LCD Panel EMI Reduction IC
FCC approved method of EMI attenuation.
Provides up to 15dB EMI reduction.
Generates a 1X low EMI spread spectrum clock of
the input frequency.
Input frequency range: 25MHz to 210 MHz.
Internal loop filter minimizes external components
and board space.
4 spread frequency deviation selections: ± 0.13%
The ASM3P2182A reduces electromagnetic interference
(EMI) at the clock source, allowing system wide reduction
of EMI of down stream clock and data dependent
signals. The ASM3P2182A 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.
to ± 1.24%.
Low inherent cycle-to-cycle jitter.
3.3V operating voltage range.
TTL or CMOS compatible inputs and outputs.
The ASM3P2182A uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
Low power CMOS design.
Supports notebook VGA and other LCD timing
Products are available for industrial temperature
Available in 8-pin SOIC and TSSOP.
The ASM3P2182A 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
The ASM3P2182A is a versatile spread spectrum
EMI by increasing a signal’s bandwidth is called ‘spread
spectrum clock generation’.
frequency modulator designed specifically for a wide
range of input clock frequencies from 25MHz to 210MHz.
(Refer Input Frequency and Modulation Rate Table). The
ASM3P2182A can generate an EMI reduced clock from
an OSC or a system generated clock. The ASM3P2182A
offers a Center Spread clock and with a percentage
deviation from ± 0.13% or ± 1.24%.
The ASM3P2182A is targeted towards EMI management
for memory and LVDS interfaces in mobile graphic
chipsets and high-speed digital applications such as PC
peripheral devices, consumer electronics, and embedded
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.