August 2004 ASM3P2183A
rev 1.3
Alliance Semiconductor
2575, Augustine Drive •Santa Clara, CA •Tel: 408.855.4900 •Fax: 408.855.4999 •www.alsc.com
Notice: The information in this document is subject to change without notice.
EMI Reduction IC
Features
FCC approved method of EMI attenuation.
Provides up to 15dB EMI reduction.
Generates a 1X low EMI spread spectrum clock of
the input frequency.
Input frequency range: 6MHz to 103MHz.
Internal loop filter minimizes external components
and board space.
Selectable spread options: Down and Center
Spread
2spread frequency deviation selections:
o-1.25% or ± 0.42%
Low inherent cycle-to-cycle jitter.
3.3V operating voltage range.
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.
Product Description
The ASM3P2183 is a versatile spread spectrum
frequency modulators designed specifically for a wide
range of input clock frequencies from 6MHz to 103MHz.
(Refer 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 high-speed digital applications such as PC
peripheral devices, consumer electronics, and embedded
controller systems.
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Block Diagram
Pin Configuration
VSS
XIN
Crystal
Oscillator
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter VCO Output
Divider
ModOUT
PLL
VDD
SS%
FS0 FS1
XOUT
1
2
3
45
6
7
8
ASM3P2183A
XIN
XOUT
GND
SS% ModOUT
VDD
FS0
FS1
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Pin Description
Pin# Pin Name Type Description
1XIN I
Crystal connection or external frequency input. This pin has dual functions.
It can be connected to either an external crystal or an external reference
clock.
2XOUT O
Connection for an external crystal. If using an external reference, this pin
must be left unconnected.
3GND P Ground to entire chip.
4SS% I
Spread range select. Digital logic input used to select frequency deviation
(Refer Spread Deviation Selection Table). This pin has an internal pull-up
resistor.
5ModOUT O Spread spectrum low EMI output.
6VDD P Power supply for the entire chip (3.3V).
7FS0 I
Frequency range select. Digital logic input used to select frequency range
(Refer Input Frequency and Modulation Rate Table). This pin has an internal
pull-up resistor.
8FS1 I
Frequency range select. Digital logic input used to select frequency range
(Refer Input Frequency and Modulation Rate Table). This pin has an internal
pull-up resistor.
Input Frequency and Modulation Rate Table
FS1 (pin 8) FS0 (pin 7) Frequency Range
0 0 6 MHz to 13 MHz
0 1 12 MHz to 25 MHz
1 0 25 MHz to 50 MHz
1 1 50 MHz to 103 MHz
Spread Deviation Selection Table
SS% (pin 4) Spread Deviation (%)
0 - 1.25
1 ± 0.42
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Absolute Maximum Ratings
Symbol Parameter Rating Unit
VDD, VIN Voltage on any pin with respect to GND -0.5 to + 7.0 V
TSTG Storage temperature -65 to +125 °C
TAOperating temperature 0to 70 °C
Note: These are stress ratings only and functional operation is not implied. Exposure to absolute maximum
ratings for extended periods may affect device reliability.
