February 2007
rev 1.3
Notebook LCD Panel EMI Reduction IC
Features
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P1707A
the clock source, allowing system wide reduction of EMI of
down stream clock and data dependent signals. The
P1707A 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.
The P1707A 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’.
The P1707A uses the most efficient and optimized
modulation
profile
approved
by
the
FCC
and
is
implemented in a proprietary all digital method.
FCC approved method of EMI attenuation.
Generates a low EMI spread spectrum clock of the
input frequency.
Optimized for frequency range from 60MHz to
175MHz.
Internal loop filter minimizes external components
and board space.
Four selectable spread ranges.
Low inherent Cycle-to-cycle jitter.
3.3V Operating Voltage.
Ultra-low power CMOS design.
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14.85 mA @3.3V, 140MHz
16.69 mA @3.3V, 162MHz
17.78 mA @3.3V, 175MHz
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Supports notebook VGA and other LCD timing
controller applications.
Pinout compatible to ICS MK1707 and Cypress
CY25561/CY25560.
SSON/SBM pin for Spread Spectrum On/Off and
Standby Mode controls.
Available in 8-pin SOIC and TSSOP Packages.
Applications
The P1707A is targeted towards notebook LCD displays,
and other displays using an LVDS interface, PC peripheral
devices, and embedded systems.
Product Description
The P1707A is a versatile spread spectrum frequency
modulator designed specifically for input clock frequencies.
The P1707A reduces electromagnetic interference (EMI) at
Block Diagram
SR0 SR1 SSON/SBM
VDD
PLL
Modulation
CLKIN
Frequency
Divider
Feedback
Divider
Phase
Detector
Loop
Filter
VCO
Output
Divider
ModOUT
VSS
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200, Campbell, CA 95008
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Tel: 408-879-9077
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Fax: 408-879-9018
www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice.
PULSECORE [ PulseCore Semiconductor ]
