P2005A Datasheet, PDF (1/7 Pages) Alliance Semiconductor Corporation – Low Frequency EMI Reduction IC

P2005A, P2005S
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A Low Frequency EMI
Reduction IC
Description
The P2005A/S is a versatile spread spectrum frequency modulator
designed specifically for input clock frequencies from 8 MHz to
32 MHz. Refer to Output Frequency Selections Table. The P2005A/S
can generate an EMI reduced clock from crystal, ceramic resonator, or
system clock. The P2005A/S offers various percentage deviations
ranging from ±0.6% to ±3.0%. Refer to Frequency Deviation
Selections Table. The P2005A/S reduces electromagnetic interference
(EMI) at the clock source, allowing system wide reduction of EMI of
down stream clock and data dependent signals. The P2005A/S 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 P2005A/S uses the most efficient and optimized modulation
profile approved by the FCC and is implemented in a proprietary all
digital method.
The P2005A/S 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 P2005A/S is targeted towards EMI management for high−speed
digital applications such as PC peripheral devices, consumer
electronics and embedded controller systems.
http://onsemi.com
SOIC−8
S SUFFIX
CASE 751BD
TSSOP−8
T SUFFIX
CASE 948AL
PIN CONFIGURATION
1
XIN / CLK
VDD
XOUT
ModOUT
DIV2
SSON#
VSS
SR0
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
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: 8 MHz to 32 MHz
• Internal Loop Filter Minimizes External Components and Board Space
• Frequency Deviation:
• P2005A: ±1% to ±3%
• P2005S: ±0.6% to ±1.8%
• SSON# Control Pin for Spread Spectrum Enable and Disable Options
• Low Cycle−to−Cycle Jitter
• 3.3 V or 5 V Operating Voltage Range
• Ultra−low Power CMOS Design
• 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:
P2005A/D