ASM3I2531AF-08SR

February 2007 rev 1.4 Low Frequency EMI Reduction Features • • • • • • • • • • ASM3P2531A dependent signals. It allows significant system cost savings by reducing the number of circuit board layers and shielding traditionally required to pass EMI regulations. The ASM3P2531A modulates the output of a single PLL in order to spread the bandwidth of a synthesized clock, thereby decreasing 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 clock generators. Lowering EMI by increasing a signal’s bandwidth is called spread spectrum clock generation. The ASM3P2531A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all-digital method. FCC approved method of EMI attenuation. Generates a low EMI spread spectrum of the input clock frequency. Optimized for input frequency range between 27MHz – 55MHz. Internal loop filter minimizes external components and board space. Frequency Deviation: ±1.7%. Low inherent Cycle-to-cycle jitter. 3.3 V ± 0.3V Operating Voltage. Ultra low power CMOS design:3.0 mA @ 3.3 V. Supports notebook VGA and other LCD timing controller applications. Available in 8-pin SOIC and TSSOP Packages. Product Description The ASM3P2531A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. It reduces electromagnetic interference (EMI) at the clock source allowing systemwide reduction of EMI of downstream clock and data Applications The ASM3P2531A is targeted toward the notebook VGA chip and other displays using an LVDS interface, PC peripheral devices, and embedded systems. Block Diagram VDD STOP Modulation CLKIN Crystal Oscillator Frequency Divider Feedback Divider PLL Phase Detector Loop Filter VCO Output Divider ModOUT VSS PulseCore Semiconductor Corporation 1715 S. Bascom Ave Suite 200, Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018 www.pulsecoresemi.com Notice: The information in this document is subject to change without notice. February 2007 rev 1.4 Pin Configuration (8-pin SOIC and TSSOP Packages) ASM3P2531A CLKIN VDD VSS ModOUT 1 2 3 4 ASM3P2531A 8 7 6 5 NC NC NC STOP Spread Range Selection, VDD = 3.3 V CLKIN frequency 27MHz – 55MHz Spreading range ± 1.7% Modulation rate (CLKIN/1280) KHz Pin Description Pin# 1 2 3 4 Pin Name CLKIN VDD VSS ModOUT Type I P P O External reference frequency input. Power supply for the entire chip. Ground to entire chip. Description Spread spectrum clock output or reference output.( Refer Standby Mode Selection.) 5 6 7 8 STOP NC NC NC I - Active LOW signal. When HIGH, enables ModOUT and when LOW, ModOUT would be LOW. No connect. No connect. No connect. Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 2 of 8 February 2007 rev 1.4 Schematic for a Typical Application Input clock 27MHz – 55MHz VDD FB : Optional ferrite bead FB 0.1uF GND 4 EMI reduced clock output 27MHz – 55MHz ModOUT STOP 5 ASM3P2531A 1 2 3 CLKIN NC 8 7 6 VDD NC ASM3P2531A VSS NC VDD 0Ω 0Ω Use either pull-up or pull-down resistors with 0Ω Absolute Maximum Ratings Symbol VDD, VIN TSTG TA Ts TJ TDV Storage temperature Operating temperature Max. Soldering Temperature (10 sec) Junction Temperature Static Discharge Voltage (As per JEDEC STD22- A114-B) Parameter Voltage on any pin with respect to Ground Rating -0.5 to +4.6 -65 to +125 -40 to +85 260 150 2 Unit V °C °C °C °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. Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 3 of 8 February 2007 rev 1.4 DC Electrical Characteristics Symbol VIL VIH IIL IIH VOL VOH IDD ICC VDD tON ZOUT Input low voltage Input high voltage Input low current Input high current Output low voltage Output high voltage Dynamic supply current Operating voltage Power-up time (first locked cycle after power up) Clock output impedance VDD = 3.3V, IOL = 6 mA VDD = 3.3V, IOH = 15 mA 3.3V and 15pF loading 2.5 3.0 10 3.0 3.3 0.18 50 ASM3P2531A Parameter Min VSS - 0.3 2.0 Typ Max 0.8 VDD + 0.3 -35 35 0.4 Unit V V µA µA V V mA Static supply current standby mode 14 3.6 mA V mS Ω AC Electrical Characteristics Symbol fIN fOUT tLH 1 tHL 1 Parameter Input frequency