Generates optimized clocking signal output. Integrated loop filter com

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Generates optimized clocking signal output. Integrated loop filter com

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Power Peak Reducing Solution
Generates optimized clocking signal output. Integrated loop filter components. Operates with 3.3V ±10% supply. Operating current less than 4mA. power CMOS design. Input frequency range: 15MHz 30MHz. Generates spread spectrum clock input frequency. Frequency deviation: -1.25%. Available 6-pin TSOT-23, 8-pin SOIC 8-pin TSSOP packages.
ASM3P2879A
ASM3P2879A uses most efficient optimized modulation profile approved implemented using proprietary digital method. ASM3P2879A modulates output single order "spread" bandwidth synthesized clock, more importantly, decreases peak amplitudes harmonics. This results significantly lower system compared typical narrow band signal produced oscillators most frequency generators. Lowering increasing signal's bandwidth called `spread spectrum clock generation'.
Applications
ASM3P2879A targeted towards portable devices with very power requirements like players, Notebooks digital still cameras.
Product Description
ASM3P2879A versatile spread spectrum frequency modulator designed specifically wide range clock frequencies. ASM3P2879A reduces electromagnetic interference (EMI) clock source, allowing system wide reduction clock dependent signals. ASM3P2879A allows significant system cost savings reducing number circuit board layers ferrite beads, shielding that traditionally required pass regulations.
Specifications
Description Supply voltages Frequency Range Cycle-to-Cycle Jitter Output Duty Cycle Output Rise Fall Time Modulation Rate Equation Frequency Deviation Specification 3.3V ±10% 15MHz CLKIN 30MHz (maximum) 40/60% (worst case) (maximum) FIN/640
Block Diagram
Modulation Crystal Oscillator XOUT Frequency Divider Feedback Divider
Phase Detector
Loop Filter
Output Divider ModOUT
REFOUT
Alliance Semiconductor 2575, Augustine Drive Santa Clara, Tel: 408.855.4900 Fax: 408.855.4999 www.alsc.com
Notice: information this document subject change without notice.
Configuration (6-pin TSOT-23)
REFOUT XOUT XIN/CLKIN
ASM3P2879A
ModOUT
ASM3P2879A
Pin#
Name REFOUT XOUT XIN/CLKIN ModOUT
Type
Description Buffered output input frequency. Crystal connection. using external reference, this must left unconnected. Crystal connection external reference frequency input. This dual functions. connected either external crystal external reference clock. Power supply entire chip (3.3V) Spread spectrum clock output. Ground connection.
Power Peak Reducing Solution
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Configuration (8-pin SOIC TSSOP)
XIN/CLKIN XOUT
ASM3P2879A
ModOUT
ASM3P2879A
REFOUT
Description Pin# Name XIN/CLKIN XOUT REFOUT ModOUT Type Description Crystal connection external reference frequency input. This dual functions. connected either external crystal external reference clock. Crystal connection. using external reference, this must left unconnected. Buffered output input frequency. connect. Ground connection. Spread spectrum clock output. connect. Power supply entire chip (3.3V)
Modulation Profile
Specification Description Frequency Range Modulation Equation Frequency Deviation
Specification 15MHz CLKIN 30MHz /640
Power Peak Reducing Solution
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Absolute Maximum Ratings Symbol TSTG Parameter
ASM3P2879A
Rating
Unit
Voltage with respect Ground +7.0 Storage temperature +125 Operating temperature Note: These stress ratings only implied functional use. Exposure absolute maximum ratings prolonged periods time affect device reliability.
