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PCS5P23Z05D Datasheet(PDF) 3 Page - PulseCore Semiconductor |
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PCS5P23Z05D Datasheet(HTML) 3 Page - PulseCore Semiconductor |
3 / 14 page PCS5P23Z05D May 2007 PCS5P23Z09D rev 0.2 Multiple Output Timing-Safe™ Peak EMI Reduction IC 3 of 14 Notice: The information in this document is subject to change without notice. REF CLK2 CLK1 CLK3 1 2 3 5 6 7 8 PCS5P23Z05D GND VDD CLKOUT CLK4 4 Spread Spectrum Frequency Generation The clocks in digital systems are typically square waves with a 50% duty cycle and as frequencies increase the edge rates also get faster. Analysis shows that a square wave is composed of fundamental frequency and harmonics. The fundamental frequency and harmonics generate the energy peaks that become the source of EMI. Regulatory agencies test electronic equipment by measuring the amount of peak energy radiated from the equipment. In fact, the peak level allowed decreases as the frequency increases. The standard methods of reducing EMI are to use shielding, filtering, multi-layer PCBs etc. These methods are expensive. Spread spectrum clocking reduces the peak energy by reducing the Q factor of the clock. This is done by slowly modulating the clock frequency. The PCS5P23Z05D/09D uses the center modulation spread spectrum technique in which the modulated output frequency varies above and below the reference frequency with a specified modulation rate. With center modulation, the average frequency is same as the unmodulated frequency and there is no performance degradation Timing-Safe™ technology Timing-Safe™ technology is the ability to modulate a clock source with Spread Spectrum technology and maintain synchronization with any associated data path. Pin Configuration S2 2 1 3 4 5 6 7 8 CLKA2 VDD GND CLKB1 CLKB2 CLKA1 REF 11 9 10 12 13 14 15 16 CLKA3 CLKA4 CLKB3 CLKB4 VDD CLKOUT GND PCS5P23Z09D S1 |
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