P2041A PULSECORE | Alldatasheet
Document overview
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Technical content
Features
FCC approved method of EMI attenuation Provides up to 20dB of EMI suppression Generates a low EMI spre ad spectrum clock of the input frequency Optimized for 25MHz 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 Low Cycle-to-cycle jitter 3.3V or 5.0V operating voltage Low power CMOS design Available in 8 pin SOIC and TSSOP Packages Product Description The P2041A is a selectable spread spectrum frequency modulator designed specifically for PC peripheral and embedded controller markets. The P2041A reduces electromagnetic interference (EMI) at the clock source which provides system wide reduction of EMI of all clock dependent signals. The P2041A allows significant system cost savings by reducing the number of circuit board layers and shielding that are traditionally required to pass EMI regulations. The P2041A uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all-digital method. The P2041A 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 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 P2041A is targeted towards the embedded controller market and PC peripheral markets including scanners, MFP’s, printers, PDA, IA , and GPS devices. Block Diagram XIN ModOUT VSS Frequency Divider Feedback Divider Modulation Phase Detector Loop Filter VCO Output Divider PLL VDD SSON SR0 SR1 Crystal Oscillator XOUT
rev 0.2 Versatile EMI Reduction IC 2 of 8 Notice: The information in this document is subject to change without notice. SSON ModOUT Pin Configuration Pin Description Pin# Pin Name Type Description 1 XIN/CLK I Connect to crystal or externally generated clock signal. 2 XOUT I Connect to crystal. No connect if externally generated clock signal is used. 3 SR1 I Digital logic input used to select Spreading Range (see Table 1). This pin has an internal pull-up resistor. 4 VSS P Ground Connection. Connect to system ground. 5 SSON I Digital logic input used to enable Spread Spectrum function (Active Low). Spread Spectrum function enable when low. 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 (see Table 1). This pin has an internal pull-up resistor. 8 VDD P Connect to +3.3V or +5.0V Spread Range Selection SR1 SR0 Spreading Range Modulation rate XOUT SR0 4 5 P2040C XIN/CLK SR1 VSS VDD 1 4 5 P2041A SR1 VDD
rev 0.2 Versatile EMI Reduction IC 3 of 8 Notice: The information in this document is subject to change without notice. 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 XIN/CLK, Pin 1). Example of a typical printer or scanner application that operates on a clock frequency of 40MHz: A spreading selection of SR1=1 and SR0=1 provides a perce ntage deviation of +/-1.00%* (see Table 1) of Center Frequency. This results in the frequency on ModOUT being sw ept from 40.40MHz to 39.60MHz at a modulation rate of (40/40)*34.72 = 34.72KHz (see Table 1). This particular exam ple (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 P2041A can be set to +/-2.5% when working with certain scanner model. Absolute Maximum Ratings Symbol Parameter Rating Unit VDD, VIN Voltage on any pin with respect to Ground -0.5 to +7.0 V TSTG Storage temperature -65 to +125 °C TA Operating temperature -40 to +85 °C Ts Max. Soldering Temperature (10 sec) 260 °C TJ Junction Temperature 150 °C TDV Static Discharge Voltage (As per JEDEC STD22- A114-B) 2 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. VDD SR0 ModOUT SSONVSS SR1 XOUT XIN/CLK P2041A VDD Modulated 40MHz signal with ± 1.00% Deviation and modulation rate of 34.72KHz. This signal is connected back to the clock crystal Input pin of the system ASIC. NOTE: The above schematic indicates The exact setting of this example: Default setting (no connection on pin 3, 7 and 5) 40MHz 0.1µF
rev 0.2 Versatile EMI Reduction IC 4 of 8 Notice: The information in this document is subject to change without notice. (Test condition: All parameters are measured at room temperature (+25°C) unless otherwise stated) Symbol Parameter Min Typ Max Unit ( For 3.3V Supply Voltage) VSS –0.3 - 0.8 VIL Input low Voltage ( For 5V Supply Voltage) - - 1.5 V ( For 3.3V Supply Voltage) 2.0 - VDD + 0.3 VIH Input low Voltage ( For 5V Supply Voltage) 3.5 - - V ( For 3.3V Supply Voltage) - - -35 IIL Input Low Current (pull-up resistor on inputs SR0, SR1) ( For 5V Supply Voltage) - - -100 µA ( For 3.3V Supply Voltage) - - 35 IIH Input High Current (pull-down resistor on input SSON ) ( For 5V Supply Voltage) - - 100 µA IXOL XOUT Output Low Current (V XOL @ 0.4V, VDD = 3.3V) - 3 - IXOH XOUT Output High Current ( V XOH@ 2.5V, VDD = 3.3V) - 3 - mA mA (VDD=3.3V, IOL = 20 mA) - - 0.4 VOL Output Low Voltage (VDD=5V, IOL = 20 mA) - - 0.5 V (VDD=3.3V, IOH = 20 mA) 2.5 - - VOH Output High Voltage (VDD=5V, IOH = 20 mA) 4.5 - - V IDD Static Supply Current - 1.0 - mA 3.3V and 15pF loading - - 22 ICC Dynamic Supply Current 5V and 15pF loading - - 35 mA VDD Operating Volt age 2.7 3.3 5.5 V Symbol Parameter Min Typ Max Unit fIN Input Frequency 25 40 60 MHz tLH* Output rise time tHL* Output fall time 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
rev 0.2 Versatile EMI Reduction IC 5 of 8 Notice: The information in this document is subject to change without notice.
