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August 2005 rev 1.0 Low Power Peak EMI Reducing Solution
Features
Generates an EMI optimized clock signal at the output. Integrated loop filter components. Operates with a 3.3 / 2.5V Supply. Operating current less than 4mA. Low power CMOS design. Input frequency range: 12MHz to 30MHz for 2.5V : 12MHz to 30MHz for 3.3V Generates a 1X low EMI spread spectrum clock of the input frequency. Spread Spectrum Enable Control. Frequency deviation: 1% @ 24MHz Available in 6 pin TSOT-23, 8 pin SOIC and 8 pin TSSOP Packages.
ASM3P2579A
The ASM3P2579A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method. The ASM3P2579A 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 ASM3P2579A is targeted towards all portable devices with very low power requirements like MP3 players and digital still cameras.
Product Description
The ASM3P2579A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. The ASM3P2579A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of all clock dependent signals. The ASM3P2579A 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 200pS (Max) 45/55% (worst case) FIN/640 1% @ 24MHz
Block Diagram
VDD SSON
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.
August 2005 rev 1.0
Pin Configuration (6-pin TSOT-23 Package)
ASM3P2579A
SSON XOUT XIN/CLKIN
1 2 3
6
VSS ModOUT VDD
ASM3P2579A
5 4
Pin Description Pin#
1 2 3 4 5 6
Pin Name
SSON XOUT XIN/CLKIN VDD ModOUT VSS
Type
I O I P O P
Description
When SSON is HIGH, the spread spectrum is enabled and when LOW, it turns off the spread spectrum. Connect the pin to ground When Spread Spectrum feature is not required. 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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Pin Configuration (8-pin SOIC and TSSOP Packages)
ASM3P2579A
XIN/CLKIN XOUT SSON
1 2 3
8 7 6 5
VDD NC ModOUT VSS
ASM3P2579A
NC 4
Pin Description Pin#
1 2 3 4 5 6 7 8
Pin Name
XIN/CLKIN XOUT
Type
I O I P O P
Description
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. Crystal connection. If using an external reference, this pin must be left unconnected. When SSON is HIGH, the spread spectrum is enabled and when LOW, it turns off the spread spectrum. Connect the pin to ground When Spread Spectrum feature is not required. No connect. Ground connection. Spread spectrum clock output. No connect. Power supply for the entire chip
SSON
NC VSS ModOUT NC VDD
Modulation Profile
Specifications Description
Frequency Range Modulation Equation Frequency Deviation
Specification
12MHz < CLKIN < 30MHz FIN/640 1% @ 24MHz
Low Power Peak EMI Reducing Solution
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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)
ASM3P2579A
Parameter
Rating
-0.5 to +7.0 -65 to +125 0 to 70 260 150 2
Unit
V C C C C KV
Voltage on any pin with respect to Ground
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.
DC Electrical Characteristics for 2.5V Supply
(Test condition: All parameters are measured at room temperature (+25C) unless otherwise stated)
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
VSS - 0.3 2.0 1.8 2.375 -
Typ
3 3 1.1 3.5 2.5 50
Max
0.8 VDD + 0.3 -35 35 0.6 2.625 5 -
Unit
V V A A mA mA V V mA mA V mS
XOUT output low current (@0.5V, VDD=2.5V) XOUT output high current (@1.8V, VDD=2.5V) Output low voltage (VDD = 2.5 V, IOL = 8mA) Output high voltage (VDD = 2.5 V, IOH = 8mA) Static supply current * Dynamic supply current (2.5V, 24MHz and no load) Operating Voltage Power-up time (first locked cycle after power-up) Output impedance
* XIN/CLKIN is made low.
AC Electrical Characteristics for 2.5V Supply Symbol
CLKIN ModOUT fd tLH* tHL* tJC tD Input frequency Output frequency Frequency Deviation Input Frequency = 12MHz Input Frequency = 30MHz
Parameter
Min
12 12 0.7 0.4 45
Typ
1.5 1.0 50
Max
30 30 1.65 0.80 1.9 1.1 200 55
Unit
MHz MHz % nS nS pS %
Output rise time (measured from 0.7V to 1.7V) Output fall time (measured from 1.7V to 0.7V) 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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DC Electrical Characteristics for 3.3V Supply
(Test condition: All parameters are measured at room temperature (+25C) unless otherwise stated)
ASM3P2579A
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
VSS - 0.3 2.0 2.5 2.7 -
Typ
3 3 1.2 4.0 3.3 45
Max
0.8 VDD + 0.3 -35 35 0.4 3.6 5 -
Unit
V V A A mA mA V V mA mA V mS
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 = 8mA) Output high voltage (VDD = 3.3 V, IOH = 8mA) Static supply current* Dynamic supply current (3.3V, 24MHz and no load) Operating Voltage Power-up time (first locked cycle after power-up) Output impedance
* XIN/CLKIN is made low.
