P1817A Datasheet, PDF (1/7 Pages) Alliance Semiconductor Corporation – Low-Power Mobile VGA EMI Reduction IC

P1817A, P1817B
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Low-Power Mobile VGA EMI
Reduction IC
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.
http://onsemi.com
SOIC−8
S SUFFIX
CASE 751BD
TSSOP−8
T SUFFIX
CASE 948AL
PIN CONFIGURATION
1
CLKIN / XIN
XOUT
VSS
VDD
SR0
REF
SSON / SBM
ModOUT
Applications
(Top View)
The P1817 is targeted towards notebook LCD displays, and other
displays using an LVDS interface, PC peripheral devices, and
embedded systems.
Features
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
• FCC Approved Method of EMI Attenuation
• Generates a Low EMI Spread Spectrum Clock of the Input Frequency
• Optimized for Frequency Range from:
• P1817A – 20 to 32 MHz
• P1817B – 10 to 20 MHz
• Internal Loop Filter Minimizes External Components and Board Space
• Two Selectable Spread Ranges
• Low Inherent Cycle−to−Cycle Jitter
• 3.3 V or 5 V Operating Voltage Range
• TTL or CMOS Compatible Inputs and Outputs
• Ultra−low Power CMOS Design
• 3.17 mA @ 3.3 V, 10 MHz | 6.20 mA @ 5.0 V, 10 MHz
• 4.28 mA @ 3.3 V, 14 MHz | 7.50 mA @ 5.0 V, 14 MHz
• 5.50 mA @ 3.3 V, 20 MHz | 9.50 mA @ 5.0 V, 20 MHz
• 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
• These are Pb−Free Devices
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
© Semiconductor Components Industries, LLC, 2011
1
August, 2011 − Rev. P3
Publication Order Number:
P1817A/D