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November 2003 rev F
Versatile EMI Reduction IC
Features FCC approved method of EMI attenuation Provides up to 20 dB of EMI suppression Generates a low EMI spread spectrum clock of the input frequency Optimized for 25 MHz to 60MHz input frequency range Internal loop filter minimizes external components and board space 4 selectable spread ranges SSON control pin for spread spectrum enable and disable options Characterizes to work with EMI-Lator(R), EMC simulation program. Low cycle-to-cycle jitter 3.3 V or 5.0 V operating range 16 mA output drives TTL or CMOS compatible outputs Low power CMOS design Available in 8 pin SOIC and TSSOP Product Description The P2041 is a selectable spread spectrum frequency modulator designed specifically for PC peripheral and embedded controller markets .The P2041 reduces electromagnetic interference (EMI) at Block Diagram
P2041A
the clock source which provides system wide reduction of EMI of all clock dependent signals. The P2041 allows significant system cost savings by reducing the number of circuit board layers and shielding that are traditionally required to pass EMI regulations. The P2041 uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all-digital method. The P2041 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 P2041 is targeted towards the embedded controller market and PC peripheral markets including scanners, MFP's, printers, PDA, IA , and GPS devices.
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 rev F
Pin Configuration
P2041A
Pin Description Pin# 1 2 3 4 5 6 7 8 ModOUT SR0 VDD O I P Pin Name XIN/CLK XOUT SR1 VSS SSON Type I I I P I Description Connect to crystal or externally generated clock signal. Connect to crystal. No connect if externally generated clock signal is used. Digital logic input used to select Spreading Range (see Table 1). This pin has an internal pull-up resistor. Ground Connection. Connect to system ground. Digital logic input used to enable Spread Spectrum function (Active Low). Spread Spectrum function enable when low. This pin has an internal pulllow resistor. Spread Spectrum Clock Output. Digital logic input used to select Spreading Range (see Table 1). This pin has an internal pull-up resistor. Connect to +3.3V or +5.0V
Table 1 - Spread Range Selection FS0 0 0 1 1 SR0 0 1 0 1 Spreading Range +/- 1.50% +/- 2.50% +/- 0.50% +/- 1.00% Input Frequency (Fin/40)*34.72 KHz (Fin/40)*34.72 KHz (Fin/40)*34.72 KHz** (Fin/40)*34.72 KHz** Modulation rate 0 0 1 1
Versatile EMI Reduction IC
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P2041A
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 of a typical printer or scanner application that operates on a clock frequency of 40 MHz: A spreading selection of SR1=1 and SR0=1 provides a percentage deviation of +/-1.00%* (see Table 1) of Fcen. This results in the frequency on ModOUT being swept from 40.40 MHz to 39.60 MHz at a modulation rate of 40/40*34.72=34.72 KHz (see Table 1). This particular example (see Figure below) given here is a common EMI reduction method for scanners and has already been implemented by most of the leading manufacturers.
NOTE: Spreading range selection varies from different system manufacturers and their designs. The spreading range of P2041 can be set to +/-2.5% when working with certain scanner model.
P2041 Application Schematic for Flat-Bed Scanner
Versatile EMI Reduction IC
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P2041A
EMC Software Simulation By using Alliance Semiconductor's proprietary EMC simulation software - EMI-lator(R), radiated system level EMI analysis can be made easier to allow a quantitative assessment on Alliance's EMI reduction products. The simulation engine of this EMC software has already been characterized to correlate with the electrical characteristics of Alliance EMI reduction IC's. The figure below is an example of the simulation result. Please visit our web site at www.alsc.comfor information on how to obtain a free copy and demonstration of EMI-lator(R). Simulation Result from EMI-lator(R)
Versatile EMI Reduction IC
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Absolute Maximum Ratings Symbol VDD, VIN TSTG TA Parameter Voltage on any pin with respect to GND Storage temperature Operating temperature Rating -0.5 to + 7.0 -65 to +125 0 to +70
P2041A
Unit V C C
DC Electrical Characteristics Symbol VIL VIH IIL IIH IXOL IXOH VOL VOH IDD ICC VDD Input Low Voltage Input High Voltage Input Low Current (pull-up resistor on inputs SR0, 1) Input High Current (pull-down resistor on input SSON) XOUT Output Low Current (@ 0.4V, VDD = 3.3V) XOUT Output High Current (@ 2.5V, VDD = 3.3V) 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 Parameter Min GND - 0.3 2.0 2.5 7 2.7 Typ 3 3 0.6 8.6 3.3 Max 0.8 VDD + 0.3 -35 35 0.4 10 5.5 Unit V V A A mA mA V V mA mA V
AC Electrical Characteristics Symbol fIN tLH* tHL* tJC tD Parameter Input Frequency when Output rise time (Measured at 0.8V to 2.0V) Output fall time (Measured at 0.8V to 2.0V) Jitter (cycle to cycle) Output duty cycle Min 25 0.7 0.6 45 Typ 40 0.9 0.8 50 Max 60 1.1 1.0 360 55 Unit MHz ns ns ps %
*tLH and tHL are measured into a capacitive load of 15pF
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Package Information
P2041A
Mechanical Package Outline 8-Pin SOIC
Symbol A A1 A2 B C D E e H L a
Dimensions in inches Min 0.057 0.004 0.053 0.012 0.004 0.186 0.148 Nor 0.064 0.007 0.061 0.016 0.006 0.194 0.156 0.050 BSC 0.224 0.012 0 0.236 0.020 5 0.248 0.028 8 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 Nor 1.63 0.18 1.55 0.41 0.15 4.92 3.95 1.27 BSC 5.70 0.30 0 6.00 0.50 5 6.30 0.70 8 Max 1.80 0.25 1.75 0.51 0.25 5.12 4.15
Note: Controlling dimensions are millimeters
Versatile EMI Reduction IC
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Mechanical Package Outline 8-Pin TSSOP
P2041A
Dimensions in inches Symbol A A1 A2 B C D E e H L a 0.244 0.018 0 0.002 0.031 0.007 0.004 0.114 0.169 0.118 0.173 0.026 BSC 0.252 0.024 0.260 0.030 8 0.039 Min Nor Max 0.047 0.006 0.041 0.012 0.008 0.122 0.177
Dimensions in millimeters Min Nor Max 1.10 0.05 0.80 0.19 0.09 2.90 4.30 3.00 4.40 0.65 BSC 6.20 0.45 0 6.40 0.60 6.60 0.75 8 1.00 0.15 1.05 0.30 0.20 3.10 4.50
5
5
Note: Controlling dimensions are millimeters
Versatile EMI Reduction IC
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Ordering Codes Part Number P2041A-08ST P2041A-08SR P2041A-08TT P2041A-08TR Marking P2041A P2041A P2041A P2041A Package Type 8 PIN SOIC, TUBE 8 PIN SOIC, TAPE & REEL 8 PIN TSSOP, TUBE 8 PIN TSSOP, TAPE & REEL 2,500 2,500 Qty per reel
P2041A
Temperature (C) 0 TO 70 0 TO 70 0 TO 70 0 TO 70
Licensed under US patent Nos 5,488,627 and 5,631,920. Preliminary datasheet. Specification subject to change without notice.
Versatile EMI Reduction IC
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P2041A
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 Part Number: P2041A Document Version: F
(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.
Versatile EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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