August 2007
rev 1.5
P2042A
LCD Panel EMI Reduction IC
Features
interference (EMI) at the clock source, allowing system
wide reduction of EMI of down stream clock and data
dependent signals. The P2042A allows significant system
cost savings by reducing the number of circuit board
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FCC approved method of EMI attenuation.
Provides up to 15dB of EMI suppression.
Generates a low EMI spread spectrum clock of
the input frequency.
layers ferrite beads,
shielding and other passive
components that are traditionally required to pass EMI
regulations.
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Input frequency range: 30MHz to 110MHz.
Optimized for 32.5MHz, 54MHz, 65MHz and
108MHz pixel clock frequencies.
Internal loop filter minimizes external components
and board space.
The P2042A uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
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Eight selectable high spread ranges up to ±
1.9%.
The P2042A 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’.
SSON# control pin for spread spectrum enable
and disable options.
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Low cycle-to-cycle jitter.
3.3V ± 0.3V operating range.
Low power CMOS design.
Supports most mobile graphic accelerator and
LCD timing controller specifications.
Available in 8-pin SOIC and TSSOP Packages.
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Applications
Product Description
The P2042A is targeted towards digital flat panel
applications for notebook PCs, palm-size PCs, office
automation equipments and LCD monitors.
The P2042A is a versatile spread spectrum frequency
modulator designed specifically for digital flat panel
applications. The P2042A reduces electromagnetic
Block Diagram
VDD
SSON#
SR0 CP1 CP0
PLL
Modulation
CLKIN
Frequency
Divider
Output
Divider
Phase
Detector
Loop
Filter
VCO
Feedback
Divider
ModOUT
VSS
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200, Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018
www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice.