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| January 2005 rev 1.5 Low Power Peak EMI Reducing Solution Features Generates an EMI optimized clock signal at the output. Integrated loop filter components. Operates with a 3.3V /2.5V supply. Operating current less than 4mA. Low power CMOS design. Input frequency range: 6MHz to 12MHz for 2.5V : 6MHz to 13MHz for 3.3V Generates a 1X low EMI spread spectrum clock of the input frequency. Frequency deviation: 1%(Typ) @ 10MHz Input Frequency Available in 6-pin TSOT-23, 8-pin SOIC and 8-pin TSSOP packages. ASM3P2869A The ASM3P2869A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method. The ASM3P2869A 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 ASM3P2869A is targeted towards all portable devices with very low power requirements like MP3 players, Notebooks and digital still cameras. Product Description The ASM3P2869A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. The ASM3P2869A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of all clock dependent signals. The ASM3P2869A allows significant system cost savings by reducing the number of circuit board layers ferrite beads, 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 = 2.5V / 3.3V 200 pS ( Max) 45/55% (worst case) FIN/256 1% (Typ) @ 10MHz Block Diagram VDD XIN XOUT Crystal Oscillator Frequency Divider Feedback Divider REFOUT Modulation PLL Phase Detector Loop Filter VCO Output Divider ModOUT VSS Alliance Semiconductor 2575, Augustine Drive * Santa Clara, CA * Tel: 408.855.4900 * Fax: 408.855.4999 * www.alsc.com Notice: The information in this document is subject to change without notice. January 2005 rev 1.5 Pin Configuration (6-pin TSOT-23 Package) ASM3P2869A REFOUT 1 XOUT 2 XIN / CLKIN 3 6 VSS ModOUT VDD ASM3P2869A 5 4 Pin# 1 2 3 4 5 6 Pin Name REFOUT XOUT XIN / CLKIN VDD ModOUT VSS Type O O I P O P Description Buffered output of the input frequency. 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. Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 2 of 11 January 2005 rev 1.5 Pin Configuration (8-pin SOIC and TSSOP Package) XIN / CLKIN 1 XOUT 2 REFOUT 3 NC 4 8 7 6 5 ASM3P2869A VDD NC ModOUT VSS ASM3P2869A Pin Description Pin# 1 2 3 4 5 6 7 8 Pin Name XIN / CLKIN XOUT REFOUT NC VSS ModOUT NC VDD Type I O O P O P Description 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. Crystal connection. If using an external reference, this pin must be left unconnected. Buffered output of the input frequency. No connect. Ground connection. Spread spectrum clock output. No connect. Power supply for the entire chip Modulation Profile Specifications Description Frequency Range For 2.5V Supply For 3.3V Supply Specification 6MHz < CLKIN < 12MHz 6MHz < CLKIN < 13MHz FIN/256 1% (Typ) @ 10MHz Modulation Equation Frequency Deviation Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 3 of 11 January 2005 rev 1.5 Absolute Maximum Ratings Symbol VDD, VIN TSTG TA Ts TJ TDV Storage temperature Operating temperature Max. Soldering Temperature (10 sec) Junction Temperature Static Discharge Voltage (As per MIL-STD-883, Method 3015) ASM3P2869A Parameter Rating 0.5 to +7.0 -65 to +125 0 to 70 260 150 2 Unit V C C C C KV Voltage on any pin with respect to Ground 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. DC Electrical Characteristics for 2.5V Supply (Test condition: All parameters are measured at room temperature (+25C) unless otherwise stated) 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 Parameter Min GND - 0.3 2.0 - - - - - 1.8 - - 2.375 - - Typ - - - - 3 3 - - 1.0 3.0 2.5 - 50 Max 0.8 VDD + 0.3 -35 35 0.6 - - - 2.625 5 - Unit V V OA OA mA mA V V mA mA V mS R XOUT output low current (@0.5V, VDD=2.5V) XOUT output high current (@1.8V, VDD=2.5V) Output low voltage (VDD = 2.5 V, IOL = 8 mA) Output high voltage (VDD = 2.5 V, IOH = 8 mA) Static supply current * Dynamic supply current (2.5V, 10MHz and no load) Operating voltage Power-up time (first locked cycle after power-up) Output impedance * XIN / CLKIN pin is pulled low AC Electrical Characteristics for 2.5V Supply Symbol Parameter CLKIN ModOUT fd tLH* tHL* tJC tD Input frequency Output frequency Frequency Deviation Input Frequency = 6MHz Input Frequency =12MHz Min 6 6 - - 0.5 - 45 Typ - - - - 1.5 1.0 - 50 Max 12 12 1.6 0.78 1.7 1.2 200 55 Unit MHz MHz % nS nS pS % 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 * tLH and tHL are measured into a