DC Electrical Characteristics
Symbol Parameter Min Typ Max Unit
VIL Input low voltage GND – 0.3 - 0.8 V
VIHInput high voltage 2.0 - VDD+0.3 V
IIL Input low current - - -35 HA
IIH Input high current - - 35 HA
IXOL XOUT Output low current
(@ 0.4V, VDD = 3.3V) -TBD - mA
IXOH XOUT Output high current
(@ 2.5V, VDD = 3.3V) -TBD - mA
VOL Output low voltage (VDD = 3.3V, IOL = 20mA) - - 0.4 V
VOH Output high voltage (VDD = 3.3V, IOH = 20mA) 2.5 - - V
ICC Dynamic supply current
Normal mode (3.3V and 10pF loading) 8.46 12 17.78 mA
IDD Static supply current
Standby mode 0.6 mA
VDD Operating voltage 2.7 3.3 3.7 V
tON Power up time (first locked clock cycle after power up) - 0.18 - mS
ZOUT Clock out impedance - 50 -
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AC Electrical Characteristics
Symbol Parameter Min Typ Max Unit
fIN Input frequency 6 - 103 MHz
ModOUT Output frequency 6 - 103 MHz
tLH*Output rise time (measured at 0.8V to 2.0V) 1.2 1.32 1.4 ns
tHL*Output fall time (measured at 2.0V to 0.8V) 0.8 0.9 1.0 ns
tJC Jitter (cycle to cycle) - - 200 ps
TDOutput duty cycle 45 50 55 %
* tLH and tHL are measured into a capacitive load of 15pF
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D
EH
D
A
1
A2
A
L
C
B
e
Package Information
8-Pin SOIC
Symbol Dimensions in inches Dimensions in millimeters
Min Max Min Max
A0.057 0.071 1.45 1.80
A1 0.004 0.010 0.10 0.25
A2 0.053 0.069 1.35 1.75
B0.012 0.020 0.31 0.51
C0.004 0.01 0.10 0.25
D0.186 0.202 4.72 5.12
E0.148 0.164 3.75 4.15
e0.050 BSC 1.27 BSC
H0.224 0.248 5.70 6.30
L0.012 0.028 0.30 0.70
0° 8° 0° 8°
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E
H
A
A1
A2
D
B
C
L
e
8-Pin TSSOP
Dimensions in inches Dimensions in millimeters
Symbol Min Max Min Max
A0.047 1.10
A1 0.002 0.006 0.05 0.15
A2 0.031 0.041 0.80 1.05
B0.007 0.012 0.19 0.30
C0.004 0.008 0.09 0.20
D0.114 0.122 2.90 3.10
E0.169 0.177 4.30 4.50
e0.026 BSC 0.65 BSC
H0.244 0.260 6.20 6.60
L0.018 0.030 0.45 0.75
O0° 8° 0° 8°
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Notice: The information in this document is subject to change without notice.
Ordering Information
Ordering Code Package Name Package Type
ASM3P2183A-08ST 8-Pin SOIC Tube
ASM3P2183A-08SR 8-Pin SOIC Tape and Reel
ASM3P2183A-08TT 8-Pin TSSOP Tube
ASM3P2183A-08TR 8-Pin TSSOP Tape and Reel
ASM3P2183AF-08ST 8-Pin SOIC Tube
ASM3P2183AF-08SR 8-Pin SOIC Tape and Reel
ASM3P2183AF-08TT 8-Pin TSSOP Tube
ASM3P2183AF-08TR 8-Pin TSSOP Tape and Reel
Device Ordering Information
ASM3P2183AF-08-TR
Licensed under US patent #5,488,627, #6,646,463 and #5,631,920.
OR - SOT23/T/R ST – SOIC, TUBE
TT – TSSOP, TUBE SR - SOIC, T/R
TR – TSSOP, T/R QR – QFN, T/R
QT - QFN, TUBE VT – TVSOP, TUBE
BT - BGA, TUBE VR – TVSOP, T/R
BR – BGA, T/R JR – SSOP, T/R
JT - SSOP, TUBE
PIN COUNT
Alliance Sem
iconductor Mixed Signal Product
PART NUMBER
LEAD FREE PART
X = Automotive I = Industrial P or n/c = Commercial
1–reserved 6 – power management
2 - Non PLL based 7 – power management
3–EMI Reduction 8 – power management
4–DDR support products 9 – Hi performance
5
–
STD Zero Delay Buffer
0
-
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Notice: The information in this document is subject to change without notice.
©Copyright 2003 Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are
trademarks or registered trademarks of Alliance. All other brand and product names may be the trademarks of their
respective companies. Alliance reserves the right to make changes to this document and its products at any time without
notice. Alliance assumes no responsibility for any errors that may appear in this document. The data contained herein
represents Alliance's best data and/or estimates at the time of issuance. Alliance reserves the right to change or correct this
data at any time, without notice. If the product described herein is under development, significant changes to these
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potential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or
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Alliance Semiconductor Corporation
2575, Augustine Drive,
Santa Clara, CA 95054
Tel# 408-855-4900
Fax: 408-855-4999
www.alsc.com
Copyright © Alliance Semiconductor
All Rights Reserved
Part Number: ASM3P2183A
Document Version: v1.3
Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to Alliance Semiconductor, dated 11-11-2003