AC Electrical Characteristics for 3.3V Supply Symbol
CLKIN ModOUT fd tLH* tHL* tJC tD Input frequency Output frequency Frequency Deviation Input Frequency = 12MHz Input Frequency = 30MHz
Parameter
Min
12 12 0.5 0.4 45
Typ
1.4 1.0 50
Max
30 30 1.65 0.80 1.7 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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Typical Crystal Oscillator Circuit
ASM3P2579A
Crystal
R1 = 510
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 14.31818MHz 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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Package Information 6-pin TSOT-23 Package
ASM3P2579A
Dimensions Symbol Min
A A1 A2 b H D B e C L 0.00 0.033 0.012
Inches Max
0.04 0.004 0.036 0.02
Millimeters Min Max
1.00 0.00 0.84 0.30 0.127 BSC 2.90 BSC 1.60 BSC 0.950 BSC 2.80 BSC 0.30 0 0.50 4 0.10 0.90 0.50
0.005 BSC 0.114 BSC 0.06 BSC 0.0374 BSC 0.11 BSC 0.0118 0 0.02 4
Low Power Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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8-Pin SOIC Package
ASM3P2579A
E
H
D
A2
A
e B A 1
C L
D
Dimensions
Symbol Min
A1 A A2 B C D E e H L
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 Power Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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8-Pin TSSOP Package
ASM3P2579A
H
E D A2 A e B A1 L C
Dimensions Symbol Min
A A1 A2 B c D E e H L 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 Power Peak EMI Reducing Solution
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Ordering Information Part Number
ASM3P2579AF-06OR ASM3P2579AF-08TT ASM3P2579AF-08TR ASM3P2579AF-08ST ASM3P2579AF-08SR ASM3P2579A-06OR ASM3P2579A-08TT ASM3P2579A-08TR ASM3P2579A-08ST ASM3P2579A-08SR ASM3P2579AG-06OR ASM3P2579AG-08TT ASM3P2579AG-08TR ASM3P2579AG-08ST ASM3P2579AG-08SR ASM3I2579AF-06OR ASM3I2579AF-08TT ASM3I2579AF-08TR ASM3I2579AF-08ST ASM3I2579AF-08SR ASM3I2579A-06OR ASM3I2579A-08TT ASM3I2579A-08TR ASM3I2579A-08ST ASM3I2579A-08SR ASM3I2579AG-06OR ASM3I2579AG-08TT ASM3I2579AG-08TR ASM3I2579AG-08ST ASM3I2579AG-08SR
ASM3P2579A
Marking
S4LL 3P2579AF 3P2579AF 3P2579AF 3P2579AF S1LL 3P2579A 3P2579A 3P2579A 3P2579A S3LL 3P2579AG 3P2579AG 3P2579AG 3P2579AG S5LL 3I2579AF 3I2579AF 3I2579AF 3I2579AF S2LL 3I2579A 3I2579A 3I2579A 3I2579A S6LL 3I2579AG 3I2579AG 3I2579AG 3I2579AG
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 6-Pin TSOT-23, TAPE & REEL, Green 8-Pin TSSOP, TUBE, Green 8-Pin TSSOP, TAPE & REEL, Green 8-Pin SOIC, TUBE, Green 8-Pin SOIC, TAPE & REEL, Green 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 6-Pin TSOT-23, TAPE & REEL, Green 8-Pin TSSOP, TUBE, Green 8-Pin TSSOP, TAPE & REEL, Green 8-Pin SOIC, TUBE, Green 8-Pin SOIC, TAPE & REEL, Green
Temperature
Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Industrial Industrial Industrial Industrial Industrial Industrial Industrial Industrial Industrial Industrial Industrial Industrial Industrial Industrial Industrial
Low Power Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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Device Ordering Information
ASM3P2579A
ASM3P2579AF-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 PART 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
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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ASM3P2579A
Alliance Semiconductor Corporation 2575 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: ASM3P2579A Document Version: v1.0
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
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