ALSC I2040AF-08-SR Lcd panel emi reduction ic Datasheet

P2040A
October 2005
rev 1.2
LCD Panel EMI Reduction IC
Features
applications.
The
P2040A
reduces
electromagnetic
interference (EMI) at the clock source, allowing system
ƒ
FCC approved method of EMI attenuation.
wide reduction of EMI of
down stream clock and data
ƒ
Provides up to 20dB of EMI suppression.
dependent signals. The P2040A allows significant system
ƒ
Generates a low EMI spread spectrum clock of the
cost savings by reducing the number of circuit board
input frequency.
layers ferrite beads,
ƒ
Input frequency range: 30MHz to 100MHz.
components that are traditionally required to pass EMI
ƒ
Optimized for VGA, SVGA, and higher resolution
regulations.
shielding and other passive
XGA LCD Panels.
Internal loop filter minimizes external components
The P2040A uses the most efficient and optimized
and board space.
modulation
ƒ
Six selectable high spread ranges up to ± 2%.
implemented in a proprietary all digital method.
ƒ
Two selectable modulation rates.
ƒ
SSON# control pin for spread spectrum enable and
ƒ
disable options.
ƒ
Low cycle-to-cycle jitter.
ƒ
Wide operating range.
ƒ
Low power CMOS design.
ƒ
Supports
most
by
the
FCC
and
is
The P2040A modulates the output of a single PLL in
order to “spread” the bandwidth of a synthesized clock,
its harmonics. This results in significantly lower system
EMI compared to the typical narrow band signal produced
mobile
graphic
accelerator
Products available for automotive temperature
range. (Refer Spread Spectrum Range Selection
Tables)
ƒ
approved
and more importantly, decreases the peak amplitudes of
specifications.
ƒ
profile
Available in 8-pin SOIC and TSSOP Packages.
by oscillators and most frequency generators. Lowering
EMI by increasing a signal’s bandwidth is called ‘spread
spectrum clock generation’.
Applications
The P2040A is targeted towards digital flat panel
applications for notebook PCs, palm-size PCs, office
Product Description
The P2040A is a versatile spread spectrum frequency
automation equipments and LCD monitors.
modulator designed specifically for digital flat panel
Block Diagram
SR0 SR1 MRA SSON#
VDD
PLL
Modulation
CLKIN
Frequency
Divider
Feedback
Divider
Phase
Detector
Loop
Filter
VCO
Output
Divider
ModOUT
VSS
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.
P2040A
October 2005
rev 1.2
Pin Configuration
CLKIN
1
MRA
2
SR1
VSS
8
VDD
7
SR0
3
6
ModOUT
4
5
SSON#
P2040A
Pin Description
Pin#
Pin
Name
Type
1
CLKIN
I
External reference frequency input. Connect to externally generated reference signal.
2
MRA
I
Digital logic input used to select modulation rate. This pin has an internal pull-up resistor.
3
SR1
I
Digital logic input used to select Spreading Range. This pin has an internal pull-up resistor.
4
VSS
P
Ground to entire chip. Connect to system ground.
5
SSON#
I
Digital logic input used to enable Spread Spectrum function (Active LOW). Spread Spectrum
function enabled when LOW, disabled when HIGH. This pin has an internal pull-low resistor.
6
ModOUT
O
Spread spectrum clock output.
7
SR0
I
Digital logic input used to select Spreading Range. This pin has an internal pull-up resistor.
8
VDD
P
Power supply for the entire chip (3.3V)
Description
Modulation Selection (Commercial)
MRA
SR1
SR0
Spreading Range
Modulation Rate (KHz)
0
0
0
± 1.125
(FIN /40) * 34.72KHz
0
0
1
± 1.75
(FIN /40) * 34.72KHz
0
1
0
± 0.75
(FIN /40) * 34.72KHz
0
1
1
± 1.25
(FIN /40) * 34.72KHz
1
0
0
± 1.25
(FIN /40) * 20.83KHz
1
0
1
± 2.00
(FIN /40) * 20.83KHz
1
1
0
Reserved
Reserved
1
1
1
Reserved
Reserved
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
2 of 9
P2040A
October 2005
rev 1.2
Spread Range Selection at 50MHz (Automotive)
MRA
SR1
SR0
Spreading Range
Modulation Rate
0
0
0
± 1.25
(FIN/40) * 34.72KHz
0
0
1
± 2.00
(FIN/40) * 34.72KHz
0
1
0
± 1.00
(FIN/40) * 34.72KHz
0
1
1
± 1.50
(FIN/40) * 34.72KHz
1
0
0
± 1.25
(FIN/40) * 20.83KHz
1
0
1
± 2.00
(FIN/40) * 20.83KHz
1
1
0
± 1.25
(FIN/40) * 20.83KHz
1
1
1
± 2.00
(FIN/40) * 20.83KHz
Spread Range Selection at 70MHz (Automotive)
MRA
SR1
SR0
Spreading Range
Modulation Rate
0
0
0
± 1.00
(FIN/40) * 34.72KHz
0
0
1
± 1.50
(FIN/40) * 34.72KHz
0
1
0
± 0.70
(FIN/40) * 34.72KHz
0
1
1
± 1.00
(FIN/40) * 34.72KHz
1
0
0
± 1.15
(FIN/40) * 20.83KHz
1
0
1
± 2.00
(FIN/40) * 20.83KHz
1
1
0
± 1.15
(FIN/40) * 20.83KHz
1
1
1
± 1.75
(FIN/40) * 20.83KHz
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
3 of 9
P2040A
October 2005
rev 1.2
Spread Spectrum Selection
The Modulation Selection Table defines the possible spread spectrum options. The optimal setting should minimize system
EMI to the fullest without affecting system performance. The spreading is described as a percentage deviation of the center
frequency. (Note: The center frequency is the frequency of the external reference input on CLKIN, pin1).
