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September 2005 rev 1.4 LCD Panel EMI Reduction IC
Features
FCC approved method of EMI attenuation. Provides up to 15dB of EMI suppression Generates a low EMI spread spectrum clock of the input frequency 50MHz to 170MHz input frequency range Optimized for 54MHz, 65MHz, 81MHz, 140MHz, and 162MHz pixel clock frequencies Internal loop filter minimizes external components and board space 8 selectable spread ranges, up to 2.2% SSON# control pin for spread spectrum enable and disable options 2 selectable modulation rates Low Cycle-to-cycle jitter 3.3V Operating Voltage Ultra low power CMOS design Supports most mobile graphic accelerator and LCD timing controller specifications Available in 8 pin SOIC and TSSOP Packages
P2040C
system wide reduction of EMI of all clock dependent signals. The P2040C allows significant system cost savings by reducing the number of circuit board layers and shielding that are traditionally required to pass EMI regulations. The P2040C uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all-digital method. The P2040C 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 result in a 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 P2040C is targeted towards digital flat panel applications for Notebook PCs, Palm-size PCs, Office Automation Equipments and LCD Monitors.
Product Description
The P2040C is a selectable spread spectrum frequency modulator designed specifically for digital flat panel applications. The P2040C reduces electromagnetic interference (EMI) at the clock source which provides
Block Diagram
SR0 SR1 MRA SSON# VDD
Modulation CLKIN Frequency Divider Feedback Divider
PLL
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.
September 2005 rev 1.4
Pin Configuration
CLKIN MRA SR1 VSS
1 2 8 7
P2040C
VDD SR0 ModOUT SSON#
P2040C
3 4 6 5
Pin Description Pin#
1 2 3 4 5 6 7 8
Pin Name
CLKIN MRA SR1 VSS SSON# ModOUT SR0 VDD
Type
I I I P I O I P
Description
External reference frequency input. Connect to externally generated reference signal. Digital logic input used to select modulation rate. This pin has an internal pull-up resistor. Digital logic input used to select Spreading Range. This pin has an internal pull-up resistor. Ground to entire chip. Connect to system ground. 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. Spread spectrum Clock Output. Digital logic input used to select Spreading Range. This pin has an internal pull-up resistor. Power supply for the entire chip.
Modulation Selection (Commercial) - Table 1 MRA
0 0 0 0 1 1 1 1
SR1
0 0 1 1 0 0 1 1
SR0
0 1 0 1 0 1 0 1
Spreading Range 54MHz
1.4% 2.0% 1.1% 1.8% 1.3% 2.2% 1.4% 2.1%
65MHz
1.2% 1.9% 0.9% 1.5% 1.3% 2.1% 1.3% 2.1%
81MHz
1.0% 1.6% 0.5% 1.0% 1.3% 2.1% 1.4% 2.1%
140MHz
0.6% 1.0% 0.3% 0.54% 1.25% 2.0% 1.2% 1.9%
162MHz
0.4% 0.8% 0.3% 0.4% 1.1% 1.8% 0.9% 1.4%
Modulation Rate
(Fin/80) * 62.49KHz (Fin/80) * 62.49KHz (Fin/80) * 62.49KHz (Fin/80) * 62.49KHz (Fin/80) * 20.83KHz (Fin/80) * 20.83KHz (Fin/80) * 20.83KHz (Fin/80) * 20.83KHz
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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Spread Spectrum Selection
P2040C
Table 1 illustrates 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, Pin 1). Example: P2040C is designed for high resolution flat panel applications and is able to support panel frequencies from 50MHz to 170MHz. For a 65MHz pixel clock frequency, a spreading selection of MRA=0, SR1=1 and SR0 =1 provides a percentage deviation of 1.50% (see Table 1). This result in frequency on ModOUT being swept from 64.03MHz to 65.98MHz at a modulation rate of 50.77KHz (see Table 1). This particular example (see Figure below) given here is a common EMI reduction method for 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 MRA SR1
VDD 8 SR0 7 ModOUT SSON#
6
2
0.1F
Modulated 65MHz signal with 1.5 % deviation and modulation rate of 50.77KHz. This signal is connected back to the spread +3.3V spectrum input pin (SSIN) of the graphics accelerator.
