ASM3P2111B

May 2005 www.DataSheet4U.com ASM3P2111B Peak EMI Reducing Solution rev 0.1 Features ƒ ƒ ƒ Generates an EMI optimized clock at the output. Input frequency: 25 MHz. Frequency outputs: o o o ƒ ƒ ƒ ƒ ƒ 60 MHz (unmodulated) 2 x 48 MHz (unmodulated) 66.6 MHz (modulated): -1.7% down spread allows significant system cost savings by reducing the number of circuit board layers and shielding that are required to pass EMI regulations. The ASM3P2111B modulates the output of PLL in order to spread the bandwidth of a synthesized clock, thereby decreasing 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 clock generators. Lowering EMI by increasing a signal’s bandwidth is called spread spectrum clock generation. Modulation rate: 30 KHz. Supply voltage range: 3.3V ± 0.3V. Available in 8-pin SOIC Package. Commercial and Industrial Temperature range. RoHS Compliant Applications ASM3P2111B is targeted towards EMI management for Product Description The ASM3P2111B is a versatile spread spectrum frequency modulator that reduces electromagnetic interference (EMI) at the clock source. The ASM3P2111B high speed digital applications such as PC peripheral devices, consumer electronics and embedded controller systems. Block Diagram VDD XIN /CLKIN XOUT 60 MHz Crystal Oscillator PLL1 48 MHz_1 48 MHz_2 48 MHz_1 PLL2 66.6 MHz Modulated VSS Alliance Semiconductor 2575 Augustine Drive ...