Output frequency Output rise time Output fall time Jitter (Cycle to cycle) Output duty cycle Measured from 0.8 V to 2.0 V Measured from 2.0 V to 0.8 V Min 27 27 0.4 0.4 45 Typ Max 55 55 Unit MHz MHz nS nS pS % 0.6 0.6 50 1.2 1.2 360 55 tJC TD Note 1: tLH and tHL are measured into a capacitive load of 15pF Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 4 of 8 February 2007 rev 1.4 Package Information 8-lead (150-mil) SOIC Package ASM3P2531A E H D A2 A θ e B A 1 C L D Dimensions Symbol Min A1 A A2 B C D E e H L θ 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° Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 5 of 8 February 2007 rev 1.4 ASM3P2531A 8-lead Thin Shrunk Small Outline Package (4.40-MM Body) H E D A2 A θ e B A1 L C Dimensions Symbol Min A A1 A2 B c D E e H L θ 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° Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 6 of 8 February 2007 rev 1.4 Ordering Information Ordering Code ASM3P2531AF-08ST ASM3P2531AF-08SR ASM3I2531AF-08ST ASM3I2531AF-08SR ASM3P2531AF-08TT ASM3P2531AF-08TR ASM3I2531AF-08TT ASM3I2531AF-08TR ASM3P2531AG-08ST ASM3P2531AG-08SR ASM3I2531AG-08ST ASM3I2531AG-08SR ASM3P2531AG-08TT ASM3P2531AG-08TR ASM3I2531AG-08TT ASM3I2531AG-08TR ASM3P2531A Marking 3P2531AF 3P2531AF 3P2531AF 3P2531AF 3P2531AF 3P2531AF 3P2531AF 3P2531AF 3P2531AG 3P2531AG 3P2531AG 3P2531AG 3P2531AG 3P2531AG 3P2531AG 3P2531AG Package Type 8-pin 150mil SOIC –TUBE, Pb free 8-pin 150-mil SOIC -TAPE & REEL, Pb free 8-pin 150mil SOIC -TUBE, Pb free 8-pin 150-mil SOIC -TAPE & REEL, Pb free 8-pin 4.4mm TSSOP -TUBE, Pb free 8-pin 4.4mm TSSOP -TAPE & REEL, Pb free 8-pin 4.4mm TSSOP -TUBE, Pb free 8-pin 4.4mm TSSOP - TAPE & REEL, Pb free 8-pin 150mil SOIC –TUBE, Green 8-pin 150-mil SOIC -TAPE & REEL, Green 8-pin 150mil SOIC -TUBE, Green 8-pin 150-mil SOIC -TAPE & REEL, Green 8-pin 4.4mm TSSOP -TUBE, Green 8-pin 4.4mm TSSOP -TAPE & REEL, Green 8-pin 4.4mm TSSOP -TUBE, Green 8-pin 4.4mm TSSOP - TAPE & REEL, Green Operating Range Commercial Commercial Industrial Industrial Commercial Commercial Industrial Industrial Commercial Commercial Industrial Industrial Commercial Commercial Industrial Industrial Device Ordering Information ASM3P2531AF-08TR R = Tape & Reel, T = Tube or Tray O = SOT S = SOIC T = TSSOP A = SSOP V = TVSOP B = BGA Q = QFN DEVICE PIN COUNT F = LEAD FREE AND RoHS COMPLIANT PART G = GREEN PACKAGE, LEAD FREE, and RoHS DEVICE NUMBER X= Automotive I= Industrial P or n/c = Commercial (-40C to +125C) (-40C to +85C) (0C to +70C) 1 = Reserved 2 = Non PLL based 3 = EMI Reduction 4 = DDR support products 5 = STD Zero Delay Buffer 6 = Power Management 7 = Power Management 8 = Power Management 9 = Hi Performance 0 = Reserved U = MSOP E = TQFP L = LQFP U = MSOP P = PDIP D = QSOP X = SC-70 PulseCore Semiconductor Mixed Signal Product Licensed under US patent #5,488,627, #6,646,463 and #5,631,920. Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 7 of 8 February 2007 rev 1.4 ASM3P2531A 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: ASM3P2531A Document Version: v1.4 Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003 © Copyright 2007 PulseCore Semiconductor Corporation. All rights reserved. Our logo and name are trademarks or registered trademarks of PulseCore Semiconductor. All other 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 that 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 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. PulseCore 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 PulseCore 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 PulseCore’s Terms and Conditions of Sale (which are available from PulseCore). All sales of PulseCore products are made exclusively 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 intellectual property rights of PulseCore or third parties. 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 PulseCore 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. Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 8 of 8