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ASM3P2180A

Alliance Semiconductor Corporation
Part Number ASM3P2180A
Manufacturer Alliance Semiconductor Corporation
Description Peak Reducing EMI Solution
Published Mar 3, 2009
Detailed Description September 2004 www.DataSheet4U.com ASM3P2180A Peak Reducing EMI Solution typical narrow band signal produced by oscilla...
Datasheet PDF File ASM3P2180A PDF File

ASM3P2180A
ASM3P2180A

Overview
September 2004 www.
DataSheet4U.
com ASM3P2180A Peak Reducing EMI Solution typical narrow band signal produced by oscillators and most clock generators.
Lowering EMI by increasing a signal’s bandwidth is called spread spectrum clock generation.
The ASM3P2180A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all-digital method.
Applications The ASM3P2180A is targeted towards notebook LCD displays, other displays using an LVDS interface, PC peripheral devices and embedded systems.
Key Specifications Description Supply voltages Frequency range FS1=0 FS1=1 Specification VDD = 3.
3V ± 5% 6 MHz ≤ Fin ≤10 MHz 18 MHz ≤ Fin ≤ 30 MHz 325 pS (max) -1.
25% or –2.
4% 45/55% (worst case) 5ns (maximum) rev 1.
0 Features • Generates an EMI optimized clocking signal at the output.
• Selectable output frequency range.
• Single 1.
25% or 2.
4% down spread output.
• Integrated loop filter components.
• Operates with a 3.
3V supply.
• Low-power CMOS design.
• Available in 8-pin SOIC and 8-pin TSSOP packages.
Product Description The ASM3P2180A is a versatile Spread Spectrum frequency modulator designed specifically for a wide range of clock frequencies.
The ASM3P2180A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals.
The ASM3P2180A allows significant system cost savings by reducing the number of circuit board layers and shielding that are traditionally required to pass EMI regulations.
The ASM3P2180A modulates the output of a single PLL in order to “spread” the bandwidth of a synthesized clock, thereby decreasing the peak amplitudes of its harmonics.
This results in significantly lower system EMI compared to the Simplified Block Diagram Cycle-to-cycle jitter Selectable spread percentage Output duty cycle Output rise and fall time 3.
3V X1 ASM3P2180A X2 Spread spectrum output (EMI suppressed) Alliance Semiconductor 2595, Au...


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