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ASM3P2869A

Alliance Semiconductor Corporation
Part Number ASM3P2869A
Manufacturer Alliance Semiconductor Corporation
Description Low Power Peak EMI Reducing Solution
Published Mar 3, 2009
Detailed Description October 2005 www.DataSheet4U.com rev 1.6 ASM3P2869A Low Power Peak EMI Reducing Solution Features ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ Ge...
Datasheet PDF File ASM3P2869A PDF File

ASM3P2869A
ASM3P2869A

Overview
October 2005 www.
DataSheet4U.
com rev 1.
6 ASM3P2869A Low Power Peak EMI Reducing Solution Features ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ 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 range: 6MHz to 12MHz for 2.
5V : 6MHz to 13MHz for 3.
3V Generates a 1X low EMI spread spectrum clock of the input frequency Frequency deviation: ±1%(Typ) @ 10MHz Available in 6-pin TSOT-23, 8-pin SOIC and 8-pin TSSOP packages The ASM3P2869A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method.
The ASM3P2869A 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 ASM3P2869A is targeted towards all portable devices with very low power requirements like MP3 players, Notebooks and digital still cameras.
Product Description The ASM3P2869A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies.
The ASM3P2869A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of all clock dependent signals.
The ASM3P2869A 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 200pS ( Max) 45/55% FIN/256 ±1% (Typ) @ 10MHz Block Diagram VDD XIN XOUT Crystal Os...


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