P1817B Datasheet | Alliance Semiconductor

.. October 2003 rev 1.0 Low-Power Mobile VGA EMI Reduction IC Features FCC approved method of EMI attenuation. Generates a low EMI spread spectrum clock of the input frequency. Optimized for frequency range from: o o P1817A - 20 to 30MHz. Operation P1817B - 10 to 20MHz Operation P1817A/B down stream clock and data dependent signals. The P1817 allows significant system cost savings by reducing the number of circuit board layers ferrite beads, shielding and other passive ponents that are traditionally required to pass EMI regulations. The P1817 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’. The P1817 uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all digital method. Internal loop filter minimizes external ponents and board space. Two selectable spread ranges. Low inherent cycle-to-cycle jitter. 3.3V or 5V operating voltage range. TTL or CMOS patible outputs. Ultra-low power CMOS design. 3.17m A @3.3V, 10MHz | 6.20m A@5.0V, 10MHz 4.28m A @3.3V, 14MHz | 7.50m A @5.0V, 14MHz 5.50m A @3.3V, 20MHz | 9.50m A @5.0V, 20MHz Supports notebook VGA and other LCD timing controller applications. SSON pin for Spread Spectrum On/Off and Standby Mode controls. Available in 8-pin SOIC and TSSOP. Applications The P1817 is targeted towards notebook VGA chip and other displays using an LVDS interface, PC peripheral devices, and embedded systems. Product Description The P1817 is a versatile spread spectrum frequency modulator designed specifically for input clock frequencies. The P1817 reduces electromagnetic interference (EMI) at the clock...