3
4 VSS
5
P2040C
Digital control for the SS enable or disable
LCD Panel EMI Reduction IC
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Absolute Maximum Ratings Symbol
VDD, VIN TSTG TA Ts JA TJ TDV Storage temperature Operating temperature Max. Soldering Temperature (10 sec) Thermal Resistance from Junction For SOIC Package to Ambient ( No Air Flow) For TSSOP Package Junction Temperature Static Discharge Voltage (As per JEDEC STD22- A114-B)
P2040C
Parameter
Voltage on any pin with respect to Ground
Rating
-0.5 to +7.0 -65 to +125 -20 to +85 260 156.5 124 150 2
Unit
V C C C C/W C KV
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 (+25C) unless otherwise stated)
Symbol
VIL VIH IIL IIH VOL VOH IDD ICC VDD tON ZOUT Input low voltage Input high voltage
Parameter
Min
VSS - 0.3 2.0 2.5 9 3.0 -
Typ
0.7 16 3.3 0.18 50
Max
0.8 VDD + 0.3 -40 40 0.4 22 3.6 -
Unit
V V A A V V mA mA V mS
Input low current (pull-up resistor on inputs SR0, SR1 and MRA) Input high current (pull-down resistor on input SSON#) Output low voltage (VDD = 3.3V, IOL = 20mA) Output high voltage (VDD = 3.3V, IOL = 20mA) Static supply current standby mode Dynamic supply current (3.3V and 10pF loading) Operating Voltage Power-up time (first locked cycle after power up) Clock output impedance
AC Electrical Characteristics Symbol
fIN tLH* tHL* tJC tD Input frequency Output rise time (measured at 0.8V to 2.0V) Output fall time (measured at 2.0V to 0.8V) Jitter (cycle to cycle) Output duty cycle
Parameter
Min
50 0.3 0.3 45
Typ
0.7 0.7 50
Max
170 1.0 1.0 360 55
Unit
MHz nS nS pS %
*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.
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Package Information 8-lead (150-mil) SOIC Package
P2040C
E
H
D
A2
A
e B A 1
C L
D
Dimensions
Symbol Min
A1 A A2 B C D E e H L
Inches Max
0.010 0.069 0.059 0.020 0.010 0.004 0.053 0.049 0.012 0.007
Millimeters Min Max
0.10 1.35 1.25 0.31 0.18 4.90 BSC 3.91 BSC 1.27 BSC 6.00 BSC 0.41 0 1.27 8 0.25 1.75 1.50 0.51 0.25
0.193 BSC 0.154 BSC 0.050 BSC 0.236 BSC 0.016 0 0.050 8
LCD Panel EMI Reduction IC
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P2040C
8-lead Thin Shrunk Small Outline Package (4.40-MM Body)
H
E D A2 A e B A1 L C
Dimensions Symbol Min
A A1 A2 B c D E e H L 0.020 0 0.002 0.033 0.008 0.004 0.114 0.169 0.026 BSC 0.252 BSC 0.028 8 0.50 0
Inches Max
0.043 0.006 0.037 0.012 0.008 0.122 0.177 0.05 0.85 0.19 0.09 2.90 4.30
Millimeters Min Max
1.10 0.15 0.95 0.30 0.20 3.10 4.50 0.65 BSC 6.40 BSC 0.70 8
LCD Panel EMI Reduction IC
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September 2005 rev 1.4
Ordering Information Part Number
