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ASM3P2111B Datasheet(PDF) 1 Page - Alliance Semiconductor Corporation |
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ASM3P2111B Datasheet(HTML) 1 Page - Alliance Semiconductor Corporation |
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1 / 8 page  Alliance Semiconductor 2575 Augustine Drive • Santa Clara CA • Tel: 408-855-4900 • Fax: 408-855-4999 • www.alsc.com rev 0.1 May 2005 ASM3P2111B Peak EMI Reducing Solution Features Generates an EMI optimized clock at the output. Input frequency: 25 MHz. Frequency outputs: o 60 MHz (unmodulated) o 2 x 48 MHz (unmodulated) o 66.6 MHz (modulated): -1.7% down spread Modulation rate: 30 KHz. Supply voltage range: 3.3V ± 0.3V. Available in 8-pin SOIC Package. Commercial and Industrial Temperature range. RoHS Compliant Product Description The ASM3P2111B is a versatile spread spectrum frequency modulator that reduces electromagnetic interference (EMI) at the clock source. The ASM3P2111B 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. Applications ASM3P2111B is targeted towards EMI management for high speed digital applications such as PC peripheral devices, consumer electronics and embedded controller systems. Block Diagram VDD Crystal Oscillator 66.6 MHz Modulated XIN /CLKIN XOUT VSS 48 MHz_2 60 MHz 48 MHz_1 PLL1 PLL2 48 MHz_1 |
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