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January 2005 rev 1.5
Low Power Peak EMI Reducing Solution
Features
Generates an EMI optimized clock signal at the output. Integrated loop filter components. Operates with a 3.3V /2.5V Supply. Operating current less than 6mA. Low power CMOS design. Input frequency range: 6MHz to 12MHz for 2.5V : 6MHz to 13MHz for 3.3V Generates a 1X low EMI spread spectrum clock of the input frequency. Frequency deviation: -1.25% (Typ) @ 10MHz Input Frequency Available in 6-pin TSOT-23, 8-pin SOIC and 8-pin TSSOP packages.
ASM3P2762A
The ASM3P2762A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method. The ASM3P2762A 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 ASM3P2762A is targeted towards all portable devices with very low power requirements like MP3 players and digital still cameras.
Product Description
The ASM3P2762A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. The ASM3P2762A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of all clock dependent signals. The ASM3P2762A allows significant system cost savings by reducing the number of circuit board layers ferrite beads, shielding that are traditionally required to pass EMI regulations.
Key Specifications
Description Supply voltages Cycle-to-Cycle Jitter Output Duty Cycle Modulation Rate Equation Frequency Deviation Specification VDD = 3.3V /2.5V 200 pS (Max) 45/55% (worst case) FIN/256 -1.25% (Typ) @ 10MHz
Block Diagram
VDD PD
XIN Crystal Oscillator Frequency Divider Feedback Divider
Modulation
PLL
XOUT
Phase Detector
Loop Filter
VCO
Output Divider
ModOUT
VSS
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.
January 2005 rev 1.5
Pin Configuration (6-pin TSOT-23 Package)
ASM3P2762A
PD 1 XOUT 2 XIN/CLKIN 3
6
VSS ModOUT VDD
ASM3P2762A
5 4
Pin#
1 2 3 4 5 6
Pin Name PD
XOUT XIN/CLKIN VDD ModOUT VSS
Type
I O I P O P
Description
Power-down control pin. Pull low to enable power-down mode. Connect to VDD if not used. Crystal connection. If using an external reference, this pin must be left unconnected. Crystal connection or external reference frequency input. This pin has dual functions. It can be connected either to an external crystal or an external reference clock. Power supply for the entire chip Spread spectrum clock output. Ground connection.
Low Power Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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January 2005 rev 1.5
DC Electrical Characteristics for 3.3V Supply
(Test condition: All parameters are measured at room temperature (+ 25C) unless otherwise stated)
ASM3P2762A
Symbol
VIL VIH IIL IIH IXOL IXOH VOL VOH IDD ICC VDD tON ZOUT Input low voltage Input high voltage Input low current Input high current
Parameter
Min
GND - 0.3 2.0 - - - 2.5 - - 2.7 - -
Typ
- - - - 3 3 - - - 3 3.3 - 45
Max
0.8 VDD + 0.3 -35 35 0.4 - 10 - 3.6 5 -
Unit
V V LA LA mA mA V V uA mA V mS O
XOUT output low current (@0.4V, VDD=3.3V) XOUT output high current (@2.5V, VDD=3.3V) Output low voltage (VDD = 3.3 V, IOL = 8 mA) Output high voltage (VDD = 3.3 V, IOH = 8 mA) Static supply current* Dynamic supply current (3.3V, 10MHz and no load) Operating voltage Power-up time (first locked cycle after power-up)** Output impedance
* PD pin is pulled low ** VDD and XIN/CLKIN input are stable, PD pin is made high from low.
