ASM3P2775AF-06OR ON Semiconductor

ASM3P2775A Peak EMI Reducing Solution Features The ASM3P2775A 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 ASM3P2775A modulates the output of a single PLL Operates with a 3.3V 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 range: 13MHz to 30MHz 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: 1.8% (Typ) @14.7MHz Input Frequency. Applications Available in 6L-TSOP (6L-TSOT-23) package. The ASM3P2775A is targeted towards all portable devices with very low power requirements like MP3 Product Description players and digital still cameras. The ASM3P2775A is a versatile spread spectrum frequency modulator designed specifically for a wide Key Specifications range of clock frequencies. The ASM3P2775A reduces Description Specification electromagnetic interference (EMI) at the clock source, Supply voltage VDD = 3.3V 0.3V allowing system wide reduction of EMI of all clock Cycle-to-Cycle Jitter 200pS (typ) dependent signals. The ASM3P2775A 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 /640 IN traditionally required to pass EMI regulations. Frequency Deviation 1.8% (Typ) @ 14.7MHz Block Diagram VDD PD PLL Modulation XIN/CLKIN Crystal Frequency Oscillator Divider XOUT Phase Loop Output VCO Detector Filter Divider Feedback Divider ModOUT VSS 2010 SCILLC. All rights reserved. Publication Order Number: JANUARY 2010 Rev. 1 ASM3P2775/D ASM3P2775A Pin Configuration (6L-TSOP Package) 1 6 PD VSS ASM3P2775A XOUT 2 5 ModOUT 4 3 VDD XIN / CLKIN Pin Description Pin# Pin Name Type Description Power-down control pin. Pull low to enable power-down mode. Connect to VDD if not 1 I PD used. 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. It 3 XIN / CLKIN I 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 8 | www.onsemi.com