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| October 2003 rev 1.0 LCD Panel EMI Reduction IC Features FCC approved method of EMI attenuation. Provides up to 20dB of EMI suppression. Generates a low EMI spread spectrum clock of the input frequency. Input frequency range: 30MHz to 110MHz. Optimized for VGA, SVGA, and higher resolution XGA LCD Panels. Internal loop filter minimizes external components and board space. Six selectable high spread ranges up to 2%. Two selectable modulation rates. SSON# control pin for spread spectrum enable and disable options. Low cycle-to-cycle jitter. Wide operating range. 16mA output drives. TTL or CMOS compatible outputs. Low power CMOS design. Supports most mobile graphic accelerator specifications. Products available for automotive temperature range. (Refer Spread Spectrum Range Selection Tables) Available in 8-pin SOIC and TSSOP. P2040A implemented in a proprietary all digital method. The P2040A 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 P2040A is targeted towards digital flat panel applications for notebook PCs, palm-size PCs, office automation equipments and LCD monitors. Product Description The P2040A is a versatile spread spectrum frequency modulator designed specifically for digital flat panel applications. The P2040A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The P2040A allows significant system cost savings by reducing the number of circuit board layers ferrite beads, regulations. The P2040A uses the most efficient and optimized modulation profile approved by the FCC and is shielding and other passive components that are traditionally required to pass EMI 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. October 2003 rev 1.0 Block Diagram P2040A SR0 SR1 MRA SSON# VDD DIV2 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# P2040A 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. 2 of 10 October 2003 rev 1.0 Modulation Selection (Commercial) 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 1.125 1.75 0.75 1.25 1.25 2.00 Reserved Reserved P2040A Modulation Rate (KHz) (FIN /40) * 34.72 KHz (FIN /40) * 34.72 KHz (FIN /40) * 34.72 KHz (FIN /40) * 34.72 KHz (FIN /40) * 20.83 KHz (FIN /40) * 20.83 KHz Reserved Reserved Spread Range Selection at 50MHz (Automotive) 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 1.25 2.00 1.00 1.50 1.25 2.00 1.25 2.00 Modulation Rate (FIN/40) * 34.72 KHz (FIN/40) * 34.72 KHz (FIN/40) * 34.72 KHz (FIN/40) * 34.72 KHz (FIN/40) * 20.83 KHz (FIN/40) * 20.83 KHz (FIN/40) * 20.83 KHz (FIN/40) * 20.83 KHz Spread Range Selection at 70MHz (Automotive) 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 1.00 1.50 0.70 1.00 1.15 2.00 1.15 1.75 Modulation Rate (FIN/40) * 34.72 KHz (FIN/40) * 34.72 KHz (FIN/40) * 34.72 KHz (FIN/40) * 34.72 KHz (FIN/40) * 20.83 KHz (FIN/40) * 20.83 KHz (FIN/40) * 20.83 KHz (FIN/40) * 20.83 KHz LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 3 of 10 October 2003 rev 1.0 Spread Spectrum Selection P2040A 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 64.51 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 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 P2040A 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 10 October 2003 rev 1.0 EMC Software Simulation P2040A 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. 5 of 10 October 2003 rev 1.0 Absolute Maximum Ratings Symbol VDD, VIN TSTG TC Storage temperature Operating temperature-Commercial Parameter Voltage on any pin with respect to Ground Rating 0.5 to +7.0 -65 to +125 0 to 70 P2040A Unit V C C Operating temperature - Automotive TA -40 to +125 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 Input low voltage Input high voltage 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 = 3.3 V, IOL = 20 mA) Output high voltage (VDD = 3.3 V, IOL = 20 mA) 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 Parameter Min GND - 0.3 2.0 - - - 2.5 - 7 2.7 - - Typ - - - - - - 0.6 10 3.3 0.18 50 Max 0.8 VDD + 0.3 -35 35 0.4 - - 13 3.7 - - Unit V V A A V V mA mA V mS AC Electrical Characteristics Symbol fIN fOUT tLH* tHL* tJC Input frequency Output 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) Parameter Min 30 30 0.7 0.6 45 Typ 0.9 0.8 50 Max 110 110 1.1 1.0 360 55 Unit MHz MHz ns ns ps % tD Output duty cycle *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. 6 of 10 October 2003 rev 1.0 Package Information 8-Pin SOIC P2040A E H D A2 A e B A 1 C L D 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 LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 7 of 10 October 2003 rev 1.0 8-Pin TSSOP P2040A 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. 8 of 10 October 2003 rev 1.0 P2040A Ordering Information Part Number A2040A-08ST A2040A-08SR A2040A-08TT A2040A-08TR I2040A-08ST I2040A-08SR I2040A-08TT I2040A-08TR P2040A-08ST P2040A-08SR P2040A-08TT P2040A-08TR Part Numbering Guide X 1 2040 2 A 3 08 4 XX 5 Marking A2040A A2040A A2040A A2040A I2040A I2040A I2040A I2040A P2040A P2040A P2040A P2040A 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 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 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 LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 9 of 10 October 2003 rev 1.0 P2040A Licensed under U.S Patent Nos 5,488,627 and 5,631,921 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: P2040A Document Version: v1.0 (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. 10 of 10 |
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