ASM3P2775A Peak EMI Reducing Solution Features The ASM3P2775A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method. • Generates an EMI optimized clock signal at the output. • Integrated loop filter components. The ASM3P2775A 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 compared 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.’ • Operates with a 3.3V Supply. • Operating current less than 4mA. • CMOS design. • Input frequency range: 13MHz to 30MHz • Generates a 1X low EMI spread spectrum clock of the input frequency. • 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 players and digital still cameras. Product Description The ASM3P2775A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. The ASM3P2775A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of all clock dependent signals. The ASM3P2775A 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. Key Specifications Description Specification Supply voltage VDD = 3.3V ± 0.3V Cycle-to-Cycle Jitter ±200pS (typ) Output Duty Cycle 45/55% (worst case) Modulation Rate Equation FIN/640 Frequency Deviation ±1.8% (Typ) @ 14.7MHz Block Diagram VDD PD PLL Modulation XIN/CLKIN XOUT Crystal Oscillator Frequency Divider Feedback Divider Phase Detector Loop Filter VCO Output Divider ModOUT VSS ©2010 SCILLC. All rights reserved. JANUARY 2010 – Rev. 1 Publication Order Number: ASM3P2775/D ASM3P2775A Pin Configuration (6L-TSOP Package) PD 1 XOUT 2 ASM3P2775A XIN / CLKIN 3 6 VSS 5 ModOUT 4 VDD Pin Description Pin# 1 Pin Name PD Type Description I Power-down control pin. Pull low to enable power-down mode. Connect to VDD if not used. 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. Rev. 1 | Page 2 of 8 | www.onsemi.com ASM3P2775A Modulation Profile Specifications Description Specification Frequency Range 13MHz < CLKIN < 30MHz Modulation Equation FIN/640 Frequency Deviation ±1.8% (Typ) @ 14.7MHz Absolute Maximum Ratings Symbol Rating Unit Voltage on any pin with respect to Ground -0.5 to +4.6 V Storage temperature -65 to +125 °C TA Operating temperature -40 to +85 °C Ts Max. Soldering Temperature (10 sec) 260 °C TJ Junction Temperature 150 °C 2 KV VDD, VIN TSTG TDV Parameter Static Discharge Voltage (As per JEDEC STD22- A114-B) 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 3.0 3.6 V 0 +70 °C TA Operating Temperature (Ambient Temperature) CL Load Capacitance 15 pF CIN Input Capacitance 7 pF Rev. 1 | Page 3 of 8 | www.onsemi.com ASM3P2775A DC Electrical Characteristics Symbol VIL Parameter Min Typ Max Unit V Input low voltage VSS-0.3 0.8 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 IXOH XOUT output high current (@ 2.5V, VDD = 3.3V) 3 VOL Output low voltage (VDD = 3.3 V, IOL = 8mA) VOH Output high voltage (VDD = 3.3 V, IOH = 8mA) 2.5 IDD Static supply current ICC Dynamic supply current (3.3V, 16MHz and no load) 3.5 3.0 Power-up time (first locked cycle after power-up) ZOUT 3.3 1 Output impedance V V 10 Operating voltage tON mA 0.4 1 VDD mA uA mA 3.6 V 5 mS Ω 45 Notes: 1. XIN / CLKIN pin and PD pin are pulled low. 2. VDD and XIN / CLKIN input are stable, PD pin is made high from low. AC Electrical Characteristics 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 ±1.45% % 1 Output rise time (measured from 0.8 to 2.0V) 0.5 1.1 1.3 nS 1 Output fall time (measured at 2.0V to 0.8V) 0.3 0.8 1.0 nS ±200 ±300 pS 50 55 % tLH tHL Parameter tJC Jitter (cycle-to-cycle) tD Output duty cycle 45 Note: 1. tLH and tHL are measured into a capacitive load of 15pF. Rev. 1 | Page 4 of 8 | www.onsemi.com ASM3P2775A Typical Crystal Specifications Fundamental AT cut parallel resonant crystal Nominal frequency 14.31818MHz Frequency tolerance ±50ppm or better at 25°C Operating temperature range -25°C to +85°C Storage temperature -40°C to +85°C Load capacitance 18pF Shunt capacitance 7pF maximum ESR 25 Ω 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 XIN Rx XOUT CL CL CL = 2*(CP – CS), Where CP = Load capacitance of crystal from crystal vendor datasheet. CS = Stray capacitance due to CIN, PCB, Trace, etc. Rev. 1 | Page 5 of 8 | www.onsemi.com ASM3P2775A Typical Application Schematic VDD C1 0.1µF C2 2.2µF VDD XIN / CLKIN CL Rs ModOUT Y1 ModOUT Clock XOUT CL ASM3P2775A VDD PD VSS Note: Refer to Pin Description table for Functionality details. Rev. 1 | Page 6 of 8 | www.onsemi.com ASM3P2775A Package Information 6L-TSOP Package Dimensions Symbol Inches Min Max Millimeters Min Max A ….. 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. 1 | Page 7 of 8 | www.onsemi.com ASM3P2775A Ordering Information Part Number ASM3P2775AF-06OR Marking Package Type Temperature X4L 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. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. 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