October 2003
rev 1.0
LCD Panel EMI Reduction IC
Features
FCC approved method of EMI attenuation.
Provides up to 20dB of EMI suppression.
Generates a low EMI spread spectrum clock of the
input frequency.
Input frequency range: 30MHz to 110MHz.
Optimized for VGA, SVGA, and higher resolution
XGA LCD Panels.
Internal loop filter minimizes external components
and board space.
Six selectable high spread ranges up to ± 2%.
Two selectable modulation rates.
SSON# control pin for spread spectrum enable
and disable options.
Low cycle-to-cycle jitter.
Wide operating range.
16mA output drives.
TTL or CMOS compatible outputs.
Low power CMOS design.
Supports
most
mobile
graphic
accelerator
specifications.
Products available for automotive temperature
range.
(Refer Spread Spectrum Range Selection
Tables)
Available in 8-pin SOIC and TSSOP.
P2040A
implemented in a proprietary all digital method.
The P2040A 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 P2040A is targeted towards digital flat panel
applications for notebook PCs, palm-size PCs, office
automation equipments and LCD monitors.
Product Description
The P2040A is a versatile spread spectrum frequency
modulator designed specifically for digital flat panel
applications.
The
P2040A
reduces
electromagnetic
interference (EMI) at the clock source, allowing system
wide reduction of EMI of down stream clock and data
dependent signals. The P2040A allows significant system
cost savings by reducing the number of circuit board
layers ferrite beads,
regulations.
The P2040A uses the most efficient and optimized
modulation profile approved by the FCC and is
shielding and other passive
components that are traditionally required to pass EMI
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.
PULSECORE [ PulseCore Semiconductor ]
