P2784 Datasheet | onsemi

Features - Provides up to 15d B of EMI suppression - FCC approved method of EMI attenuation - Generates a 1X, 2X, and 4X low EMI spread spectrum clock of the input frequency - Input frequency range from 3 to 78MHz - External loop filter for spread % adjustment - Spreading ranges from ±0.25% to ±5.0% - Ultra low cycle-to-cycle jitter - Zero-cycle slip - 3.3V operating voltage range - Ultra-low power CMOS design - P278x A is available in an 8 pin SOIC Package source, which provides system wide reduction of EMI of all clock dependent signals. The P278x A allows significant system cost savings by reducing the number of circuit board layers and shielding that are traditionally required to pass EMI regulations. The P278x A uses the most efficient and optimized modulation profile approved by the FCC. The P278x A 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 result in significantly lower system EMI pared 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. Product Description The P278x A is a versatile spread spectrum frequency modulator designed specifically for digital camera and other digital video and imaging applications. The P278x A reduces electromagnetic interference (EMI) at the clock Applications The P278x A is targeted towards MFP, x DSL, fax modem, set-top box, USB controller, DSC, and embedded systems. Block Diagram FS0 FS1 LF VDD PLL Modulation XIN / CLKIN XOUT Crystal Oscillator Frequency Divider Feedback Divider Phase Detector VCO Output Divider Mod OUT .. ©2010 SCILLC. All rights reserved. JANUARY 2010 - Rev. 2 Publication Order Number: P2781/82/84 P2781/82/84 Pin Configuration XIN / CLKIN XOUT FS1 LF 1 2 8 VDD 7 FS0 P278x A 3 4 6 Mod OUT 5 Standard pin Configuration offered in both 8 pin SOIC...