For example, P2040A is designed for high-resolution, flat panel applications and is able to support an XGA (1024 x 768) flat
panel operating at 65MHz (FIN) clock speed. A spreading selection of MRA=0, SR1=1 and SR0=0 provides a percentage
deviation of ±0.75% from FIN. This results in the frequency on ModOUT being swept from 64.51MHz to 65.49MHz at a
modulation rate of 56.24KHz. Refer Modulation Selection Table. The example in the following illustration is a common EMI
reduction method for a notebook LCD panel and has already been implemented by most of the leading OEM and mobile
graphic accelerator manufacturers.
Application Schematic for Mobile LCD Graphics Controllers
65MHz from graphics accelerator
1
CLKIN
2
MRA
P2040A
VDD
8
SR0
7
6
3
SR1
ModOUT
4
VSS
SSON#
0.1µF
+3.3V
Modulated 65MHz signal with
±0.75 deviation and modulation
rate of 56.24KHz. This signal is
connected back to the spread
spectrum input pin (SSIN) of the
graphics accelerator.
5
Digital control for the SS enable
or disable
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
4 of 9
P2040A
October 2005
rev 1.2
Absolute Maximum Ratings
Symbol
VDD, VIN
TSTG
Parameter
Rating
Unit
Voltage on any pin with respect to Ground
-0.5 to +7.0
V
Storage temperature
-65 to +125
°C
TC
Operating temperature-Commercial
0 to 70
°C
TA
Operating temperature – Automotive
-40 to +125
°C
TJ
Junction Temperature
150
°C
2
KV
Static Discharge Voltage
TDV
(As per JEDEC STD22- A114-B)
Note: These are stress ratings only and are not implied for functional use. Exposure to absolute maximum ratings for prolonged periods of time may affect
device reliability.
DC Electrical Characteristics
(Test condition: All parameters are measured at room temperature (+25°C) unless otherwise stated)
Symbol
Parameter
VIL
Input low voltage
VIH
Input high voltage
Input low current
(pull-up resistor on inputs SR0, SR1 and MRA)
Input high current (pull-down resistor on input SSON#)
IIL
IIH
Min
Typ
Max
Unit
VSS - 0.3
-
0.8
V
2.0
-
VDD + 0.3
V
-35
-
-
µA
-
-
35
µA
VOL
Output low voltage (VDD = 3.3V, IOL = 20mA)
-
-
0.4
V
VOH
Output high voltage (VDD = 3.3V, IOH = 20mA)
2.5
-
-
V
IDD
Static supply current standby mode
-
0.6
-
mA
ICC
VDD
tON
ZOUT
Dynamic supply current (3.3V and 10pF loading)
7
10
13
mA
2.7
3.3
3.7
V
Power-up time (first locked cycle after power up)
-
0.18
-
mS
Clock output impedance
-
50
-
Ω
Operating voltage
AC Electrical Characteristics
Symbol
Parameter
Min
Typ
Max
Unit
fIN
Input frequency
30
-
100
MHz
fOUT
Output frequency
30
-
100
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)
-
-
360
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
P2040A
October 2005
rev 1.2
Package Information
8-lead (150-mil) SOIC Package
H
E
D
A2
A
C
A1
D
θ
e
L
B
Dimensions
Symbol
Inches
Min
Max
Millimeters
Min
Max
A1
0.004
0.010
0.10
0.25
A
0.053
0.069
1.35
1.75
A2
0.049
0.059
1.25
1.50
B
0.012
0.020
0.31
0.51
C
0.007
0.010
0.18
0.25
D
0.193 BSC
4.90 BSC
E
0.154 BSC
3.91 BSC
e
0.050 BSC
1.27 BSC
H
0.236 BSC
6.00 BSC
L
0.016
0.050
0.41
1.27
θ
0°
8°
0°
8°
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
6 of 9
P2040A
October 2005
rev 1.2
