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參數(shù)資料
| 型號： | ASM3P5811A-TR |
| 廠商： | ALLIANCE SEMICONDUCTOR CORP |
| 元件分類： | 時(shí)鐘產(chǎn)生/分配 |
| 英文描述： | 20 MHz, OTHER CLOCK GENERATOR, PDSO8 |
| 封裝： | TSSOP-8 |
| 文件頁數(shù)： | 1/7頁 |
| 文件大?。?/td> | 227K |
| 代理商： | ASM3P5811A-TR |
October 2003
ASM3P5811A
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: 10MHz – 20MHz.
Internal loop filter minimizes external components
and board space.
Frequency deviation: -1.5%
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, 16.6MHz
Pinout
compatible
with
Cypress
CY25811.
Products are available for industrial temperature
range.
Available in 8-pin SOIC and TSSOP.
Product Description
The ASM3P5811A is a versatile spread spectrum
frequency modulator designed specifically for input clock
frequencies in the range of 10MHz - 20MHz. The
ASM3P5811A can generate an EMI reduced clock from
crystal, ceramic resonator, or system clock. The
ASM3P5811A offers a percentage deviation of –1.5%.
The ASM3P5811A reduces electromagnetic interference
(EMI) at the clock source, allowing system wide reduction
of EMI of
down stream clock and data dependent
signals. The ASM3P5811A 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 ASM3P5811A uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
The ASM3P5811A 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 ASM3P5811A 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
XOUT
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