loop filter minimizes external components
and board space.
Selectable spread options: Down and Center.
Low Inherent Cycle-to-Cycle jitter.
Two different deviation selections.
ModRate is compliant with ATI M7x VGA spec.
3.3V ± 0.3V Operating Voltage range.
Low power CMOS design.
Supports notebook VGA and other LCD timing
controller applications.
Power Down function for mobile application.
Available in 8-pin SOIC Package.
Product Description
The P1819 is a Versatile Spread Spectrum Frequency
Modulator
designed specifically for input clock
frequencies from 20 to 40MHz. (Refer to Input Frequency
and
Modulation
Rate
Table). The P1819 reduces
electromagnetic interference (EMI) at the clock source,
allowing system wide reduction of EMI of down stream
clock and data dependent signals. The P1819 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 P1819 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 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’.
The P1819 is available in different spread deviation, refer
to Spread Deviation Selection Table.
The P1819 uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
Applications
The P1819 is targeted towards EMI management for
memory and LVDS interfaces in mobile graphic chipsets
and high-speed digital applications such as PC peripheral
devices, consumer electronics, and embedded controller
systems.
Block Diagram
VSS
VDD
ModOUT
XIN / CLKIN
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
VCO
Output
Divider
PLL
SRS
D_C/NC PD#
Crystal
Oscillator
XOUT
REF
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