ALSC ASM3P2184A Lcd panel emi reduction ic Datasheet

November 2003
ASM3P2184A
rev 1.0
LCD Panel EMI Reduction IC
Features
The ASM3P2184A reduces electromagnetic interference
ƒ
FCC approved method of EMI attenuation.
ƒ
Provides up to 15dB EMI reduction.
ƒ
Generates a 1X low EMI spread spectrum clock of
(EMI) at the clock source, allowing system wide reduction
the input frequency.
Input frequency range: 6MHz to 70 MHz.
ƒ
Internal loop filter minimizes external components
and board space.
Spread option: Center Spread.
ƒ
2 spread frequency deviation selections:
o
down stream clock and data dependent
signals. The ASM3P2184A allows significant system cost
savings by reducing the number of circuit board layers
ƒ
ƒ
of EMI of
ferrite beads, shielding and other passive components
that are traditionally required to pass EMI regulations.
The ASM3P2184A uses the most efficient and optimized
modulation profile approved by the FCC and is
±0.625% or ±1.875%
implemented in a proprietary all digital method.
ƒ
Low inherent cycle-to-cycle jitter.
ƒ
3.3V operating voltage range.
ƒ
Low power CMOS design.
ƒ
Supports notebook VGA and other LCD timing
The ASM3P2184A modulates the output of a single PLL
controller applications.
ƒ
Product available for industrial temperature range.
ƒ
Available in 8-pin SOIC and TSSOP.
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
Product Description
spectrum clock generation’.
The ASM3P2184A is a versatile spread spectrum
frequency modulators designed specifically for a wide
Applications
range of input clock frequencies from 6MHz to 70MHz.
(Refer Input Frequency and Modulation Rate Table). The
The ASM3P2184A is targeted towards EMI management
ASM3P2184A can generate an EMI reduced clock from
for memory and LVDS interfaces in mobile graphic
an
The
chipsets and high-speed digital applications such as PC
with 2
peripheral devices, consumer electronics, and embedded
OSC
or
a
system
generated
clock.
ASM3P2184A offers a Center Spread clock
percentage deviations; ±0.625% and ±1.675%.
controller systems.
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.
November 2003
ASM3P2184A
rev 1.0
Block Diagram
FS0
VDD
SS%
FS1
PLL
Modulation
XIN
Crystal
Oscillator
XOUT
Frequency
Divider
Phase
Detector
Feedback
Divider
Loop
Filter
VCO
Output
Divider
MODOUT
VSS
Pin Configuration
XIN
1
XOUT
2
8
FS1
7
FS0
ASM3P2184A
GND
3
6
VDD
SS%
4
5
ModOUT
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
2 of 9
November 2003
ASM3P2184A
rev 1.0
Pin Description
Pin#
Pin Name
Type
Description
1
XIN
I
2
XOUT
I
3
GND
P
Ground to entire chip.
4
SS%
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.
5
ModOUT
O
Spread spectrum low EMI output.
6
VDD
P
Power supply for the entire chip (3.3V).
7
FS0
I
8
FS1
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.
Crystal connection. Input connection for an external crystal. If using an
external reference, this pin must be left unconnected.
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.
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
18 MHz to 35 MHz
1
1
40 MHz to 70 MHz
Spread Deviation Selection Table
Part Number
ASM3P2184A
SS% (pin 4)
Spread Deviation (%)
0
± 0.625
1
± 1.875
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
3 of 9
November 2003
ASM3P2184A
rev 1.0
Absolute Maximum Ratings
Symbol
VDD, VIN
Parameter
Voltage on any pin with respect to GND
Rating
Unit
-0.5 to + 7.0
V
TSTG
Storage temperature
-65 to +125
°C
TA
Operating temperature
0 to 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
VIH
Input high voltage
2.0
-
VDD + 0.3
V
IIL
Input low current
-
-
-35
µA
IIH
Input high current
-
-
35
µA
-
TBD
-
mA
-
TBD
-
mA
IXOL
IXOH
XOUT Output low current
(@ 0.4V, VDD = 3.3V)
XOUT Output high current
(@ 2.5V, VDD = 3.3V)
VOL
Output low voltage (VDD = 3.3V, IOL = 20mA)
-
-
0.4
V
VOH
Output high voltage (VDD = 3.3V, IOH = 20mA)
2.5
-
-
V
8.46
12
17.78
mA
ICC
IDD
Dynamic supply current
Normal mode (3.3V and 10pF loading)
Static supply current
Standby mode
VDD
Operating voltage
tON
ZOUT
0.6
mA
2.7
3.3
3.7
V
Power up time (first locked clock cycle after power up)