8-lead Thin Shrunk Small Outline Package (4.40-MM Body)
H
E
D
A2
A
C
θ
e
A1
L
B
Dimensions
Symbol
Inches
Min
Millimeters
Max
A
Min
Max
0.043
1.10
A1
0.002
0.006
0.05
0.15
A2
0.033
0.037
0.85
0.95
B
0.008
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
0.026 BSC
0.65 BSC
H
0.252 BSC
6.40 BSC
L
0.020
0.028
0.50
0.70
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
P2040A
October 2005
rev 1.2
Ordering Information
Part number
Marking
Package Type
Temperature
P2040A -08-ST
P2040A
8-Pin SOIC,Tube
Commercial
P2040A -08-SR
P2040A
8-Pin SOIC, Tape and Reel
Commercial
P2040AF-08-ST
P2040AF
8-Pin SOIC, Tube, Pb Free
Commercial
P2040AF-08-SR
P2040AF
8-Pin SOIC, Tape and Reel, Pb Free
Commercial
P2040AG-08-ST
P2040AG
8-Pin SOIC, Tube, Green
Commercial
P2040AG-08-SR
P2040AG
8-Pin SOIC, Tape and Reel, Green
Commercial
I2040A-08-ST
I2040A
8-Pin SOIC, Tube
Industrial
I2040A-08-SR
I2040A
8-Pin SOIC, Tape and Reel
Industrial
I2040AF-08-ST
I2040AF
8-Pin SOIC, Tube, Pb Free
Industrial
I2040AF-08-SR
I2040AF
8-Pin SOIC, Tape and Reel, Pb Free
Industrial
I2040AG-08-ST
I2040AG
8-Pin SOIC, Tube, Green
Industrial
I2040AG-08-SR
I2040AG
8-Pin SOIC, Tape and Reel, Green
Industrial
P2040A-08-TT
P2040A
8-Pin TSSOP, Tube
Commercial
P2040A-08-TR
P2040A
8-Pin TSSOP, Tape and Reel
Commercial
P2040AF-08-TT
P2040AF
8-Pin TSSOP, Tube, Pb Free
Commercial
P2040AF-08-TR
P2040AF
8-Pin TSSOP, Tape and Reel, Pb Free
Commercial
P2040AG-08-TT
P2040AG
8-Pin TSSOP, Tube, Green
Commercial
P2040AG-08-TR
P2040AG
8-Pin TSSOP, Tape and Reel, Green
Commercial
I2040A-08-TT
I2040A
8-Pin TSSOP, Tube
Industrial
I2040A-08-TR
I2040A
8-Pin TSSOP, Tape and Reel
Industrial
I2040AF-08-TT
I2040AF
8-Pin TSSOP, Tube, Pb Free
Industrial
I2040AF-08-TR
I2040AF
8-Pin TSSOP, Tape and Reel, Pb Free
Industrial
I2040AG-08-TT
I2040AG
8-Pin TSSOP, Tube, Green
Industrial
I2040AG-08-TR
I2040AG
8-Pin TSSOP, Tape and Reel, Green
Industrial
Device Ordering Information
P 2 0 4 0 A
F - 0 8 X X
SR - SOIC, T/R
TT – TSSOP, TUBE
TR - TSSOP, T/R
ST – SOIC, TUBE
Pin Count
F = Lead Free and and RoHS compliant part
G = Green
Deviation (%) and Spread option Identifier
DEVICE NUMBER
Licensed under U.S Patent Nos 5,488,627 and 5,631,921
Flow:
P = Commercial Temperature Range (0°C to 70°C)
I = Industrial Temperature Range (-40°C to 85°C)
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
8 of 9
P2040A
October 2005
rev 1.2
Copyright © Alliance Semiconductor
All Rights Reserved
Preliminary Information
Part Number: P2040A
Document Version: v1.2
Alliance Semiconductor Corporation
2575 Augustine Drive,
Santa Clara, CA 95054
Tel# 408-855-4900
Fax: 408-855-4999
www.alsc.com
Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to Alliance Semiconductor, dated 11-11-2003
© 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
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particular purpose, merchantability, or infringement of any intellectual property rights, except as express agreed to in Alliance's
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claims arising from such use.
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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