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October 2006
rev 0.3 Low Power Peak EMI Reducing Solution
Features
* * * * * * Generates a 1X low EMI optimized clock signal at the output. Integrated loop filter components. Operates with a 3.3 / 2.5V Supply. Operating current less than 5mA. Low power CMOS design. Input frequency range 60MHz to 120MHz for 2.5V 60MHz to 120MHz for 3.3V * * Frequency deviation: 1.5(Typ) @85MHz Output frequency. Available in 6-pin TSOT-23 Package.
ASM3P2598A
The ASM3P2598A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method. The ASM3P2598A 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 ASM3P2598A is targeted towards all portable devices with very low power requirements like MP3 players,MFP, LCD Panel Module and digital still cameras.
Product Description
The ASM3P2598A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. The ASM3P2598A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of all clock dependent signals. The ASM3P2598A 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 360pS (Typ) 45/55% FIN/2560 1.5% (Typ) @85MHz Output
Block Diagram
VDD
SSON
Modulation CLKIN 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.
October 2006
rev 0.3
Pin Configuration (6-pin TSOT- 23 Package)
ASM3P2598A
SSON NC
1 2
6
VSS ModOUT VDD
ASM3P2598A
5 4
CLKIN 3
Pin Description Pin#
1 2 3 4 5 6
Pin Name
SSON NC CLKIN VDD ModOUT VSS
Type
I 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. No Connect Clock Input Power supply for the entire chip. Spread spectrum clock output. Ground connection.
Modulation Profile
Specifications Description
Frequency Range Modulation Equation Frequency Deviation For 2.5V Supply For 3.3V Supply
Specification
60MHz < CLKIN < 120MHz 60MHz < CLKIN < 120MHz FIN/2560 1.5% (Typ) @ 85MHz Output
Low Power Peak EMI Reducing Solution
Notice: The information in this document is subject to change without notice.
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October 2006
rev 0.3
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)
ASM3P2598A
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.
DC Electrical Characteristics for 2.5V Supply 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 (VDD = 2.5V, IOL = 8 mA) Output high voltage (VDD = 2.5V, IOH = 8 mA) Static supply current* Dynamic supply current (2.5V, 85MHz and no load) Operating voltage Power-up time (first locked cycle after power-up) Output impedance
Parameter
Min
VSS - 0.3 2.0 - - - 1.8 - - 2.375 - -
Typ
- - - - - - 1.8 4.0 2.5 - 50
Max
0.8 VDD + 0.3 -35 35 0.6 - - - 2.625 5 -
Unit
V V A A V V mA mA V mS
* 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 Input Frequency = 60MHz Input Frequency = 120MHz
Parameter
Min
60 60 - - 0.7 0.4 - 45
Typ
- - 1.6 1.1 1.8 0.9 360 50
Max
120 120 - - 2.6 1.1 - 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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October 2006
rev 0.3
DC Electrical Characteristics for 3.3V Supply 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 (VDD = 3.3V, IOL = 8 mA) Output high voltage (VDD = 3.3V, IOH = 8 mA) Static supply current* Dynamic supply current (3.3V, 85MHz and no load) Operating voltage Power-up time (first locked cycle after power-up) Output impedance
ASM3P2598A
Parameter
Min
VSS - 0.3 2.0 - - - 2.5 - - 3.0 - -
Typ
- - - - - - 2.2 4.5 3.3 - 45
Max
0.8 VDD + 0.3 -35 35 0.4 - - - 3.6 5 -
Unit
V V A A V V mA mA V mS
* 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 Input Frequency = 60MHz Input Frequency = 120MHz
Parameter
Min
60 60 - - 0.5 0.3 - 45
Typ
- - 1.6 1.1 1.2 0.8 360 50
Max
120 120 - - 1.8 1.1 - 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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October 2006
rev 0.3
Package Information 6-pin TSOT-23 Package
ASM3P2598A
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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October 2006
rev 0.3
Ordering Information Part Number
ASM3P2598AF-06-OR ASM3P2598AG-06-OR ASM3I2598AF-06-OR ASM3I2598AG-06-OR
ASM3P2598A
Marking
A11 A12 A14 A15
Package Type
6-Pin TSOT-23, TAPE & REEL, Pb Free 6-Pin TSOT-23, TAPE & REEL, Green 6-Pin TSOT-23, TAPE & REEL, Pb Free 6-Pin TSOT-23, TAPE & REEL, Green
Temperature
Commercial Commercial Industrial Industrial
Device Ordering Information
ASM3P2598AG-06-0R
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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October 2006
rev 0.3
ASM3P2598A
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 Preliminary Information Part Number: ASM3P2598A 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 2006 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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