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X2781AG-08ST Datasheet(PDF) 4 Page - Alliance Semiconductor Corporation |
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X2781AG-08ST Datasheet(HTML) 4 Page - Alliance Semiconductor Corporation |
4 / 11 page July 2005 P2781/82/84 rev 1.5 General Purpose EMI Reduction IC 4 of 11 Notice: The information in this document is subject to change without notice. Spread Spectrum Selection The P278xA performs Zero Cycle Slip when set at low percentage spreading. This allows no occurrence of system timing error. 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, Pin 1.) The P2781A is designed for PC peripheral, networking, notebook PC, and LCD monitor applications. It is optimized for operation between 3 to 78MHz range. In the following application schematic example, the P2781A spread percentage selection is determined by the external LF value specified in the Loop Filter Selection Table. The Input Frequency Selection Table specifies the input frequency range. The external LF allows the user to fine tune the spread percentage to optimize the EMI reduction benefits of the spread spectrum. Note: Both logic input pins FS1 and FS0 have to be connected to either VDD or VSS. Do not leave them floating. 1 2 3 4 8 7 6 5 VDD FS0 ModOUT VSS LF FS1 XOUT XIN/CLKIN P2781A +3.3V Modulated 16MHz Clock To target Chip 16 MHz 0.1µF C2 C1 R1 0 Ohm 2.2 K |
Similar Description - X2781AG-08ST |
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