P2008A Datasheet, PDF (1/7 Pages) Alliance Semiconductor Corporation – General Purpose EMI Reduction IC

P2008A
General Purpose EMI
Reduction IC
Description
The P2008A is a versatile spread spectrum frequency modulator
designed specifically for digital camera and other digital video and
imaging applications. The P2008A reduces electromagnetic
interference (EMI) at the clock source, allowing system wide
reduction of EMI of down stream clock and data dependent signals.
The P2008A 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 P2008A uses the most efficient and optimized modulation
profile approved by the FCC and is implemented in a proprietary all
digital method.
The P2008A 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.’
Applications
The P2008A is targeted towards cable, xDSL, fax modem, set−top
box, USB controller, DSC, and other embedded systems.
Features
• FCC Approved Method of EMI Attenuation
• Provides up to 15 dB of EMI Suppression
• Generates a 1X or ¹/₂X Low EMI Spread Spectrum Clock of the
Input Frequency
• Input Frequency Range: 4 MHz to 32 MHz
• Internal Loop Filter Minimizes External Components and Board
Space
• Spreading Ranges from ±0.8% to ±3.2%
• SSON# Control Pin for Spread Spectrum Enable and Disable Options
• Low Cycle−to−Cycle Jitter
• 3.3 V Operating Voltage
• Ultra−low Power CMOS Design
• Available in 8−pin SOIC and TSSOP Packages
• These are Pb−Free Devices
http://onsemi.com
SOIC−8
S SUFFIX
CASE 751BD
TSSOP−8
T SUFFIX
CASE 948AL
PIN CONFIGURATION
1
XIN / CLKIN
VDD
XOUT
SR0
DIV2
ModOUT
VSS
SSON#
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
© Semiconductor Components Industries, LLC, 2011
1
August, 2011 − Rev. 3
Publication Order Number:
P2008A/D