ASM3P2780A Peak EMI Reducing Solution The ASM3P2780A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method. Features • Generates an EMI optimized clock signal at the output. • Integrated loop filter components. The ASM3P2780A 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 results 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 3.3 / 2.5V Supply. • Operating current less than 5mA. • CMOS design. • Input frequency range: 30MHz to 50MHz for 2.5V 30MHz to 50MHz for 3.3V • Generates a 1X low EMI spread spectrum clock of the input frequency. • Frequency deviation: ±0.75% (Typ) @ 46MHz Input Applications Frequency. The ASM3P2780A is targeted towards all portable devices like MP3 players and digital still cameras. • Available in 6L-TSOP (6L-TSOT-23) Package. Product Description Key Specifications Description The ASM3P2780A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. The ASM3P2780A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of all clock dependent signals. The ASM3P2780A 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. Specification Supply voltages VDD = 3.3V / 2.5V Cycle-to-Cycle Jitter ±200pS (Typ) Output Duty Cycle 45/55% Modulation Rate Equation FIN/1280 Frequency Deviation ±0.75 (Typ) @ 46MHz 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. OCTOBER 2010 – Rev. 2 Publication Order Number: ASM3P2780/D ASM3P2780A Pin Configuration (6L-TSOP Package) PD 1 XOUT 2 6 VSS ASM3P2780A XIN / CLKIN 3 5 ModOUT 4 VDD Pin Description Pin# Pin Name 1 Type PD 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. Specifications Description Frequency Range Specification For 2.5V Supply 30MHz < CLKIN < 50MHz For 3.3V Supply Modulation Equation FIN/1280 Frequency Deviation ±0.75% (Typ) @ 46MHz Absolute Maximum Ratings Parameter Rating Unit Voltage on any pin with respect to Ground -0.5 to +4.6 V Storage temperature -65 to +125 °C Symbol VDD, VIN TSTG Ts Max. Soldering Temperature (10 sec) 260 °C TJ Junction Temperature 150 °C 2 KV TDV 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 2.375 3.6 V -40 +85 °C TA Operating Temperature (Ambient Temperature) CL Load Capacitance 15 pF CIN Input Capacitance 7 pF Rev. 2 | Page 2 of 7 | www.onsemi.com ASM3P2780A DC Electrical Characteristics for 2.5V Supply Parameter Symbol VIL 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 (@ 0.6V, 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) 0.6 IDD Static supply current ICC Dynamic supply current (2.5V, 46MHz and no load) VDD Operating Voltage 1.8 1 10 4.0 2.375 2.5 2 tON Power-up time (first locked cycle after power-up) ZOUT V V Output impedance uA mA 2.625 V 5 mS 50 Ω Note: 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 for 2.5V Supply Parameter Symbol CLKIN ModOUT fd Typ Max Unit Input frequency 30 50 MHz Output frequency 30 50 MHz Frequency Deviation Input Frequency = 30MHz ±1.10 Input Frequency = 50MHz ±0.65 % 1 Output rise time (measured from 0.7V to 1.7V) 0.7 1.3 1.6 nS 1 Output fall time (measured from 1.7V to 0.7V) 0.4 0.8 1.0 nS tLH tHL Min tJC Jitter (cycle-to-cycle) tD Output duty cycle ±200 45 Note: 1. tLH and tHL are measured into a capacitive load of 15pF. Rev. 2 | Page 3 of 7 | www.onsemi.com 50 pS 55 % ASM3P2780A DC Electrical Characteristics for 3.3V Supply Parameter Symbol VIL 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 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 IDD Static supply current ICC Dynamic supply current (3.3V, 46MHz and no load) VDD Operating Voltage V 1 10 tON uA 5.0 2.7 mA 3.3 2 Power-up time (first locked cycle after power-up) ZOUT V 2.5 Output impedance 3.6 V 5 mS 45 Ω 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 for 3.3V Supply Symbol CLKIN ModOUT fd Min Typ Max Unit Input frequency 30 50 MHz Output frequency 30 50 MHz Frequency Deviation Input Frequency = 30MHz ±1.10 Input Frequency = 50MHz ±0.65 % 1 Output rise time (measured from 0.8 to 2.0V) 0.5 1.1 1.4 nS 1 Output fall time (measured at 2.0V to 0.8V) 0.3 0.8 1.1 nS tLH tHL Parameter tJC Jitter (cycle-to-cycle) tD Output duty cycle ±200 45 Note: 1. tLH and tHL are measured into a capacitive load of 15pF. Modulation Profile Rev. 2 | Page 4 of 7 | www.onsemi.com 50 pS 55 % ASM3P2780A Typical Crystal Specifications Fundamental AT cut parallel resonant crystal Nominal frequency 33MHz 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 Rx Crystal CL CL CL = 2*(CP – CS), Where CP = Load capacitance of crystal CS = Stray capacitance due to CIN, PCB, Trace etc. Typical Application Schematic VDD C1 0.1µF C2 2.2µF VDD ASM3P2780A ModOUT VSS Rev. 2 | Page 5 of 7 | www.onsemi.com Rs ModOUT Clock ASM3P2780A Package Information 6L-TSOP Package Dimensions Symbol Millimeters Inches Min Max A 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 6 of 7 | www.onsemi.com ASM3P2780A Ordering Information Part Number ASM3P2780AF-06OR Marking Package Type Temperature G4L 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). SCILLC reserves the right to make changes ON Semiconductor and without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. 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