-
0.18
-
mS
Clock out impedance
-
50
-
Ω
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
4 of 9
November 2003
ASM3P2184A
rev 1.0
AC Electrical Characteristics
Symbol
Parameter
Min
Typ
Max
Unit
XIN
Input frequency
6
-
70
MHz
ModOUT
Output frequency
6
-
70
MHz
tLH*
Output rise time (measured at 0.8V to 2.0V)
0.7
0.9
1.1
ns
tHL*
Output fall time (measured at 2.0V to 0.8V)
0.6
0.8
1.0
ns
tJC
Jitter (cycle to cycle)
-
-
200
ps
TD
Output duty cycle
45
50
55
%
tLH and tHL are measured into a capacitive load of 15pF
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
5 of 9
November 2003
ASM3P2184A
rev 1.0
Package Information
8-Pin SOIC
H
E
D
A2
A
C
A1
D
θ
e
L
B
Symbol
Dimensions in inches Dimensions in millimeters
Min
Max
Min
Max
A
0.057
0.071
1.45
1.80
A1
0.004
0.010
0.10
0.25
A2
0.053
0.069
1.35
1.75
B
0.012
0.020
0.31
0.51
C
0.004
0.01
0.10
0.25
D
0.186
0.202
4.72
5.12
E
0.148
0.164
3.75
4.15
e
0.050 BSC
1.27 BSC
H
0.224
0.248
5.70
6.30
L
0.012
0.028
0.30
0.70
0°
8°
0°
8°
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
6 of 9
November 2003
ASM3P2184A
rev 1.0
8-Pin TSSOP
H
E
D
A2
A
C
θ
e
A1
L
B
Dimensions in inches Dimensions in millimeters
Symbol
Min
A
0.047
A1
0.002
0.006
0.05
0.15
A2
0.031
0.041
0.80
1.05
B
0.007
0.012
0.19
0.30
C
0.004
0.008
0.09
0.20
D
0.114
0.122
2.90
3.10
E
0.169
0.177
4.30
4.50
e
Max
Min
Max
1.10
0.026 BSC
0.65 BSC
H
0.244
0.260
6.20
6.60
L
0.018
0.030
0.45
0.75
θ
0°
8°
0°
8°
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
7 of 9
November 2003
ASM3P2184A
rev 1.0
Ordering Information
Ordering Code
Package Name
Package Type
ASM3P2184A-08ST
8-Pin SOIC
Tube
ASM3P2184A-08SR
8-Pin SOIC
Tape and Reel
ASM3P2184A-08TT
8-Pin TSSOP
Tube
ASM3P2184A-08TR
8-Pin TSSOP
Tape and Reel
A S M 3 P 2 1 8 4 A - 0 8 - T R
OR - SOT23/T/R
TT – TSSOP, TUBE
TR – TSSOP, T/R
QT - QFN, TUBE
BT - BGA, TUBE
BR – BGA, T/R
ST – SOIC, TUBE
SR - SOIC, T/R
QR – QFN, T/R
VT – TVSOP, TUBE
VR – TVSOP, T/R
JR – SSOP, T/R
JT - SSOP, TUBE
PIN COUNT
PART NUMBER
X = Automotive
I = Industrial
1 – reserved
2 - Non PLL based
3 – EMI Reduction
4 – DDR support products
5 – STD Zero Delay Buffer
P or n/c = Commercial
6 – power management
7 – power management
8 – power management
9 – Hi performance
0 - reserved
Alliance Semiconductor Mixed Signal Product
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
8 of 9
November 2003
ASM3P2184A
rev 1.0
Alliance Semiconductor Corporation
2595, Augustine Drive,
Santa Clara, CA 95054
Tel# 408-855-4900
Fax: 408-855-4999
www.alsc.com
Copyright © Alliance Semiconductor
All Rights Reserved
Preliminary Information
Part Number: ASM3P2184A
Document Version: v1.0
© 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
specifications are possible. The information in this product data sheet is intended to be general descriptive information for
potential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or
customer. Alliance does not assume any responsibility or liability arising out of the application or use of any product
described herein, and disclaims any express or implied warranties related to the sale and/or use of Alliance products
including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any intellectual
property rights, except as express agreed to in Alliance's Terms and Conditions of Sale (which are available from Alliance).
All sales of Alliance products are made exclusively according to Alliance's Terms and Conditions of Sale. The purchase of
products from Alliance does not convey a license under any patent rights, copyrights; mask works rights, trademarks, or any
other intellectual property rights of Alliance or third parties. Alliance does not authorize its products for use as critical
components in life-supporting systems where a malfunction or failure may reasonably be expected to result in significant
injury to the user, and the inclusion of Alliance products in such life-supporting systems implies that the manufacturer
assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use.
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
9 of 9
Similar pages