Package Information
8-lead (150-mil) SOIC Package D E H D A2 A θ L C B e Dimensions Inches Millimeters Symbol Min Max 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°
rev 0.2 Versatile EMI Reduction IC 6 of 8 Notice: The information in this document is subject to change without notice. E H A D B C L θ e 8-lead TSSOP (4.40-MM Body) Dimensions Inches Millimeters Symbol Min Max Min Max A 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°
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Ordering Information
Part number Marking Package Configuration Temperature Range P2041AF-08ST P2041AF 8-Pin SOIC, Tube, Pb Free Commercial P2041AF-08SR P2041AF 8-Pin SOIC, Tape and Reel, Pb Free Commercial P2041AF-08TT P2041AF 8-Pin TSSOP, Tube, Pb Free Commercial P2041AF-08TR P2041AF 8-Pin TSSOP, Tape and Reel, Pb Free Commercial P2041AG-08ST P2041AG 8-Pin SOIC, Tube, Green Commercial P2041AG-08SR P2041AG 8-Pin SOIC, Tape and Reel, Green Commercial P2041AG-08TT P2041AG 8-Pin TSSOP, Tube, Green Commercial P2041AG-08TR P2041AG 8-Pin TSSOP, Tape and Reel, Green Commercial I2041AF-08ST I2041AF 8-Pin SOIC, Tube, Pb Free Industrial I2041AF-08SR I2041AF 8-Pin SOIC, Tape and Reel, Pb Free Industrial I2041AF-08TT I2041AF 8-Pin TSSOP, Tube, Pb Free Industrial I2041AF-08TR I2041AF 8-Pin TSSOP, Tape and Reel, Pb Free Industrial I2041AG-08ST I2041AG 8-Pin SOIC, Tube, Green Industrial I2041AG-08SR I2041AG 8-Pin SOIC, Tape and Reel, Green Industrial I2041AG-08TT I2041AG 8-Pin TSSO P, Tube, Green Industrial I2041AG-08TR I2041AG 8-Pin TSSOP, Tape and Reel, Green Industrial Device Ordering Information P2041A F-08 ST Licensed under US patent Nos 5,488,627 and 5,631,920. SR - SOIC, T/R TT – TSSOP, TUBE TR - TSSOP, T/R ST – SOIC, TUBE DEVICE NUMBER P = Commercial Temperature Range (0°C to 70°C) I = Industrial Temperature Range (-40°C to 85°C) PIN COUNT Deviation (%) and Spread option Identifier F =Lead Free and and RoHS compliant part G = GREEN PACKAGE, LEAD FREE, and RoHS
rev 0.2 Versatile EMI Reduction IC 8 of 8 Notice: The information in this document is subject to change without notice. © Copyright 2006 PulseCore Semiconductor Corporation. All rights reserved. Our logo and name are trademarks or registered trademarks of PulseCore Semiconductor. All ot her brand and product names may be the trademarks of their respective companies. PulseCore reserves the right to make changes to this document and its products at any time without notice. PulseCore assumes no responsibility for any errors t hat may appear in this document. The data contained herein represents PulseCore’s best data and/or estimates at the time of issuance. PulseCore reserves the right to change or correct this data at any time, without notice. If the product descri bed 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 in tended to operate as, or provide, any guarantee or warrantee to any user or customer. PulseCore does not assume any responsibility or liability arising out of the app lication or use of any product described herein, and disclaims any express or implied warrant ies related to the sale and/or use of PulseCore products including liability or warranties related to fitness for a particular purpose, mercha ntability, or infringement of any intellec tual property rights, except as express agreed to in PulseCore’ s Terms and Conditions of Sale (which are available from PulseCore). All sales of PulseCore products are made exclusiv ely according to PulseCore’s Terms and Conditions of Sale. The purchase of products from PulseCore does not convey a license under any patent rights, copyrights; mask works rights, trademarks, or any other intellect ual property rights of PulseCore or third partie s. PulseCore 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 PulseC ore products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify PulseCore against all claims arising from such use. PulseCore Semiconductor Corporation 1715 S. Bascom Ave Suite 200 Campbell, CA 95008 Tel: 408-879-9077 Fax: 408-879-9018 www.pulsecoresemi.com Copyright © PulseCore Semiconductor All Rights Reserved Part Number: P2041A Document Version: 0.2 Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003