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ASM3X2105AFTR Datasheet(PDF) 3 Page - Alliance Semiconductor Corporation |
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ASM3X2105AFTR Datasheet(HTML) 3 Page - Alliance Semiconductor Corporation |
3 / 10 page October 2003 ASM3X2105A rev 1.0 Low Frequency EMI Reduction 3 of 10 Notice: The information in this document is subject to change without notice. 1 2 3 4 CLKIN XOUT DIV2 VSS MODOUT 5 6 7 8 SR0 SSON# VDD ASM3X2105A Spread Spectrum Spreading the spectrum of the signal reduces the system EMI. The optimal setting should minimize system EMI to the fullest without affecting system performance. The spreading is described as a percentage deviation of the center frequency (Note: The center frequency is the frequency of the external reference input on CLKIN, Pin1). Example: The ASM3X2105A is designed for communications, digital video and imaging applications. It is not only optimized for operation in the 6MHz – 12MHz range, but its output frequency can be extended down to one half of the input clock frequency using the divide-by-two feature. This feature extends low frequency operation to as low as 3MHz. Setting pin 3 low (DIV2=0; divide-by-two mode) sets the output frequency (MODOUT) to half the frequency of the input clock (CLKIN). This is a simple way to generate a spread spectrum modulated low frequency clock when only a higher frequency signal is available. If you want the output frequency to be the same as the input, you can either set DIV2=1 or leave it unconnected. 8.832MHz Crystal Modulated 4.416MHz is connected to CLK input pin of the system +5V 0.1µF |
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