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January 2007 rev 0.3 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 4mA. Low power CMOS design. Input frequency : 12MHz Generates a 1X low EMI spread spectrum clock of the input frequency. Frequency deviation: 0.4%(Typ) @ 12MHz Input Frequency Available in 6-pin TSOT-23, 8-pin SOIC and 8pin TSSOP packages.
ASM3P2863A
The ASM3P2863A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method. The ASM3P2863A 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 ASM3P2863A is targeted towards all portable devices with very low power requirements like MP3 players, Notebooks and Digital still cameras.
Product Description
The ASM3P2863A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. The ASM3P2863A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of all clock dependent signals. The ASM3P2863A 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 = 2.5V / 3.3V 200 pS ( Max) 45/55% (worst case) FIN/256 0.4 % (Typ) @ 12MHz
Block Diagram
VDD
XIN XOUT Crystal Oscillator Frequency Divider Feedback Divider REFOUT
Modulation
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.
January 2007 rev 0.3
Pin Configuration (6-pin TSOT- 23 Package)
ASM3P2863A
REFOUT 1 XOUT 2 XIN / CLKIN 3
6
VSS ModOUT VDD
ASM3P2863A
5 4
Pin Description Pin#
1 2 3 4 5 6
Pin Name
REFOUT XOUT XIN / CLKIN VDD ModOUT VSS
Type
O O I P O P
Description
Buffered output of the input frequency. 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)
ASM3P2863A
XIN / CLKIN 1 XOUT 2 REFOUT 3 NC 4
8 7 6 5
VDD NC ModOUT VSS
ASM3P2863A
Pin Description Pin#
1 2 3 4 5 6 7 8
Pin Name
XIN / CLKIN XOUT REFOUT NC VSS ModOUT NC VDD
Type
I O O 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. Buffered output of the input frequency. No connect. Ground connection. Spread spectrum clock output. No connect. Power supply for the entire chip
Modulation Profile
Specifications Description
Input Frequency Modulation Equation Frequency Deviation
Specification
12MHz FIN/256 0.4% ( Typ ) @ 12MHz
Low Power Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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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)
ASM3P2863A
Parameter
Voltage on any pin with respect to Ground
Rating
-0.5 to +4.6 -65 to +125 0 to 70 260 150 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.
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 - - 0.8 3 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 = 2.5V, IOL = 8 mA) Output high voltage (VDD = 2.5V, IOH = 8 mA) Static supply current Dynamic supply current (2.5V, 12MHz and no load) Operating voltage Power-up time (first locked cycle after power-up) Output impedance
* XIN / CLKIN pin is pulled low
AC Electrical Characteristics for 2.5V Supply Symbol
CLKIN ModOUT fd tLH* tHL* tJC tD Input frequency Output frequency Frequency Deviation 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
Parameter
Min
0.5 0.5 45
Typ
12 12 0.4 1.5 1.0 200 50
Max
1.7 1.2 55
Unit
MHz MHz % nS nS pS %
* 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)
ASM3P2863A
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 - - 3.0 - -
Typ
- - - - 3 3 - - 1 3.5 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 = 3.3V, IOL = 8 mA) Output high voltage (VDD = 3.3V, IOH = 8 mA) Static supply current Dynamic supply current (3.3V, 12MHz and no load) Operating Voltage Power-up time (first locked cycle after power-up) Output impedance
* XIN / CLKIN pin is pulled low
AC Electrical Characteristics for 3.3V Supply Symbol
CLKIN ModOUT fd tLH* tHL* tJC tD Input frequency Output frequency Frequency Deviation 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
Parameter
Min
- - - 0.5 0.4 - 45
Typ
12 12 0.4 1.4 1.0 200 50
Max
- - - 1.6 1.2 - 55
Unit
MHz MHz % nS nS pS %
*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
ASM3P2863A
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 12.000 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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Package Information 6-pin TSOT-23 Package
ASM3P2863A
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
..... 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 1.00 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
ASM3P2863A
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
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
8-Pin TSSOP Package
Low Power Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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ASM3P2863A
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
Millimeters Min
..... 0.05 0.85 0.19 0.09 2.90 4.30 0.65 BSC 6.40 BSC 0.70 8
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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Ordering Information Part Number
ASM3P2863AF-06OR ASM3P2863AF-08TT ASM3P2863AF-08TR ASM3P2863AF-08ST ASM3P2863AF-08SR ASM3P2863AG-06OR ASM3P2863AG-08TT ASM3P2863AG-08TR ASM3P2863AG-08ST ASM3P2863AG-08SR
ASM3P2863A
Marking
V4LL 3P2863AF 3P2863AF 3P2863AF 3P2863AF V3LL 3P2863AG 3P2863AG 3P2863AG 3P2863AG
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, 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
Device Ordering Information
ASM3P2863AF-08TR
R = Tape & Reel, T = Tube or Tray O = TSOT23 S = SOIC T = TSSOP A = SSOP V = TVSOP B = BGA Q = QFN U = MSOP E = TQFP L = LQFP U = MSOP P = PDIP D = QSOP X = SC-70 J=TSOT26
DEVICE PIN COUNT F = LEAD FREE AND RoHS COMPLIANT PART G = GREEN PACKAGE, LEAD FREE, and RoHS 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
PulseCore 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 2007 rev 0.3
ASM3P2863A
PulseCore Semiconductor Corporation 1715 S. Bascom Ave Suite 200 Campbell, CA 95008 Tel: 408-879-9077 Fax: 408-879-9018 www.pulsecoresemi.com
Copyright (c) PulseCore Semiconductor All Rights Reserved Part Number: ASM3P2863A Document Version: 0.3
Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003
(c) 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 Power Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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