器件名称: I1817A-08SR
功能描述: Low-Power Mobile VGA EMI Reduction IC
文件大小: 302.67KB 共10页
简 介: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 components 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 compared 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 components and board space. Two selectable spread ranges. Low inherent cycle-to-cycle jitter. 3.3V or 5V operating voltage range. TTL or CMOS compatible outputs. Ultra-low power CMOS design. 3.17mA @3.3V, 10MHz | 6.20mA@5.0V, 10MHz 4.28mA @3.3V, 14MHz | 7.50mA @5.0V, 14MHz 5.50mA @3.3V, 20MHz | 9.50mA @5.0V, 20MHz
Supports notebook VGA and other LCD timing ……
