ASM3P2111B Datasheet | Alliance Semiconductor Corporation

Features - - - Generates an EMI optimized clock at the output. Input frequency: 25 MHz. Frequency outputs: o o o - - - - - 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 pared 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. mercial and Industrial Temperature range. Ro HS pliant 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 XIN /CLKIN XOUT 60 MHz Crystal Oscillator PLL1 48 MHz_1 48 MHz_2 48 MHz_1 PLL2 66.6 MHz Modulated Alliance Semiconductor 2575 Augustine Drive - Santa Clara CA - Tel: 408-855-4900 - Fax: 408-855-4999 - .alsc. May 2005 .. ASM3P2111B rev 0.1 Pin Configuration XIN/ CLKIN XOUT VDD 60 MHz 1 2 3 4 8 7 VSS 66.6 MHz 48 MHz_1 48 MHz_2 6 5 Pin Description Pin # 1 2 3 4 5 6 7 8 Pin Name XIN / CLKIN XOUT VDD 60 MHz 48 MHz_2 48 MHz_1 66.6 MHz VSS Type I O P O O O O P Description Connection to crystal Connection to crystal Power supply for the analog and digital blocks (+3.3V) Clock output-1 60 MHz un-modulated Clock output-2 48 MHz_2 un-modulated Clock output-3 48 MHz_1 un-modulated Clock output-4 66.6 MHz...