P2560B Datasheet, PDF (1/6 Pages) Alliance Semiconductor Corporation – Low Frequency EMI Reduction

P2560B
Product Preview
Low Frequency EMI
Reduction
Product Description
The P2560B is a versatile spread spectrum frequency modulator
designed specifically for a wide range of clock frequencies. It reduces
electromagnetic interference (EMI) at the clock source allowing
system−wide reduction of EMI of downstream clock and data
dependent signals. It allows significant system cost savings by
reducing the number of circuit board layers and shielding traditionally
required to pass EMI regulations.
The P2560B 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 results 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 P2560B uses the most efficient and optimized modulation
profile approved by the FCC and is implemented by using a
proprietary all−digital method.
Applications
The P2560B is targeted toward the notebook VGA chip and other
displays using an LVDS interface, PC peripheral devices, and
embedded systems.
Features
• FCC Approved Method of EMI Attenuation
• Generates a Low EMI Spread Spectrum and a Non Spread Reference
Signal of the Input Clock Frequency
• Optimized for Input Frequency Range from 20 to 32 MHz
• Internal Loop Filter Minimizes External Components and Board
Space
• Two Selectable Spread Ranges
• 3.3 V Operating Voltage
• Ultra Low Power CMOS Design: 5.50 mA @ 3.3 V
• Supports Notebook VGA and Other LCD Timing Controller
Applications
• 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.
http://onsemi.com
SOIC−8
S SUFFIX
CASE 751BD
TSSOP−8
T SUFFIX
CASE 948AL
PIN CONFIGURATION
1
XIN / CLKIN
XOUT
VDD
NC
P2560B
VSS
NC
ModOUT
NC
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
© Semiconductor Components Industries, LLC, 2011
1
August, 2011 − Rev. P3
Publication Order Number:
P2560B/D