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ASM3P2669A Peak EMI Reducing Solution
Features
* Generates a 1X low EMI spread spectrum clock of the input frequency. * Integrated loop filter components. * Operates with a 3.3V / 2.5V supply. * Operating current less than 4mA. * CMOS design. * Input frequency range: 6MHz to 12MHz for 2.5V 6MHz to 13MHz for 3.3V * Frequency deviation: 1% @ 10MHz * 6L-TSOP (6L-TSOT-23) system cost savings by reducing the number of circuit board layers, ferrite beads and shielding that are traditionally required to pass EMI regulations. The ASM3P2669A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method. The ASM3P2669A 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.'
Product Description
The ASM3P2669A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. The ASM3P2669A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of all clock dependent signals. The ASM3P2669A allows significant
Application
The ASM3P2669A is targeted towards all portable devices like MP3 players and digital still cameras.
Block Diagram
VDD PD
Modulation CLKIN Frequency Divider Feedback Divider
PLL
Phase Detector
Loop Filter
VCO
Output Divider
ModOUT
VSS
(c)2010 SCILLC. All rights reserved. JANUARY 2010 - Rev. 2
Publication Order Number: ASM3P2669/D
ASM3P2669A
Pin Configuration (6L- TSOP Package)
PD 1 NC 2 CLKIN 3 ASM3P2669A
6 5
VSS ModOUT VDD
4
Pin Description Pin#
1 2 3 4 5 6
Pin Name
PD NC CLKIN VDD ModOUT VSS
Type
I I P O P
Description
Power-down control pin. Pull low to enable power-down mode. Connect to VDD if not used. No connect. External reference clock input. Power supply for the entire chip. Spread spectrum clock output. Ground connection.
Specifications VDD (V)
2.5 3.3
Frequency Range (MHz)
6-12 6-13
Modulation Rate
FIN/256
Absolute Maximum Ratings Symbol
VDD, VIN TSTG Ts TJ TDV Storage temperature
Parameter
Rating
-0.5 to +4.6 -65 to +125 260 150 2
Unit
V C C C KV
Voltage on any pin with respect to Ground Max. Soldering Temperature (10 sec) Junction Temperature Static Discharge Voltage (As per JEDEC STD22- A114-B)
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.
Operating Conditions Parameter
VDD TA CL CIN Supply Voltage Operating Temperature (Ambient Temperature) Load Capacitance Input Capacitance
Description
Min
2.375 -40
Max
3.6 +85 15 7
Unit
V C pF pF
Rev. 2 | Page 2 of 7 | www.onsemi.com
ASM3P2669A
DC Electrical Characteristics for 2.5V Supply Symbol Parameter
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 = 2.5 V, IOL = 8mA) Output high voltage (VDD = 2.5 V, IOH = 8mA) Static supply current Operating voltage Power-up time (first locked cycle after power-up) Output impedance
2 1
Min
VSS-0.3 2.0
Typ
Max
0.8 VDD+0.3 -35 35 0.6
Unit
V V A A V V uA mA V mS
1.8 10 2 2.375 2.5 40 2.5 2.625 5
Dynamic supply current (Unloaded Output)
Notes: 1. XIN / CLKIN pin and PD pin are pulled low. 2. VDD and XIN / CLKIN input are stable, PD pin is made high from low.
AC Electrical Characteristics for 2.5V Supply Symbol
CLKIN ModOUT Input frequency Output frequency CLKIN = 6MHz fd
1 tLH
Parameter
Min
6 6
Typ
Max
12 12
Unit
MHz MHz
1.25 1 0.9 0.9 0.6 45 1.7 1 50 250 2.5 1.5 55 400 nS nS % pS %
Frequency Deviation
CLKIN = 10MHz CLKIN = 12MHz
Output Rise time (measured from 0.7V to 1.7V) Output Fall time (measured from 1.7V to 0.7V) Output Duty Cycle Cycle-to-Cycle Jitter
tHL
1
tD tJC
Note: 1. tLH and tHL are measured into a capacitive load of 15pF.
Rev. 2 | Page 3 of 7 | www.onsemi.com
ASM3P2669A
DC Electrical Characteristics for 3.3V Supply Symbol Parameter
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 = 3.3 V, IOL = 8mA) Output high voltage (VDD = 3.3 V, IOH = 8mA) Static supply current Operating voltage Power-up time (first locked cycle after power-up) Output impedance
2 1
Min
VSS-0.3 2.0
Typ
Max
0.8 VDD+0.3 -35 35 0.4
Unit
V V A A V V uA mA V mS
2.5 2.5 2.7 3.3 35
10 3 3.6 5
Dynamic supply current (Unloaded Output)
Notes: 1. XIN / CLKIN pin and PD pin are pulled low. 2. VDD and XIN / CLKIN input are stable, PD pin is made high from low.
AC Electrical Characteristics for 3.3V Supply Symbol
CLKIN ModOUT Input frequency Output frequency CLKIN = 6MHz fd Frequency Deviation CLKIN = 10MHz CLKIN = 13MHz
1 tLH
Parameter
Min
6 6
Typ
Max
13 13
Unit
MHz MHz
1.25 1 0.9 0.7 0.6 45 1.3 0.9 50 300 1.7 1.3 55 450 nS nS % pS %
Output Rise time (measured from 0.8V to 2.0V) Output Fall time (measured at 2.0V to 0.8V) Output Duty Cycle Cycle - Cycle Jitter
tHL
1
tD tJC
Note: 1. tLH and tHL are measured into a capacitive load of 15pF. Note: All parameters are at an Extended Industrial temperature range unless otherwise stated.
Modulation Profile
Rev. 2 | Page 4 of 7 | www.onsemi.com
ASM3P2669A
Typical Application Schematic
VDD C1 0.1F
C2 2.2F VDD
ASM3P2669A Rs ModOUT ModOUT Clock
VSS
Rev. 2 | Page 5 of 7 | www.onsemi.com
ASM3P2669A
Package Information 6L-TSOP Package
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
Rev. 2 | Page 6 of 7 | www.onsemi.com
ASM3P2669A
Ordering Information Part Number
ASM3P2669AF-06OR ASM3I2669AF-06OR
Marking
H4L H5L
Package Type
6L-TSOP (6L-TSOT-23), TAPE & REEL, Pb Free 6L-TSOP (6L-TSOT-23), TAPE & REEL, Pb Free
Temperature
0 to +70 C C -40 to +85 C C
A "microdot" placed at the end of last row of marking or just below the last row toward the center of package indicates Pb-free.
Licensed under US Patent #5,488,627 and #5,631,921.
Note: This product utilizes US Patent #6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. U.S Patent Pending; Timing-Safe and Active Bead are trademarks of PulseCore Semiconductor, a wholly owned subsidiary of ON Semiconductor. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81-3-5773-3850 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative

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