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ASM3P2111AF-08SR Datasheet

  • ASM3P2111AF-08SR

  • Peak EMI Reducing Solution

  • 8頁

  • ALSC

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March 2005
rev 1.3
Peak EMI Reducing Solution
Features
Generates an EMI optimized clocking signal at
output.
Input frequency 鈥?25 MHz.
Frequency outputs:
o
o
o
60 MHz (unmodulated)
2 x 48 MHz (unmodulated)
66.6 MHz (modulated) -1.7% down spread
ASM3P2111A
The ASM3P2111A allows significant system cost savings
by reducing the number of circuit board layers and
shielding that are required to pass EMI regulations. The
ASM3P2111A modulates the output of PLL in order to
spread the bandwidth of a synthesized clock, thereby
decreasing 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 clock generators. Lowering EMI by increasing a
signal鈥檚 bandwidth is called spread spectrum clock
generation.
Modulation rate: 30 KHz.
Supply voltage range: 3.3V 鹵 0.3V.
Available in 8-pin SOIC Package.
Commercial and Industrial Temperature range.
Applications
ASM3P2111A is targeted towards EMI management for
high speed digital applications such as PC peripheral
devices, consumer electronics and embedded controller
systems.
Product Description
The ASM3P2111A is a versatile spread spectrum
frequency
modulator.
The
ASM3P2111A
reduces
electromagnetic interference (EMI) at the clock source.
Block Diagram
V
DD
XIN /CLKIN
XOUT
60 MHz
Crystal
Oscillator
PLL1
48 MHz_1
48 MHz_2
48 MHz_1
PLL2
66.6 MHz
Modulated
V
SS
Alliance Semiconductor
2575 Augustine Drive
鈥?/div>
Santa Clara CA
鈥?/div>
Tel: 408-855-4900
鈥?/div>
Fax: 408-855-4999
鈥?/div>
www.alsc.com

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