capacitive load of 15pF Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 4 of 11 January 2005 rev 1.5 DC Electrical Characteristics for 3.3V Supply (Test condition: All parameters are measured at room temperature (+ 25C) unless otherwise stated) ASM3P2869A 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 Parameter Min GND - 0.3 2.0 - - - - - 2.5 - - 2.7 - - Typ - - - - 3 3 - - 1.3 4.0 3.3 - 45 Max 0.8 VDD + 0.3 -35 35 - - 0.4 - - - 3.6 5 - Unit V V OA OA mA mA V V mA mA V mS R 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 = 8 mA) Output high voltage (VDD = 3.3 V, IOH = 8 mA) Static supply current * Dynamic supply current (3.3V, 10MHz and no load) Operating voltage Power-up time (first locked cycle after power-up) Output impedance * XIN / CLKIN pin is pulled low AC Electrical Characteristics for 3.3V Supply Symbol Parameter CLKIN ModOUT fd tLH* tHL* tJC tD Input frequency Output frequency Frequency Deviation Input Frequency = 6MHz Input Frequency = 13MHz Min 6 6 - - 0.5 0.4 - 45 Typ - - - - 1.4 1.0 - 50 Max 13 13 1.6 0.77 1.6 1.2 200 55 Unit MHz MHz % nS nS pS % 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 *tLH and tHL are measured into a capacitive load of 15pF Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 5 of 11 January 2005 rev 1.5 Typical Crystal Oscillator Circuit ASM3P2869A Crystal R1 = 510R C1 = 27 pF C2 = 27 pF Typical Crystal Specifications Fundamental AT cut parallel resonant crystal Nominal frequency Frequency tolerance Operating temperature range Storage temperature Load capacitance Shunt capacitance ESR 8.000 MHz 50 ppm or better at 25C -25C to +85C -40C to +85C 18pF 7pF maximum 25 Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 6 of 11 January 2005 rev 1.5 Package Information 6-pin TSOT-23 Package ASM3P2869A Dimensions Symbol Min A A1 A2 b H D B e C L S 0.00 0.033 0.012 Inches Max 0.04 0.004 0.036 0.02 Millimeters Min Max 1.00 0.00 0.84 0.30 0.127 BSC 2.90 BSC 1.60 BSC 0.950 BSC 2.80 BSC 0.30 0 0.50 4 0.10 0.90 0.50 0.005 BSC 0.114 BSC 0.06 BSC 0.0374 BSC 0.11 BSC 0.0118 0 0.02 4 Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 7 of 11 January 2005 rev 1.5 ASM3P2869A 8-Pin SOIC Package E H D A2 A C e B A 1 D L Dimensions Symbol Min A1 A A2 B C D E e H L S 0.004 0.053 0.049 0.012 0.007 Inches Max 0.010 0.069 0.059 0.020 0.010 Millimeters Min 0.10 1.35 1.25 0.31 0.18 4.90 BSC 3.91 BSC 1.27 BSC 6.00 BSC 0.41 0 1.27 8 Max 0.25 1.75 1.50 0.51 0.25 0.193 BSC 0.154 BSC 0.050 BSC 0.236 BSC 0.016 0 0.050 8 Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 8 of 11 January 2005 rev 1.5 ASM3P2869A 8-Pin TSSOP Package H E D A2 A C e B A1 L Dimensions Symbol Min A A1 A2 B c D E e H L S 0.020 0 0.002 0.033 0.008 0.004 0.114 0.169 0.026 BSC 0.252 BSC 0.028 8 0.50 0 Inches Max 0.043 0.006 0.037 0.012 0.008 0.122 0.177 0.05 0.85 0.19 0.09 2.90 4.30 Millimeters Min Max 1.10 0.15 0.95 0.30 0.20 3.10 4.50 0.65 BSC 6.40 BSC 0.70 8 Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 9 of 11 January 2005 rev 1.5 Ordering Information Part Number ASM3P2869AF-06OR ASM3P2869AF-08TT ASM3P2869AF-08TR ASM3P2869AF-08ST ASM3P2869AF-08SR ASM3P2869A-06OR ASM3P2869A-08TT ASM3P2869A-08TR ASM3P2869A-08ST ASM3P2869A-08SR ASM3P2869A Marking K4LL 3P2869AFT 3P2869AFT 3P2869AFS 3P2869AFS K1LL 3P2869AT 3P2869AT 3P2869AS 3P2869AS Package Type 6-Pin TSOT-23, TAPE & REEL, Pb Free 8-Pin TSSOP, TUBE, Pb Free 8-Pin TSSOP, TAPE & REEL, Pb Free 8-Pin SOIC, TUBE, Pb Free 8-Pin SOIC, TAPE & REEL, Pb Free 6-Pin TSOT-23, TAPE & REEL 8-Pin TSSOP, TUBE 8-Pin TSSOP, TAPE & REEL 8-Pin SOIC, TUBE 8-Pin SOIC, TAPE & REEL Temperature Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Device Ordering Information ASM3P2869AF-08TR OR - TSOT23-6, T/R TT - TSSOP, TUBE TR - TSSOP, T/R VT - TVSOP, TUBE VR - TVSOP, T/R ST - SOIC, TUBE SR - SOIC, T/R QR - QFN, T/R QT - QFN, TUBE BT - BGA, TUBE BR - BGA, T/R PIN COUNT LEAD FREE PART PART NUMBER X = Automotive (-40C to +125C) I = Industrial (-40C to +85C) P or n/c = Commercial (0C to +70C) 1 - reserved 2 - Non PLL based 3 - EMI Reduction 4 - DDR support products 5 - STD Zero Delay Buffer 6 - power management 7 - power management 8 - power management 9 - Hi performance 0 - reserved Alliance Semiconductor Mixed Signal Product Licensed under U.S Patent Nos 5,488,627 and 5,631,921 Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 10 of 11 |
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