ASM3P2182A_11 Datasheet, PDF (1/6 Pages) ON Semiconductor – LCD Panel EMI Reduction IC

ASM3P2182A
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LCD Panel EMI Reduction IC
Description
The ASM3P2182A is a versatile spread spectrum frequency
modulator designed specifically for a wide range of input clock
frequencies from 25 MHz to 210 MHz. (Refer to Input Frequency and
Modulation Rate Table). The ASM3P2182A can generate an EMI
reduced clock from an OSC or a system generated clock. The
ASM3P2182A offers a Center Spread clock and with a percentage
deviation from ± 0.13% or ± 1.24%.
The ASM3P2182A reduces electromagnetic interference (EMI) at
the clock source, allowing system wide reduction of EMI of down
stream clock and data dependent signals. The ASM3P2182A 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 ASM3P2182A uses the most efficient and optimized
modulation profile approved by the FCC and is implemented in a
proprietary all digital method.
The ASM3P2182A 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.’
http://onsemi.com
SOIC−8
S SUFFIX
CASE 751BD
TSSOP−8
T SUFFIX
CASE 948AL
PIN CONFIGURATION
1
CLKIN
FS1
GND
FS0
S1
VDD
S0
ModOUT
(Top View)
Applications
The ASM3P2182A is targeted towards EMI management for
memory and LVDS interfaces in mobile graphic chipsets and
high−speed digital applications such as PC peripheral devices,
consumer electronics, and embedded controller systems.
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
Features
• FCC Approved Method of EMI Attenuation
• Provides up to 15 dB EMI Reduction
• Generates a 1X Low EMI Spread Spectrum Clock of the Input Frequency
• Input Frequency Range: 25 MHz to 210 MHz
• Internal Loop Filter Minimizes External Components and Board Space
• Center Spread
• 4 Spread Frequency Deviation Selections: ± 0.13% to ± 1.24%
• Low Inherent Cycle−to−Cycle Jitter
• 3.3 V Operating Voltage
• TTL or CMOS Compatible Inputs and Outputs
• Low Power CMOS Design
• Supports Notebook VGA and Other LCD Timing Controller Applications
• Products are Available for Industrial Temperature Range
• Available in 8−pin SOIC and TSSOP Packages
• 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:
ASM3P2182A/D