ASM3P2863AF-06OR ON Semiconductor

ASM3P2863A Peak EMI Reducing Solution Features The ASM3P2863A uses the most efficient and optimized modulation profile approved by the FCC and is Generates an EMI optimized clock signal at the implemented by using a proprietary all digital method. output. Integrated loop filter components. The ASM3P2863A modulates the output of a single PLL Operates with a 3.3V / 2.5V supply. in order to spread the bandwidth of a synthesized clock, Operating current less than 4mA. and more importantly, decreases the peak amplitudes of CMOS design. its harmonics. This result in significantly lower system EMI compared to the typical narrow band signal produced Input frequency: 12MHz by oscillators and most frequency generators. Lowering Generates a 1X low EMI spread spectrum clock of EMI by increasing a signals bandwidth is called spread the input frequency. spectrum clock generation. Frequency deviation: 0.4%(Typ) @ 12MHz Input Frequency Applications Available in 6L-TSOP (6L-TSOT-23) package. The ASM3P2863A is targeted towards all portable devices with very low power requirements like MP3 Product Description players, Notebooks and Digital still cameras. The ASM3P2863A is a versatile spread spectrum frequency modulator designed specifically for a wide Key Specifications range of clock frequencies. The ASM3P2863A reduces Description Specification electromagnetic interference (EMI) at the clock source, Supply voltages V = 2.5V / 3.3V DD allowing system wide reduction of EMI of all clock Cycle-to-Cycle Jitter 200pS ( typ) dependent signals. The ASM3P2863A allows significant system cost savings by reducing the number of circuit Output Duty Cycle 45/55% (worst case) board layers, ferrite beads and shielding that are Modulation Rate Equation F /256 IN traditionally required to pass EMI regulations. Frequency Deviation 0.4 % (Typ) @ 12MHz Block Diagram VDD PLL Modulation XIN / CLKIN Crystal Frequency XOUT Oscillator Divider Output Phase Loop VCO Detector Filter Divider Feedback Divider ModOUT REFOUT VSS 2010 SCILLC. All rights reserved. Publication Order Number: OCTOBER 2010 Rev. 1.1 ASM3P2863/D ASM3P2863A Pin Configuration (6L-TSOP Package) 1 6 REFOUT VSS ASM3P2863A XOUT 2 5 ModOUT 3 XIN / CLKIN 4 VDD Pin Description Pin# Pin Name Type Description 1 REFOUT O Buffered output of the input frequency. 2 XOUT O Crystal connection. If using an external reference, this pin must be left unconnected. Crystal connection or external reference frequency input. This pin has dual functions. 3 XIN / CLKIN I It can be connected either to an external crystal or an external reference clock. 4 VDD P Power supply for the entire chip. 5 ModOUT O Spread spectrum clock output. 6 VSS P Ground connection. Rev. 1 | Page 2 of 7 | www.onsemi.com