P2040C-08ST P2040C-08SR P2040C-08TT P2040C-08TR I2040C-08ST I2040C-08SR I2040C-08TT I2040C-08TR X2040C-08ST X2040C-08SR X2040C-08TT X2040C-08TR P2040CF-08ST P2040CF-08SR P2040CF-08TT P2040CF-08TR I2040CF-08ST I2040CF-08SR I2040CF-08TT I2040CF-08TR X2040CF-08ST X2040CF-08SR X2040CF-08TT X2040CF-08TR P2040CG-08ST P2040CG-08SR P2040CG-08TT P2040CG-08TR I2040CG-08ST I2040CG-08SR I2040CG-08TT I2040CG-08TR X2040CG-08ST X2040CG-08SR X2040CG-08TT X2040CG-08TR
P2040C
Marking
P2040C P2040C P2040C P2040C I2040C I2040C I2040C I2040C X2040C X2040C X2040C X2040C P2040CF P2040CF P2040CF P2040CF I2040CF I2040CF I2040CF I2040CF X2040CF X2040CF X2040CF X2040CF P2040CG P2040CG P2040CG P2040CG I2040CG I2040CG I2040CG I2040CG X2040CG X2040CG X2040CG X2040CG
Package Type
8-Pin SOIC, TUBE 8-Pin SOIC, TAPE & REEL 8-Pin TSSOP, TUBE 8-Pin TSSOP, TAPE & REEL 8-Pin SOIC, TUBE 8-Pin SOIC, TAPE & REEL 8-Pin TSSOP, TUBE 8-Pin TSSOP, TAPE & REEL 8-Pin SOIC, TUBE 8-Pin SOIC, TAPE & REEL 8-Pin TSSOP, TUBE 8-Pin TSSOP, TAPE & REEL 8-Pin SOIC, TUBE, Pb Free 8-Pin SOIC, TAPE & REEL, Pb Free 8-Pin TSSOP, TUBE, Pb Free 8-Pin TSSOP, TAPE & REEL, Pb Free 8-Pin SOIC, TUBE, Pb Free 8-Pin SOIC, TAPE & REEL, Pb Free 8-Pin TSSOP, TUBE, Pb Free 8-Pin TSSOP, TAPE & REEL, Pb Free 8-Pin SOIC, TUBE, Pb Free 8-Pin SOIC, TAPE & REEL, Pb Free 8-Pin TSSOP, TUBE, Pb Free 8-Pin TSSOP, TAPE & REEL, Pb Free 8-Pin SOIC, TUBE, Green 8-Pin SOIC, TAPE & REEL, Green 8-Pin TSSOP, TUBE, Green 8-Pin TSSOP, TAPE & REEL, Green 8-Pin SOIC, TUBE, Green 8-Pin SOIC, TAPE & REEL, Green 8-Pin TSSOP, TUBE, Green 8-Pin TSSOP, TAPE & REEL, Green 8-Pin SOIC, TUBE, Green 8-Pin SOIC, TAPE & REEL, Green 8-Pin TSSOP, TUBE, Green 8-Pin TSSOP, TAPE & REEL, Green
Qty/reel
2500 2500 2500 2500 2500 2500 2500 2500 2500 2500 2500 2500 2500 2500 2500 2500 2500 2500
Temperature
See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow See Flow
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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Device Ordering Information
P2040C
P2040CF-08XX
Package: ST - SOIC, TUBE SR - SOIC, T/R TT - TSSOP, TUBE TR - TSSOP, T/R
Pin Count
F = Pb FREE and RoHS COMPLIANT PART G = Green
DEVICE NUMBER
Flow: P = Commercial Temperature Range (0C to 70C) I = Industrial Temperature Range (-40C to 85C) X = Automotive Temperature Range (-40C to 125C)
Licensed under U.S Patent Nos 5,488,627 and 5,631,921
LCD Panel EMI Reduction IC
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September 2005 rev 1.4
P2040C
Alliance Semiconductor Corporation 2575 Augustine Drive, Santa Clara, CA 95054 Tel# 408-855-4900 Fax: 408-855-4999 www.alsc.com
Copyright (c) Alliance Semiconductor All Rights Reserved Preliminary Information Part Number: P2040C Document Version: v1.4
Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to Alliance Semiconductor, dated 11-11-2003
(c) 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.
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