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December 2003 rev 1.0
LCD Panel EMI Reduction IC
Features
FCC approved method of EMI attenuation. Provides up to 15 dB of EMI suppression Generates a low EMI spread spectrum clock of the input frequency 50 MHz to 170 MHz 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 16 mA output drives TTL or CMOS compatible outputs Ultra low power CMOS design Supports most mobile graphic accelerator and LCD timing controller specifications Available in 8 pin SOIC and TSSOP
P2040C
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 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 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 P2040C is targeted towards digital flat panel applications for Notebook PCs, Palm-size PCs, Office Automation Equipments, and LCD Monitors.
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.
December 2003 rev 1.0
Block Diagram
P2040C
SR0 SR1 MRA SSON#
VDD
Modulation CLKIN Frequency Divider Feedback Divider
PLL
Phase Detector
Loop Filter
VCO
Output Divider
ModOUT
VSS
Pin Configuration
CLKIN MRA SR1 VSS
1 2 8 7
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 (3.3V)
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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December 2003 rev 1.0
Modulation Selection (Commercial) - Table 1
MRA SR1 SR0 Spreading Range Modulation Rate
P2040C
0 0 0 0 1 1 1 1
0 0 1 1 0 0 1 1
0 1 0 1 0 1 0 1
54 MHz +/-1.4% +/-2.0% +/-1.1% +/-1.8% +/-1.3% +/-2.2% +/-1.4% +/-2.1%
65 MHz +/-1.2% +/-1.9% +/-0.9% +/-1.5% +/-1.3% +/-2.1% +/-1.3% +/-2.1%
81 MHz +/-1.0% +/-1.6% +/-0.5% +/-1.0% +/-1.3% +/-2.1% +/-1.4% +/-2.1%
108 MHz +/-0.8% +/-1.2% +/-0.4% +/-0.6% +/-1.2% +/-1.9% +/-1.2% +/-2.0%
162 MHz +/-0.4% +/-0.8% +/-0.3% +/-0.4% +/-1.1% +/-1.8% +/-0.9% +/-1.4%
(Fin/80) * 62.49 KHz (Fin/80) * 62.49 KHz (Fin/80) * 62.49 KHz (Fin/80) * 62.49 KHz (Fin/80) * 20.83 KHz (Fin/80) * 20.83 KHz (Fin/80) * 20.83 KHz (Fin/80) * 20.83 KHz
Spread Spectrum Selection 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 54MHz 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 results 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. P2040C Application Schematic for Mobile LCD Graphics
65MHz from graphics accelerator
1
CLKIN MRA SR1 VSS
VDD SR0 ModOUT SSON#
8
2
7
0.1F
Modulated 65MHz signal with 0.75 deviation and modulation rate of 56.24KHz. This signal is connected back to the spread +3.3V spectrum input pin (SSIN) of the graphics accelerator.
3
6
4
5
P2040C
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.
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December 2003 rev 1.0
EMC Software Simulation
P2040C
By using Alliance EMI-Lator(R)1 electromagnetic interference simulation software, radiated system level EMI analysis can be made easier to allow a quantitative assessment of EMI reduction products. The simulation engine of this EMC software has already been characterized to correlate to the electrical characteristics of the Alliance EMI reduction ICs. The following illustration is an example of the simulation result. Please visit our website at www.alsc.com for information on how to obtain a free copy and a demonstration of the EMI-Lator simulation software.
