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ASM3P2853AF-08-ST Datasheet

  • ASM3P2853AF-08-ST

  • Peak EMI Reducing Solution

  • 2705.50KB

  • 8頁

  • ALSC

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December 2004
rev 0.7
Peak EMI Reducing Solution
Features
Generates an EMI optimized clock signal at
output.
Input frequency: 25 MHz.
Frequency outputs:
o
o
USB Clock (48 MHz unmodulated)
50 MHz (modulated), 鹵1% centre spread
ASM3P2853A
shielding that are required to pass EMI regulations. The
ASM3P2853A 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: 39 KHz.
Spread Spectrum ON/OFF control
Supply voltage range 2.5V 鹵 5%.
Available in 8-pin SOIC package.
Commercial Temperature range.
Applications
ASM3P2853A is targeted towards EMI management for
high speed digital applications such as PC peripheral
devices, consumer electronics and embedded controller
systems.
Product Description
The ASM3P2853A is a versatile spread spectrum
frequency
modulator.
The
ASM3P2853A
reduces
electromagnetic interference (EMI) at the clock source.
The ASM3P2853A allows significant system cost savings
by reducing the number of circuit board layers and
Block Diagram
V
DD
PWDNB
XIN
XOUT
Crystal
Oscillator
PLL1
USB Clock
(48 MHz
Unmodulated)
50 MHz
Modulated
SSONB
PLL2
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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