PDF ASM3P2760A Data sheet ( Hoja de datos )

Número de pieza	ASM3P2760A
Descripción	Peak EMI Reducing Solution
Fabricantes	ON Semiconductor
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No Preview Available ! ASM3P2760A Peak EMI Reducing Solution Product Description The ASM3P2760A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. The ASM3P2760A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of all clock dependent signals. The ASM3P2760A 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. The ASM3P2760A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method. The ASM3P2760A 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.’ Features • Generates an EMI Optimized Clock Signal at the Output • Integrated Loop Filter Components • Operates with a 2.5/3.3 V Supply • Operating Current less than 4 mA • CMOS Design • Input Frequency Range: ♦ 6 MHz to 12 MHz for 2.5 V ♦ 6 MHz to 13 MHz for 3.3 V • Generates a 1x Low EMI Spread Spectrum Clock of the Input Frequency • Frequency Deviation: ±0.65% @ 8 MHz • Available in TSOP−6 Package • This Device is Pb-Free and is RoHS Compliant Applications The ASM3P2760A is targeted towards all portable devices like MP3 players and digital still cameras. Table 1. KEY SPECIFICATIONS Description Supply Voltages Cycle-to-Cycle Jitter Output Duty Cycle Modulation Rate Equation Frequency Deviation Specification VDD = 2.5/3.3 V ±200 ps (Typ) 45/55% FIN/256 ±0.65% @ 8 MHz www.onsemi.com 1 TSOP−6 CASE 318G PIN CONNECTION PD 1 6 VSS XOUT 2 ASM3P2760A 5 ModOUT XIN/CLKIN 3 4 VDD MARKING DIAGRAM E4LAYWG G 1 E4L = Specific Device Code A = Assembly Location Y = Year W = Work Week G = Pb-Free Package (Note: Microdot may be in either location) ORDERING INFORMATION See detailed ordering and shipping information on page 6 of this data sheet. © Semiconductor Components Industries, LLC, 2015 July, 2015 − Rev. 3 1 Publication Order Number: ASM3P2760/D 1 page ASM3P2760A Table 9. TYPICAL CRYSTAL SPECIFICATIONS Fundamental AT Cut Parallel Resonant Crystal Rating Nominal Frequency 8 MHz Frequency Tolerance ±50 ppm or Better at 25°C Operating Temperature Range −25 to +85°C Storage Temperature −40 to +85°C Load Capacitance (CP) Shunt Capacitance 18 pF 7 pF Maximum ESR 25 W NOTE: CL is Load Capacitance and Rx is used to prevent oscillations at overtone frequency of the Fundamental frequency. R Crystal Rx CL CL CL = 2 ⋅ (CP − CS) Where: CL = Load Capacitance of Crystal CS = Stray Capacitance due to CIN, PCB, Trace, etc. Figure 3. Typical Crystal Interface Circuit VDD C1 0.1 mF VDD C2 2.2 mF ASM3P2760A ModOUT Rs ModOUT Clock VSS Figure 4. Typical Application Schematic www.onsemi.com 5 5 Page

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