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ASM3P2108A Peak EMI Reducing Solution
Features
* FCC approved method of EMI attenuation. * Generates a 1X low EMI spread spectrum clock of the input frequency. * Input frequency range: 25MHz to 45MHz. * Internal loop filter minimizes external components and board space. * Frequency deviation: - 1.3%( Typ) @ 32MHz. * Low cycle-to-cycle jitter. * 5.0V 5% operating voltage range. * TTL or CMOS compatible outputs. by reducing the number of circuit board layers ferrite beads, shielding and other passive components that are traditionally required to pass EMI regulations. The ASM3P2108A uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all digital method. The ASM3P2108A 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.'
* Available in 8-pin SOIC Package. Product Description
The ASM3P2108A is a versatile spread spectrum frequency modulator designed specifically for input clock frequencies from 25MHz to 45MHz. The ASM3P2108A can generate an EMI reduced clock from crystal, ceramic resonator, or system clock. The ASM3P2108A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The ASM3P2108A allows significant system cost savings
Applications
The ASM3P2108A is targeted towards EMI management for high speed digital applications such as PC peripheral devices, consumer electronics and embedded controller systems.
Block Diagram
VDD
Modulation XIN Crystal Oscillator XOUT Feedback Divider Frequency Divider
PLL
Phase Detector
Loop Filter
VCO
Output Divider CLOCKOUT
GND
(c)2010 SCILLC. All rights reserved. JANUARY 2010 - Rev. 1
Publication Order Number: ASM3P2108/D
ASM3P2108A
Pin Configuration
XIN / CLKIN 1 XOUT 2 GND 3 NC 4
8 NC ASM3P2108A 7 NC 6 VDD 5 CLOCKOUT
Pin Description Pin#
1 2 3 4 5 6 7 8
Pin Name
XIN / CLKIN XOUT GND NC CLOCKOUT VDD NC NC
Type
I O P O P -
Description
Crystal connection or external reference frequency input. This pin has dual functions. It can be connected to either an external crystal or an external reference clock. Crystal connection. If using an external reference, this pin must be left unconnected. Ground to entire chip. No connect. Spread spectrum low EMI output. Power supply for the entire chip (5V). No connect. No connect.
Absolute Maximum Ratings Symbol
VDD, VIN TSTG TA Ts TJ TDV Storage temperature Operating temperature
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
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
Symbol
VDD TA CL CIN Operating temperature Load Capacitance Input Capacitance
Parameter
Supply Voltage with respect to VSS
Min
4.75 -40
Max
5.25 +85 15 7
Unit
V C pF pF
Rev. 1 | Page 2 of 5 | www.onsemi.com
ASM3P2108A
DC Electrical Characteristics Symbol Parameter
VIL VIH IIL IIH IXOL IXOH VOL VOH ICC IDD VDD tON ZOUT Input low voltage Input high voltage Input low current Input high current XOUT output low current (@ 0.4, VDD = 5V) XOUT output high current (@2.5V, VDD = 5V) Output low voltage (VDD = 5V, IOL = 20mA) Output high voltage (VDD = 5V, IOH = 20mA) Dynamic supply current normal mode (5V, 32MHz and 15pF loading) Static supply current standby mode Operating voltage Power up time (first locked clock cycle after power up) Clock out impedance 2.5 40 40 4.75 5.0 0.18 50 5.25
Min
GND - 0.3 2.0
Typ
Max
0.8 VDD + 0.3
Unit
V V A A mA mA
44 66 3 3 0.4
V V mA A V mS
AC Electrical Characteristics Symbol
fIN MODOUT fd tLH* tHL* tJC tD Input frequency Output frequency
Parameter
Min
25 25
Typ
Max
45 45
Unit
MHz MHz % pS pS
Input Frequency = 25MHz Frequency Deviation Input Frequency = 45MHz Output rise time (measured at 0.8V to 2.0V) Output fall time (measured at 2.0V to 0.8V) Jitter (cycle to cycle) Output duty cycle 45
-1.98 -0.60 440 300 360 50 55
pS %
* VDD = +5V, Input Frequency = 32MHz, tLH and tHL are measured into a capacitive load of 15pF
Rev. 1 | Page 3 of 5 | www.onsemi.com
ASM3P2108A
Package Information
8-Pin SOIC Package
E
H
D
A2
A
e A 1 B
C L
D
Dimensions Inches Min
A1 A A2 B C D E e H L 0.004 0.053 0.049 0.012 0.007
Symbol
Millimeters Max 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
0.010 0.069 0.059 0.020 0.010
0.193 BSC 0.154 BSC 0.050 BSC 0.236 BSC 0.016 0 0.050 8
Rev. 1 | Page 4 of 5 | www.onsemi.com
ASM3P2108A
Ordering Codes Part Number
ASM3P2108AF-08SR
Marking
AEG
Package
8-PIN SOIC, TAPE AND REEL, Pb Free
Temperature
0 to +70 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, #6,646,463 and #5,631,920.
Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003. are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes ON Semiconductor and 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.
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