ASM3P2872A Peak EMI Reducing Solution Features The ASM3P2872A uses the most efficient and optimized • Generates an EMI optimized clock signal at the modulation profile approved by the FCC and is output. implemented by using a proprietary all digital method. • Integrated loop filter components. The ASM3P2872A 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 6mA. and more importantly, decreases the peak amplitudes of • CMOS design. its harmonics. This results in significantly lower system • Input frequency range: 13MHz to 30MHz for 2.5V EMI compared to the typical narrow band signal produced 13MHz to 30MHz for 3.3V by oscillators and most frequency generators. Lowering • Generates a 1X low EMI spread spectrum clock of EMI by increasing a signal’s bandwidth is called ‘spread the input frequency. spectrum clock generation.’ • Frequency deviation: -1.25% @ 22MHz. • Available in 6L-TSOP (6L-TSOT-23) packages. Applications The ASM3P2872A is targeted towards all portable Product Description The ASM3P2872A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. The ASM3P2872A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of all clock dependent signals. The ASM3P2872A allows significant system cost savings by reducing the number of circuit board layers, ferrite beads and shielding that are traditionally required to pass EMI regulations. Block Diagram devices like MP3 players, Notebooks and digital still cameras. Key Specifications Description Specification Supply voltages VDD = 3.3V /2.5V Cycle-to-Cycle Jitter ±200pS (Typ) Output Duty Cycle 45/55% (worst case) Modulation Rate Equation FIN/640 Frequency Deviation -1.25% @ 22MHz VDD PLL Modulation XIN XOUT Crystal Oscillator Frequency Divider Feedback Divider REFOUT Phase Detector Loop Filter VCO Output Divider ModOUT VSS ©2010 SCILLC. All rights reserved. OCTOBER 2010 – Rev. 2.1 Publication Order Number: ASM3P2872/D ASM3P2872A Pin Configuration (6L-TSOP Package) REFOUT 1 XOUT 2 ASM3P2872A XIN/CLKIN 3 6 VSS 5 ModOUT 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. 3 XIN / CLKIN I Crystal connection or external reference frequency input. This pin has dual functions. 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. Modulation Profile Specifications Description Frequency Range Specification For 2.5V Supply For 3.3V Supply 13MHz < CLKIN < 30MHz 13MHz < CLKIN < 30MHz Modulation Equation FIN/640 Frequency Deviation -1.25% @ 22MHz Rev. 2 | Page 2 of 8 | www.onsemi.com ASM3P2872A Absolute Maximum Ratings Symbol VDD, VIN TSTG Parameter Rating Unit Voltage on any pin with respect to Ground -0.5 to +4.6 V Storage temperature -65 to +125 °C Ts Max. Soldering Temperature (10 sec) 260 °C TJ Junction Temperature 150 °C TDV Static Discharge Voltage (As per JEDEC STD22- A114-B) 2 KV Note: These are stress ratings only and are not implied for functional use. Exposure to absolute maximum ratings for prolonged periods of time may affect device reliability. Operating Conditions Parameter VDD Description Supply Voltage Min Max Unit 2.375 3.6 V 0 70 °C TA Operating Temperature (Ambient Temperature) CL Load Capacitance 15 pF CIN Input Capacitance 7 pF DC Electrical Characteristics for 2.5V Supply Symbol Parameter Min Typ Max Unit VIL Input low voltage VSS-0.3 0.8 V VIH Input high voltage 2.0 VDD+0.3 V IIL Input low current -35 µA IIH Input high current 35 µA IXOL XOUT output low current (@ 0.5V, VDD = 2.5V) 3 mA IXOH XOUT output high current (@ 1.8V, VDD = 2.5V) 3 mA VOL Output low voltage (VDD = 2.5 V, IOL = 8mA) VOH Output high voltage (VDD = 2.5 V, IOH = 8mA) IDD Static