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參數(shù)資料
| 型號(hào)： | ASM3P2821B-ST |
| 廠商： | ALLIANCE SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | 27 MHz, OTHER CLOCK GENERATOR, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 1/7頁 |
| 文件大?。?/td> | 174K |
| 代理商： | ASM3P2821B-ST |
October 2003
ASM3P2821B
rev 1.0
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.
Features
FCC approved method of EMI attenuation.
Generates a 1X low EMI spread spectrum clock of
the input frequency.
Input frequency range: 15MHz – 27MHz.
Internal loop filter minimizes external components
and board space.
Frequency deviation: -2.5%
Low inherent cycle-to-cycle jitter.
3.3V operating voltage.
TTL or CMOS compatible inputs and outputs.
Ultra-low power CMOS design.
o
TBD mA @ 3.3V, 24MHz
Pinout
compatible
with
Cypress
CY25811.
Products are available for industrial temperature
range.
Available in 8-pin SOIC and TSSOP.
Product Description
The ASM3P2821B is a versatile spread spectrum
frequency modulator designed specifically for input clock
frequencies in the range of 15MHz - 27MHz. The
ASM3P2821B can generate an EMI reduced clock from a
ceramic resonator or system clock. The ASM3P2821B
offers a percentage deviation of –2.5%.
The ASM3P2821B reduces electromagnetic interference
(EMI) at the clock source, allowing system wide reduction
of EMI of
down stream clock and data dependent
signals. The ASM3P2821B 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 ASM3P2821B uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
The ASM3P2821B 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 ASM3P2821B is targeted towards EMI management
for high speed digital applications such as PC peripheral
devices, consumer electronics and embedded controller
systems.
Block Diagram
VSS
XIN
Crystal
Oscillator
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
VCO
Output
Divider
MODOUT
PLL
VDD
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| ASM3P2853A | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Peak EMI Reducing Solution |
| ASM3P2853AF-08SR | 制造商:PULSECORE 制造商全稱:PulseCore Semiconductor 功能描述:Peak EMI Reducing Solution |
| ASM3P2853AF-08-SR | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Peak EMI Reducing Solution |
| ASM3P2853AF-08ST | 制造商:PULSECORE 制造商全稱:PulseCore Semiconductor 功能描述:Peak EMI Reducing Solution |
| ASM3P2853AF-08-ST | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Peak EMI Reducing Solution |
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