P2040A Datasheet | Alliance Semiconductor

October 2005 rev 1.2 LCD Panel EMI Reduction IC Features - - - - - - - - - - - - .. P2040A applications. The P2040A reduces electromagnetic interference (EMI) at the clock source, allowing system FCC approved method of EMI attenuation. Provides up to 20dB of EMI suppression. Generates a low EMI spread spectrum clock of the input frequency. Input frequency range: 30MHz to 100MHz. Optimized for VGA, SVGA, and higher resolution XGA LCD Panels. Internal loop filter minimizes external ponents and board space. Six selectable high spread ranges up to ± 2%. Two selectable modulation rates. SSON# control pin for spread spectrum enable and disable options. Low cycle-to-cycle jitter. Wide operating range. Low power CMOS design. Supports most mobile graphic accelerator specifications. - Products available for automotive temperature range. (Refer Spread Spectrum Range Selection Tables) The P2040A uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all digital method. The P2040A modulates the output of a single PLL in order to “spread” the bandwidth of a synthesized clock, and more importantly, decreases 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 frequency generators. Lowering EMI by increasing a signal’s bandwidth is called ‘spread spectrum clock generation’. wide reduction of EMI of down stream clock and data dependent signals. The P2040A allows significant system cost savings by reducing the number of circuit board layers ferrite beads, regulations. shielding and other passive ponents that are traditionally required to pass EMI - Applications The P2040A is targeted...