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ASM3P2190A-08TT Datasheet

  • ASM3P2190A-08TT

  • Peak Reducing EMI Solution

  • 7頁

  • ALSC

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November 2003
rev 1.0
ASM3P2190A
Peak Reducing EMI Solution
Features
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Generates an EMI optimized clocking
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signal at the output.
Selectable output frequency range.
Single 1.25% or 2.4% down spread
output.
Integrated loop filter components.
Operates with a 3.3V supply.
Low-power CMOS design.
Available in 8-pin SOIC and 8-pin
TSSOP packages.
Key Specifications
Description
Supply voltages
Frequency range
Cycle-to-cycle jitter
Selectable spread percentage
Output duty cycle
Output rise and fall time
Specification
V
DD
= 3.3V 鹵 5%
6 MHz
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30 MHz
325 ps (typical)
-1.25% or 鈥?.4%
40/60% (worst case)
5ns (maximum)
Product Description
The ASM3P2190A is a versatile spread spectrum
frequency modulator designed specifically for a
wide range of clock frequencies. The
ASM3P2190A
reduces
electromagnetic
interference (EMI) at the clock source, allowing
system wide reduction of EMI of down stream
clock and data dependent signals. The
ASM3P2190A allows significant system cost
savings by reducing the number of circuit board
layers and shielding that are traditionally required
to pass EMI regulations.
The ASM3P2190A modulates the output of a
single PLL in order to 鈥渟pread鈥?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.
The ASM3P2190A uses the most efficient and
optimized modulation profile approved by the
FCC and is implemented by using a proprietary
all-digital method.
Simplified Block Diagram
3.3V
X1
X2
Spread spectrum output
(EMI suppressed)
Pin Diagram
CLKIN / X1
NC / X2
GND
SS%
1
2
8
7
NC
FS1
VDD
CLKOUT
Applications
The ASM3P2190A is targeted towards notebook
LCD displays, other displays using an LVDS
interface, PC peripheral devices and embedded
systems.
ASM3P2190A
3
4
6
5
Alliance Semiconductor
2595, Augustine Drive
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Santa Clara
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CA 95054
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Tel 408 855 4900
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Fax 408 855 4999
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www.alsc.com
Notice: The information in this document is subject to change without notice.

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