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I1817A-08TT Arkusz danych(PDF) 1 Page - PulseCore Semiconductor

Numer części I1817A-08TT
Szczegółowy opis  Low-Power Mobile VGA EMI Reduction IC
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Producent  PULSECORE [PulseCore Semiconductor]
Strona internetowa  http://www.onsemi.com/
Logo PULSECORE - PulseCore Semiconductor

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February 2007
P1817A/B
rev 1.1
Notice: The information in this document is subject to change without notice.
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200, Campbell, CA 95008
• Tel: 408-879-9077 • Fax: 408-879-9018
www.pulsecoresemi.com
Low-Power Mobile VGA EMI Reduction IC
Features
FCC approved method of EMI attenuation.
Generates a low EMI spread spectrum clock of the
input frequency.
Optimized for frequency range from 60 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 range.
TTL or CMOS compatible inputs and outputs.
Ultra-low power CMOS design.
3.17mA @3.3V, 10MHz | 6.20mA @5.0V, 10MHz
4.28mA @3.3V, 14MHz | 7.50mA @5.0V, 14MHz
5.50mA @3.3V, 20MHz | 9.50mA @5.0V, 20MHz
Supports notebook VGA and other LCD timing
controller applications.
SSON/SBM pin for Spread Spectrum On/Off
and Standby Mode controls.
Available in 8-pin SOIC and TSSOP.
Product Description
The P1817 is a versatile spread spectrum frequency
modulator designed specifically for input clock frequencies.
The P1817 reduces electromagnetic interference (EMI) at
the clock source, allowing system wide reduction of EMI of
down stream clock and data dependent signals. The P1817
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 P1817 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 P1817 uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
Applications
The P1817 is targeted towards notebook LCD displays,
and other displays using an LVDS interface, PC peripheral
devices, and embedded systems.
Block Diagram
VSS
CLKXIN
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
VCO
Output
Divider
ModOUT
PLL
VDD
SSON
SR0
REF


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