Electrical Characteristics Symbol IXOL IXOH ZOUT Input voltage Input high voltage Input current Input high current XOUT output current (@4.0V, =3.3V) XOUT output high current (@2.5V, =3.3V) Output voltage (VDD Output high voltage (VDD Static supply current Dynamic supply current (3.3V, 30MHz 10pF loading) Operating voltage Power-up time (first locked cycle after power Clock output impedance Parameter 0.18 Unit
Electrical Characteristics Symbol CLKIN ModOUT REFOUT Input frequency Output frequency Output rise time (measured 0.8V 2.0V) Output fall time (measured 2.0V 0.8V) Jitter (cycle cycle) Parameter Unit
Output duty cycle *tLH measured into capacitive load 15pF
Power Peak Reducing Solution
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Package Information 6-pin TSOT-23
ASM3P2879A
Symbol
Dimensions millimeters 1.00 0.10 0.87 1.40 0.30 2.50 2.70 0.95 0.10 0.20 0.35 1.80 0.50 3.00 3.10
Dimensions inches 0.040 0.004 0.034 0.055 0.012 0.098 0.106 0.071 0.019 0.118 0.122
0.037 0.004 0.014
0.008
Power Peak Reducing Solution
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ASM3P2879A
8-Pin SOIC
Symbol
Dimensions inches 0.071 0.010 0.069 0.020 0.01 0.202 0.164
Dimensions millimeters 1.45 0.10 1.35 0.31 0.10 4.72 3.75 1.80 0.25 1.75 0.51 0.25 5.12 4.15 1.27 5.70 0.30 6.30 0.70
0.057 0.004 0.053 0.012 0.004 0.186 0.148
0.050 0.224 0.012 0.248 0.028
Power Peak Reducing Solution
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8-Pin TSSOP
ASM3P2879A
Dimensions inches Symbol 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
Dimensions millimeters 1.10 0.05 0.80 0.19 0.09 2.90 4.30 0.65 6.20 0.45 6.60 0.75 0.15 1.05 0.30 0.20 3.10 4.50
0.026 0.244 0.018 0.260 0.030
Power Peak Reducing Solution
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Ordering Information Part Number ASM3P2879AF-06OR ASM3P2879AF-08TT ASM3P2879AF-08TR ASM3P2879AF-08ST ASM3P2879AF-08SR Device Ordering Information Marking D1LL ASM3P2879A ASM3P2879A ASM3P2879A ASM3P2879A Package Type 6-Pin TSOT-23, TAPE REEL 8-Pin TSSOP, TUBE 8-Pin TSSOP, TAPE REEL 8-Pin SOIC, TUBE 8-Pin SOIC, TAPE REEL
ASM3P2879A
Temperature
SOT23/T/R TSSOP, TUBE TSSOP, TVSOP, TUBE TVSOP, SOIC, TUBE SOIC, QFN, QFN, TUBE BGA, TUBE BGA,
COUNT
LEAD FREE PART
PART NUMBER
Automotive
Industrial
Commercial
reserved based Reduction support products Zero Delay Buffer
power management power management power management performance reserved
Alliance Semiconductor Mixed Signal Product
Licensed under Patent 5,488,627 5,631,921
Power Peak Reducing Solution
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ASM3P2879A
Alliance Semiconductor Corporation 2575, Augustine Drive, Santa Clara, 95054 Tel# 408-855-4900 Fax: 408-855-4999 www.alsc.com
Copyright Alliance Semiconductor Rights Reserved Preliminary Information Part Number: ASM3P2879A Document Version: 8_30_2004
Note: This product utilizes Patent 6,646,463 Impedance Emulator Patent issued Alliance Semiconductor, dated 11-11-2003
Copyright 2003 Alliance Semiconductor Corporation. rights reserved. three-point logo, name Intelliwatt trademarks registered trademarks Alliance. other brand product names trademarks their respective companies. Alliance reserves right make changes this document products time without notice. Alliance assumes responsibility errors that appear this document. data contained herein represents Alliance's best data and/or estimates time issuance. Alliance reserves right change correct this data time, without notice. product described herein under development, significant changes these specifications possible. information this product data sheet intended general descriptive information potential customers users, intended operate provide, guarantee warrantee user customer. Alliance does assume responsibility liability arising application product described herein, disclaims express implied warranties related sale and/or Alliance products including liability warranties related fitness particular purpose, merchantability, infringement intellectual property rights, except express agreed Alliance's Terms Conditions Sale (which available from Alliance). sales Alliance products made exclusively according Alliance's Terms Conditions Sale. purchase products from Alliance does convey license under patent rights, copyrights; mask works rights, trademarks, other intellectual property rights Alliance third parties. Alliance does authorize products critical components life-supporting systems where malfunction failure reasonably expected result significant injury user, inclusion Alliance products such life-supporting systems implies that manufacturer assumes risk such agrees indemnify Alliance against claims arising from such use.
Power Peak Reducing Solution
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