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ASM3P2190A-08TT Datasheet(PDF) 1 Page - Alliance Semiconductor Corporation |
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ASM3P2190A-08TT Datasheet(HTML) 1 Page - Alliance Semiconductor Corporation |
1 / 7 page Alliance Semiconductor 2595, Augustine Drive • Santa Clara • CA 95054 • Tel 408 855 4900 • Fax 408 855 4999 • www.alsc.com November 2003 ASM3P2190A rev 1.0 Notice: The information in this document is subject to change without notice. Peak Reducing EMI Solution 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 ASM3P2190A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. The ASM3P2190A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The ASM3P2190A allows significant system cost savings by reducing the number of circuit board layers and shielding that are traditionally required to pass EMI regulations. The ASM3P2190A 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 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 ASM3P2190A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all-digital method. Applications The ASM3P2190A is targeted towards notebook LCD displays, other displays using an LVDS interface, PC peripheral devices and embedded systems. Key Specifications Description Specification Supply voltages VDD = 3.3V ± 5% Frequency range 6 MHz ≤ 30 MHz Cycle-to-cycle jitter 325 ps (typical) Selectable spread percentage -1.25% or –2.4% Output duty cycle 40/60% (worst case) Output rise and fall time 5ns (maximum) Simplified Block Diagram Pin Diagram X1 X2 3.3V Spread spectrum output (EMI suppressed) CLKOUT NC VDD FS1 1 2 3 4 5 6 7 8 CLKIN / X1 NC / X2 GND SS% ASM3P2190A |
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