Simulation results From EMI-Lator(R)
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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Absolute Maximum Ratings Symbol VDD, VIN TSTG TA Storage Temperature Operating Temperature Parameter Voltage on any pin with respect to GND Rating -0.5 to +7.0 -65 to +125 0 to +70
P2040C
Unit V C C
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 Symbol VIL VIH IIL IIH VOL VOH IDD ICC VDD tON ZOUT Parameter Input Low Voltage Input High Voltage Input Low Current (pull-up resistor on inputs SR0, 1 and MRA) Input High Current (pull-down resistor on input SSON#) Output Low Voltage (VDD=3.3V, IOL = 20 mA) Output High Voltage (VDD=3.3V, IOH = 20 mA) Static Supply Current Dynamic Supply Current (3.3V and 15 pF loading) Operating Voltage Power Up Time (First locked clock cycle after power up) Clock Output Impedance Min GND - 0.3 2.0 2.5 9 2.7 Typ 0.6 16 3.3 0.18 50 Max 0.8 VDD + 0.3 -35 35 0.4 22 3.7 Unit V V A A V V mA mA V mS
AC Electrical Characteristics Symbol fIN tLH * tHL * tJC tD Parameter Input Frequency, P2040C Output Rise Time (0.8V to 2.0V) Output Fall Time (2.0V to 0.8V) Jitter (cycle to cycle) Output Duty Cycle Min 50 0.7 0.6 45 Typ 120 0.9 0.8 50 Max 175 1.1 1.0 360 55 Unit MHz ns ns ps %
*tLH and tHL are measured into a capacitive load of 15pF
Package Information
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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December 2003 rev 1.0
8-Pin SOIC
P2040C
E
H
D
A2
A
e B A 1
C L
Symbol
Dimensions in inches Min Max 0.071 0.010 0.069 0.020 0.01 0.202 0.164
Dimensions in millimeters Min 1.45 0.10 1.35 0.31 0.10 4.72 3.75 Max 1.80 0.25 1.75 0.51 0.25 5.12 4.15 1.27 BSC 5.70 0.30 0 6.30 0.70 8
A A1 A2 B C D E e H L
0.057 0.004 0.053 0.012 0.004 0.186 0.148
0.050 BSC 0.224 0.012 0 0.248 0.028 8
D
8-Pin TSSOP
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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December 2003 rev 1.0
P2040C
H
E D A2 A e B A1 L C
Dimensions in inches Symbol A A1 A2 B C D E e H L Min 0.047 0.002 0.031 0.007 0.004 0.114 0.169 0.006 0.041 0.012 0.008 0.122 0.177 Max
Dimensions in millimeters Min Max 1.10 0.05 0.80 0.19 0.09 2.90 4.30 0.65 BSC 6.20 0.45 0 6.60 0.75 8 0.15 1.05 0.30 0.20 3.10 4.50
0.026 BSC 0.244 0.018 0 0.260 0.030 8
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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Ordering Information Part Number A2040C-08ST A2040C-08SR A2040C-08TT A2040C-08TR I2040C-08ST I2040C-08SR I2040C-08TT I2040C-08TR P2040C-08ST P2040C-08SR P2040C-08TT P2040C-08TR Part Numbering Guide X 1 2040 2 C 3 08 4 Marking A2040C A2040C A2040C A2040C I2040C I2040C I2040C I2040C P2040C P2040C P2040C P2040C 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 2500 2500 2500 2500 2500 2500 Qty/reel
P2040C
Temperature -40C to 125C -40C to 125C -40C to 125C -40C to 125C -40C to 125C -40C to 125C -40C to 125C -40C to 125C 0C to 70C 0C to 70C 0C to 70C 0C to 70C
XX 5
1. Flow Prefix: a. A = Automotive temperature range (-40C to 125C) b. I = Industrial Temperature range (-40C to 85C) c. C = Commercial temperature range (0C to 70) 2. Device Number 3. Deviation (%) and spread option identifier 4. Device pin count 5. Package identifier a. ST - SOIC in TUBE b. SR - SOIC in TAPE & REEL c. TT - TSSOP in TUBE d. TR - TSSOP in TAPE & REEL
Licensed under US patent #5,488,627, #6,646,463 and #5,631,920.
LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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December 2003 rev 1.0
P2040C
Alliance Semiconductor Corporation 2595, 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: v1.0
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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