AC Electrical Characteristics for 3.3V Supply
Symbol CLKIN ModOUT fd tLH* tHL * tJC tD Input frequency Output frequency Frequency Deviation Input Frequency = 6MHz Input Frequency = 13MHz Parameter Min 6 6 - - 0.5 0.4 - 45 Typ - - - - 1.0 0.9 - 50 Max 13 13 -1.75 -0.89 1.4 1.2 200 55 Unit MHz MHz % nS nS pS %
Output rise time (measured from 0.8 to 2.0V) Output fall time (measured at 2.0V to 0.8V) Jitter (cycle to cycle) Output duty cycle
*tLH and tHL are measured into a capacitive load of 15pF
Low Power Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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January 2005 rev 1.5
Typical Crystal Oscillator Circuit
ASM3P2762A
Crystal
R1 = 510O
C1 = 27 pF
C2 = 27 pF
Typical Crystal Specifications
Fundamental AT cut parallel resonant crystal Nominal frequency Frequency tolerance Operating temperature range Storage temperature Load capacitance Shunt capacitance ESR 8.000 MHz 50 ppm or better at 25C -25C to +85C -40C to +85C 18pF 7pF maximum 25
Low Power Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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January 2005 rev 1.5
Package Information 6-pin TSOT-23 Package
ASM3P2762A
Dimensions Symbol Min A A1 A2 b H D B e C L S 0.0118 0 0.00 0.033 0.012 0.005 BSC 0.114 BSC 0.06 BSC 0.0374 BSC 0.11 BSC 0.02 4 0.30 0 Inches Max 0.04 0.004 0.036 0.02 0.00 0.84 0.30 0.127 BSC 2.90 BSC 1.60 BSC 0.950 BSC 2.80 BSC 0.50 4 Min Millimeters Max 1.00 0.10 0.90 0.50
Low Power Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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January 2005 rev 1.5
8-Pin SOIC Package
ASM3P2762A
E
H
D
A2
A C
e B
A 1
D
L
Dimensions Symbol Min A1 A A2 B C D E e H L S 0.004 0.053 0.049 0.012 0.007 Inches Max 0.010 0.069 0.059 0.020 0.010 Millimeters Min 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 Max 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 Power Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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January 2005 rev 1.5
8-Pin TSSOP Package
ASM3P2762A
H
E D A2 A C e B A1 L
Dimensions Symbol Min A A1 A2 B c D E e H L S 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 0.65 BSC 6.40 BSC 0.70 8 Min Millimeters Max 1.10 0.15 0.95 0.30 0.20 3.10 4.50
Low Power Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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January 2005 rev 1.5
Ordering Information Part Number
ASM3P2762AF-06OR ASM3P2762AF-08TT ASM3P2762AF-08TR ASM3P2762AF-08ST ASM3P2762AF-08SR ASM3P2762A-06OR ASM3P2762A-08TT ASM3P2762A-08TR ASM3P2762A-08ST ASM3P2762A-08SR
ASM3P2762A
Marking
I4LL 3P2762AFT 3P2762AFT 3P2762AFS 3P2762AFS I1LL 3P2762AT 3P2762AT 3P2762AS 3P2762AS
Package Type
6-Pin TSOT-23, TAPE & REEL, Pb Free 8-Pin TSSOP, TUBE, Pb Free 8-Pin TSSOP, TAPE & REEL, Pb Free 8-Pin SOIC, TUBE, Pb Free 8-Pin SOIC, TAPE & REEL, Pb Free 6-Pin TSOT-23, TAPE & REEL 8-Pin TSSOP, TUBE 8-Pin TSSOP, TAPE & REEL 8-Pin SOIC, TUBE 8-Pin SOIC, TAPE & REEL
Temperature
Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial
Device Ordering Information
ASM3P2762AF-08TR
OR - TSOT23-6, T/R TT - TSSOP, TUBE TR - TSSOP, T/R VT - TVSOP, TUBE VR - TVSOP, T/R ST - SOIC, TUBE SR - SOIC, T/R QR - QFN, T/R QT - QFN, TUBE BT - BGA, TUBE BR - BGA, T/R
PIN COUNT LEAD FREE PART PART NUMBER X = Automotive (-40C to +125C) I = Industrial (-40C to +85C) P or n/c = Commercial (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
Alliance Semiconductor Mixed Signal Product
Licensed under U.S Patent Nos 5,488,627 and 5,631,921
Low Power Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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January 2005 rev 1.5
ASM3P2762A
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: ASM3P2762A Document Version: v1.5
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.
Low Power Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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