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  ON Semiconductor Electronic Components Datasheet  

3P2183A Datasheet

EMI Reduction

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ASM3P2183A
EMI Reduction IC
Description
The ASM3P2183A is a versatile spread spectrum frequency
modulator designed specifically for a wide range of input clock
frequencies from 6 MHz to 90 MHz. (Refer to Input Frequency and
Modulation Rate Table). The ASM3P2183A can generate an EMI
reduced clock from an OSC or a system generated clock. The
ASM3P2183A offers a Down Spread clock with a percentage
deviation of 1.25% and a Center Spread clock with a percentage
deviation of ± 0.42%.
The ASM3P2183A reduces electromagnetic interference (EMI) at
the clock source, allowing system wide reduction of EMI of down
stream clock and data dependent signals. The ASM3P2183A 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 ASM3P2183A uses the most efficient and optimized
modulation profile approved by the FCC and is implemented in a
proprietary all digital method.
The ASM3P2183A 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 ASM3P2183A is targeted towards EMI management for
memory and LVDS interfaces in mobile graphic chipsets and
highspeed digital applications such as PC peripheral devices,
consumer electronics, and embedded controller systems.
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: 6 MHz to 90 MHz
Internal Loop Filter Minimizes External Components and Board
Space
Selectable Spread Options: Down and Center Spread
2 Spread Frequency Deviation Selections: 1.25% or ± 0.42%
Low Inherent CycletoCycle Jitter
Supply Voltage: 3.3 V ± 0.3 V
Low Power CMOS Design
Supports Notebook VGA and Other LCD Timing Controller
Applications
Products are Available for Industrial Temperature Range
Available in 8pin SOIC and TSSOP Packages
These are PbFree Devices
http://onsemi.com
SOIC8
S SUFFIX
CASE 751BD
TSSOP8
T SUFFIX
CASE 948AL
PIN CONFIGURATION
1
XIN / CLKIN
FS1
XOUT
FS0
VSS
VDD
SS%
ModOUT
(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. 3
Publication Order Number:
ASM3P2183A/D


  ON Semiconductor Electronic Components Datasheet  

3P2183A Datasheet

EMI Reduction

No Preview Available !

FS0 FS1
ASM3P2183A
VDD
SS%
XIN/CLKIN
XOUT
Crystal
Oscillator
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
PLL
VCO
Output
Divider
ModOUT
Table 1. PIN DESCRIPTION
Pin#
Pin Name
Type
1
XIN / CLKIN
I
2
XOUT
I
3
VSS
P
4
SS%
I
5
ModOUT
O
6
VDD
P
7
FS0
I
8
FS1
I
VSS
Figure 1. Block Diagram
Description
Crystal connection or external frequency input. This pin has dual functions. It can be con-
nected to either an external crystal or an external reference clock.
Crystal connection. Input connection for an external crystal. If using an external reference,
this pin must be left unconnected.
Ground to entire chip.
Spread range select. Digital logic input used to select frequency deviation
(Refer to Spread Deviation Selection Table). This pin has an internal pullup resistor.
Spread spectrum low EMI output.
Power supply for the entire chip.
Frequency range select. Digital logic input used to select frequency range
(Refer to Input Frequency and Modulation Rate Table). This pin has an internal
pullup resistor.
Frequency range select. Digital logic input used to select frequency range
(Refer to Input Frequency and Modulation Rate Table). This pin has an internal
pullup resistor.
Table 2. INPUT FREQUENCY AND MODULATION RATE TABLE
FS1 (pin 8)
FS0 (pin 7)
0
0
0
1
1
0
1
1
Frequency Range
6 MHz to 13 MHz
12 MHz to 25 MHz
25 MHz to 50 MHz
50 MHz to 90 MHz
Table 3. SPREAD DEVIATION SELECTION TABLE
SS% (pin 4)
0
1
Spread Deviation (%)
1.25
± 0.42
http://onsemi.com
2


Part Number 3P2183A
Description EMI Reduction
Maker ON Semiconductor
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