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參數(shù)資料
| 型號： | ASM3P2108AF-08-ST |
| 廠商： | ALLIANCE SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | Peak EMI Reducing Solution |
| 中文描述： | 45 MHz, OTHER CLOCK GENERATOR, PDSO8 |
| 封裝： | LEAD FREE, SOIC-8 |
| 文件頁數(shù)： | 1/7頁 |
| 文件大?。?/td> | 326K |
| 代理商： | ASM3P2108AF-08-ST |
July 2005
rev 0.3
ASM3P2108A
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.
Peak EMI Reducing Solution
Features
FCC approved method of EMI attenuation.
Generates a 1X low EMI spread spectrum clock of
the input frequency.
Input frequency range: 25MHz to 45MHz.
Internal loop filter minimizes external components
and board space.
Frequency deviation: - 1.3%( Typ) @32MHz.
Low cycle-to-cycle jitter.
5.0V ± 5% operating voltage range.
TTL or CMOS compatible outputs.
Available in 8-pin SOIC and TSSOP Packages.
Product Description
The ASM3P2108A is a versatile spread spectrum
frequency modulator designed specifically for input clock
frequencies from 25MHz to 45MHz. The ASM3P2108A
can generate an EMI reduced clock from crystal, ceramic
resonator, or system clock.
The ASM3P2108A reduces electromagnetic interference
(EMI) at the clock source, allowing system wide reduction
of EMI of down stream clock and data dependent
signals. The ASM3P2108A allows significant system cost
Block Diagram
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 ASM3P2108A uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
The ASM3P2108A 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 ASM3P2108A is targeted towards EMI management
for high speed digital applications such as PC peripheral
devices, consumer electronics and embedded controller
systems.
GND
XIN
XOUT
Crystal
Oscillator
Divider
Divider
Frequency
Feedback
Modulation
Phase
Detector
Loop
Filter
VCO
Output
Divider
CLOCKOUT
PLL
V
DD
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ASM3P2108AF-08-TR | Peak EMI Reducing Solution |
| ASM3P2108AF-08-TT | Peak EMI Reducing Solution |
| ASM3P2108AG-08-SR | CA-BAYONET |
| ASM3P2108AG-08-ST | Peak EMI Reducing Solution |
| ASM3P2108AG-08-TR | Peak EMI Reducing Solution |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ASM3P2108AF-08-TR | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Peak EMI Reducing Solution |
| ASM3P2108AF-08-TT | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Peak EMI Reducing Solution |
| ASM3P2108AG-08-SR | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Peak EMI Reducing Solution |
| ASM3P2108AG-08-ST | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Peak EMI Reducing Solution |
| ASM3P2108AG-08-TR | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Peak EMI Reducing Solution |
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