supply current ICC Dynamic supply current (2.5V, 30MHz and with no load) VDD tON ZOUT 0.6 1.8 1 Operating voltage 2.375 V 1.1 mA 4.0 mA 2.5 Power-up time (first locked cycle after power-up) Output impedance 50 Note: 1. XIN / CLKIN pin is pulled low. Rev. 2 | Page 3 of 8 | www.onsemi.com V 2.625 V 5 mS Ω ASM3P2872A AC Electrical Characteristics for 2.5V Supply Symbol CLKIN ModOUT fd Min Typ Max Unit Input frequency 13 30 MHz Output frequency 13 30 MHz Frequency Deviation Input Frequency = 13MHz -1.85 Input Frequency = 30MHz -0.9 % 1 Output rise time (measured from 0.7V to 1.7V) 0.7 1.5 1.7 nS 1 Output fall time (measured from 1.7V to 0.7V) 0.5 0.9 1.1 nS tLH tHL Parameter tJC Jitter (cycle-to-cycle) tD Output duty cycle ±200 45 50 Min Typ pS 55 % Note: 1. tLH and tHL are measured into a capacitive load of 15pF. DC Electrical Characteristics for 3.3V Supply Symbol Parameter Max Unit VIL Input low voltage VSS-0.3 0.8 V VIH Input high voltage 2.0 VDD+0.3 V IIL Input low current -35 µA IIH Input high current 35 µA IXOL XOUT output low current (@ 0.4V, VDD = 3.3V) 3 mA IXOH XOUT output high current (@ 2.5V, VDD = 3.3V) 3 mA VOL Output low voltage (VDD = 3.3 V, IOL = 8mA) VOH Output high voltage (VDD = 3.3 V, IOH = 8mA) 0.4 2.5 1 V V IDD Static supply current 1.2 mA ICC Dynamic supply current (3.3V, 30MHz and with no load) 5.5 mA VDD tON ZOUT Operating voltage 2.7 3.3 Power-up time (first locked cycle after power-up) Output impedance 45 Note: 1. XIN / CLKIN pin is pulled low. Rev. 2 | Page 4 of 8 | www.onsemi.com 3.6 V 5 mS Ω ASM3P2872A AC Electrical Characteristics for 3.3V Supply Symbol CLKIN ModOUT fd Min Typ Max Unit Input frequency 13 30 MHz Output frequency 13 30 MHz Frequency Deviation Input Frequency = 13MHz -1.85 Input Frequency = 30MHz -0.9 % 1 Output rise time (measured from 0.8 to 2.0V) 0.5 1.4 1.7 nS 1 Output fall time (measured at 2.0V to 0.8V) 0.4 0.9 1.1 nS tLH tHL Parameter tJC Jitter (cycle-to-cycle) tD Output duty cycle ±200 45 50 pS 55 Note: 1. tLH and tHL are measured into a capacitive load of 15pF. Typical Crystal Specifications Fundamental AT cut parallel resonant crystal Nominal frequency 14.31818MHz Frequency tolerance ± 50 ppm or better at 25°C Operating temperature range -25°C to +85°C Storage temperature -40°C to +85°C Load capacitance(CP) 18pF Shunt capacitance 7pF maximum ESR 25 Ω Note: Note: CL is Load Capacitance and Rx is used to prevent oscillations at overtone frequency of the Fundamental frequency. Typical Crystal Interface Circuit R Crystal CL Rx CL CL = 2*(CP – CS), Where CP = Load capacitance of crystal CS = Stray capacitance due to CIN, PCB, Trace etc. Rev. 2 | Page 5 of 8 | www.onsemi.com % ASM3P2872A Typical Application Schematic VDD C1 0.1µF C2 2.2µF VDD ASM3P2872A Rs ModOUT VSS Rev. 2 | Page 6 of 8 | www.onsemi.com ModOUT Clock ASM3P2872A Package Information 6L-TSOP Package Dimensions Symbol Inches Min A Max Millimeters Min Max 0.04 1.00 A1 0.00 0.004 0.00 0.10 A2 0.033 0.036 0.84 0.90 b 0.012 0.02 0.30 0.50 H 0.005 BSC 0.127 BSC D 0.114 BSC 2.90 BSC B 0.06 BSC 1.60 BSC e 0.0374 BSC 0.950 BSC C 0.11 BSC 2.80 BSC L 0.0118 0.02 0.30 0.50 θ 0° 4° 0° 4° Rev. 2 | Page 7 of 8 | www.onsemi.com ASM3P2872A Ordering Information Part Number ASM3P2872AF-06OR Marking B4L Package Type Temperature 6L-TSOP (6L-TSOT-23), TAPE & REEL, Pb Free 0°C to +70°C A “microdot” placed at the end of last row of marking or just below the last row toward the center of package indicates Pb-free. are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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