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P1822

Alliance Semiconductor
Part Number P1822
Manufacturer Alliance Semiconductor
Description (P1818 - P1822) Low Power Mobile VGA EMI Reduction IC
Published Nov 15, 2007
Detailed Description www.DataSheet4U.com Production March 2003 ® P1818/19/20/21/22 Low Power Mobile VGA EMI Reduction IC Features • • • ...
Datasheet PDF File P1822 PDF File

P1822
P1822

Overview
www.
DataSheet4U.
com Production March 2003 ® P1818/19/20/21/22 Low Power Mobile VGA EMI Reduction IC Features • • • • FCC approved method of EMI attenuation Provides up to 15 dB EMI reduction Generates a low EMI spread spectrum clock and a non-spread reference clock of the input frequency Optimized for frequency range from 10 MHz to 160 MHz P1818: 10 to 20 MHz P1819: 20 to 40 MHz P1820: 40 to 80 MHz P1821: 10 to 40 MHz P1822: 80 to 160 MHz Internal loop filter minimizes external components and board space • • • • • • • • • • Selectable spread options: Down Spread and Center Spread Low inherent cycle-to-cycle jitter Eight spread % selections: +/-0.
625% to –3.
5% 3.
3V operating voltage CMOS/TTL compatible inputs and outputs Low power CMOS design Supports notebook VGA and other LCD timing controller applications Power down function for mobile application Products are available for industrial temperature range.
Available in 8-pin SOIC and TSSOP • Product Description The P18xx is a versatile spread spectrum frequency modulator designed specifically for a wide range of input clock frequencies from 10 to 160 MHz (see Input Frequency and Modulation Rate Selections).
The P18xx can generate an EMI reduced clock from crystal, ceramic resonator, or system clock.
The P18xx-A to P18xx-H offer various combinations of spread options and percentage deviations (see Spread Deviation Selections).
These combinations include Down Spread, Center Spread and percentage deviation range from ±0.
625% to -3.
50%.
The P18xx reduces electromagnetic interference (EMI) at the clock source, allowing a system wide EMI reduction for all the down stream clocks and data dependent signals.
The P18xx 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 P18xx modulates the output of a single PLL in order to “spread” the bandwidth of a synthesized clock, t...


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