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P1727 Schematic ( PDF Datasheet ) - ON Semiconductor

Teilenummer P1727
Beschreibung Notebook LCD Panel EMI Reduction IC
Hersteller ON Semiconductor
Logo ON Semiconductor Logo 




Gesamt 6 Seiten
P1727 Datasheet, Funktion
P1727
Notebook LCD Panel EMI
Reduction IC
Features
FCC approved method of EMI attenuation
Generates a low EMI spread spectrum of the input
clock frequency
Optimized for frequency range: P1727X: 20MHz to
40MHz
Internal loop filter minimizes external components
and board space
8 different frequency deviations ranging from
±0.625% to –3.50%
Low inherent Cycle-to-cycle jitter
3.3V Operating Voltage
Supports notebook VGA and other LCD timing
controller applications
Available in 8-pin SOIC.
Product Description
The P1727 is a versatile spread spectrum frequency
modulator designed specifically for a wide range of
clock frequencies. The P1727 reduces electromagnetic
interference (EMI) at the clock source, allowing system
wide reduction of EMI of down stream (clock and data
dependent signals). The P1727 allows significant
system cost savings by reducing the number of circuit
board layers and shielding that are traditionally required
to pass EMI regulations.
The P1727 modulates the output of a single PLL in
order to “spread” the bandwidth of a synthesized clock,
thereby decreasing the peak amplitudes of its
harmonics. This result in significantly lower system EMI
compared to the typical narrow band signal produced
by oscillators and most clock generators. Lowering EMI
by increasing a signal’s bandwidth is called spread
spectrum clock generation.
The P1727 uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented by using a proprietary all-digital method.
Applications
The P1727 is targeted towards notebook LCD displays,
other displays using an LVDS interface, PC peripheral
devices and embedded systems.
Block Diagram
PDB
VDD
CLKIN
Frequency
Divider
Feedback
Divider
www.DataSheet4U.com
Modulation
Phase
Detector
Loop
Filter
VSS
©2010 SCILLC. All rights reserved.
JANUARY 2010 – Rev. 1
PLL
VCO
Output
Divider
ModOUT
REFOUT
Publication Order Number:
P1727/D






P1727 Datasheet, Funktion
P1727
Ordering Information
Part number
Marking
Package Configuration
Temperature Range
P1727AF-08SR
ABW
8-PIN SOIC, TAPE & REEL, Green
0°C to +70°C
A “microdot” placed at the end of last row of marking or just below the last row toward the center of package indicates Pb-free.
Licensed under US patent #5,488,627, #6,646,463 and #5,631,920.
Note: This product utilizes US Patent #6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003.
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes
without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular
purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability,
including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be
validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.
SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death
may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and
its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising
out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC
was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. U.S Patent Pending; Timing-Safe
and Active Bead are trademarks of PulseCore Semiconductor, a wholly owned subsidiary of ON Semiconductor. This literature is subject to all applicable
copyright laws and is not for resale in any manner.
www.DataPSUhBeLeItC4AUT.IOcoNmORDERING INFORMATION
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For additional information, please contact your
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