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P1817B

Alliance Semiconductor
Part Number P1817B
Manufacturer Alliance Semiconductor
Description Low-Power Mobile VGA EMI Reduction IC
Published Nov 15, 2007
Detailed Description www.DataSheet4U.com October 2003 rev 1.0 Low-Power Mobile VGA EMI Reduction IC Features FCC approved method of EMI atte...
Datasheet PDF File P1817B PDF File

P1817B
P1817B

Overview
www.
DataSheet4U.
com 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...


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