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| ASM3P2780A Peak EMI Reducing Solution Features * Generates an EMI optimized clock signal at the output. * Integrated loop filter components. * 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 Frequency. * Available in 6L-TSOP (6L-TSOT-23) Package. The ASM3P2780A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method. 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.' Applications The ASM3P2780A is targeted towards all portable devices like MP3 players and digital still cameras. Product 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. Key Specifications Description Supply voltages Cycle-to-Cycle Jitter Output Duty Cycle Modulation Rate Equation Frequency Deviation Specification VDD = 3.3V / 2.5V 200pS (Typ) 45/55% FIN/1280 0.75 (Typ) @ 46MHz Block Diagram VDD PD Modulation XIN / CLKIN XOUT Crystal Oscillator Frequency Divider Feedback Divider PLL Phase Detector Loop Filter VCO Output Divider ModOUT VSS (c)2010 SCILLC. All rights reserved. JANUARY 2010 - Rev. 2 Publication Order Number: ASM3P2780/D ASM3P2780A Pin Configuration (6L-TSOP Package) PD 1 XOUT 2 XIN / CLKIN 3 ASM3P2780A 6 VSS 5 ModOUT 4 VDD Pin Description Pin# 1 2 3 4 5 6 Pin Name PD XOUT XIN / CLKIN VDD ModOUT VSS Type I O I P O P Description Power-down control pin. Pull low to enable power-down mode. Connect to VDD if not used. 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 can be connected either to an external crystal or an external reference clock. Power supply for the entire chip. Spread spectrum clock output. Ground connection. Specifications Description For 2.5V Supply Frequency Range Modulation Equation Frequency Deviation For 3.3V Supply 30MHz < CLKIN < 50MHz FIN/1280 0.75% (Typ) @ 46MHz Specification Absolute Maximum Ratings Symbol VDD, VIN TSTG Ts TJ TDV Storage temperature Max. Soldering Temperature (10 sec) Junction Temperature 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. Parameter Voltage on any pin with respect to Ground Rating -0.5 to +4.6 -65 to +125 260 150 2 Unit V C C C KV Operating Conditions Parameter VDD TA CL CIN Supply Voltage Operating Temperature (Ambient Temperature) Load Capacitance Input Capacitance Description Min 2.375 -40 Max 3.6 +85 15 7 Unit V C pF pF Rev. 2 | Page 2 of 7 | www.onsemi.com ASM3P2780A DC Electrical Characteristics for 2.5V Supply Symbol VIL VIH IIL IIH IXOL IXOH VOL VOH IDD ICC VDD tON ZOUT Input low voltage Input high voltage Input low current Input high current XOUT output low current (@ 0.6V, VDD = 2.5V) XOUT output high current (@ 1.8V, VDD = 2.5V) Output low voltage (VDD = 2.5 V, IOL = 8mA) Output high voltage (VDD = 2.5 V, IOH = 8mA) Static supply current Operating Voltage Power-up time (first locked cycle after power-up) Output impedance 2 1 Parameter Min VSS-0.3 2.0 Typ Max 0.8 VDD+0.3 -35 35 Unit V V A A mA mA 3 3 0.6 1.8 10 4.0 2.375 2.5 50 2.625 5 V V uA mA V mS Dynamic supply current (2.5V, 46MHz and no load) 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 Symbol CLKIN ModOUT fd tLH tHL 1 1 Parameter Input frequency Output frequency Frequency Deviation Input Frequency = 30MHz Input Frequency = 50MHz Min 30 30 Typ Max 50 50 Unit MHz MHz % 1.10 0.65 0.7 0.4 45 1.3 0.8 200 50 55 1.6 1.0 Output rise time (measured from 0.7V to 1.7V) Output fall time (measured from 1.7V to 0.7V) Jitter (cycle-to-cycle) Output duty cycle nS nS pS % tJC tD Note: 1. tLH and tHL are measured into a capacitive load of 15pF. Rev. 2 | Page 3 of 7 | www.onsemi.com ASM3P2780A DC Electrical Characteristics for 3.3V Supply Symbol VIL VIH IIL IIH IXOL IXOH VOL VOH IDD ICC VDD tON ZOUT Input low voltage Input high voltage Input low current Input high current XOUT output low current (@ 0.4V, VDD = 3.3V) XOUT output high current (@ 2.5V, VDD = 3.3V) Output low voltage (VDD = 3.3 V, IOL = 8mA) Output high voltage (VDD = 3.3 V, IOH = 8mA) Static supply current Operating Voltage Power-up time (first locked cycle after power-up) Output impedance 2 1 Parameter Min VSS-0.3 2.0 Typ Max 0.8 VDD+0.3 -35 35 Unit V V A A mA mA 3 3 0.4 2.5 10 5.0 2.7 3.3 45 3.6 5 V V uA mA V mS Dynamic supply current (3.3V, 46MHz and no load) 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 tLH tHL 1 1 Parameter Input frequency Output frequency Frequency Deviation Input Frequency = 30MHz Input Frequency = 50MHz Min 30 30 Typ Max 50 50 Unit MHz MHz % 1.10 0.65 0.5 0.3 1.1 0.8 200 45 50 55 1.4 1.1 Output rise time (measured from 0.8 to 2.0V) Output fall time (measured at 2.0V to 0.8V) Jitter (cycle-to-cycle) Output duty cycle nS nS pS % tJC tD Note: 1. tLH and tHL are measured into a capacitive load of 15pF. Modulation Profile Rev. 2 | Page 4 of 7 | www.onsemi.com ASM3P2780A Typical Crystal Specifications Fundamental AT cut parallel resonant crystal Nominal frequency Frequency tolerance Operating temperature range Storage temperature Load capacitance(CP) Shunt capacitance ESR 33MHz 50 ppm or better at 25 C -25 to +85 C C -40 to +85 C C 18pF 7pF maximum 25 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 Rx 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 0.1F C2 2.2F VDD ASM3P2780A Rs ModOUT ModOUT Clock VSS Rev. 2 | Page 5 of 7 | www.onsemi.com ASM3P2780A Package Information 6L-TSOP Package Dimensions Symbol Min A A1 A2 b H D B e C L 0.0118 0 0.00 0.033 0.012 0.005 BSC 0.114 BSC 0.06 BSC 0.0374 BSC 0.11 BSC 0.02 4 0.30 0 Inches Max 0.04 0.004 0.036 0.02 0.00 0.84 0.30 Millimeters Min Max 1.00 0.10 0.90 0.50 0.127 BSC 2.90 BSC 1.60 BSC 0.950 BSC 2.80 BSC 0.50 4 Rev. 2 | Page 6 of 7 | www.onsemi.com ASM3P2780A Ordering Information Part Number ASM3P2780AF-06OR Marking G4L Package Type 6L-TSOP (6L-TSOT-23), TAPE & REEL, Pb Free Temperature 0 to +70 C 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. Licensed under US Patent #5,488,627 and #5,631,921. Note: This product utilizes US Patent #6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003. 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. 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. U.S Patent Pending; Timing-Safe and Active Bead are trademarks of PulseCore Semiconductor, a wholly owned subsidiary of ON Semiconductor. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81-3-5773-3850 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative |
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