ASM3P2474A

October 2005 www.DataSheet4U.com rev 1.0 ASM3P2474A 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 Supply. Operating current less than 6mA. Low power CMOS design. Input frequency range : 13MHz to 30MHz Generates a 1X and 2X low EMI spread spectrum clock of the input frequency. Output Frequency Selection through FSEL pin Frequency deviation : -1.5% (Typ) @25MHz : -1.5% (Typ) @50MHz Available in 6-pin TSOT-23, 8-pin SOIC and 8-pin TSSOP packages. The ASM3P2474A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method. The ASM3P2474A 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’. ƒ Applications The ASM3P2474A is targeted towards all portable devices with very low power requirements like MP3 players and digital still cameras. Product Description The ASM3P2474A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. The ASM3P2474A reduces electromagnetic interfere...