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CLKOUT Datasheet(PDF) 7 Page - Pericom Semiconductor Corporation |
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CLKOUT Datasheet(HTML) 7 Page - Pericom Semiconductor Corporation |
7 / 9 page 7 PI6C3622-1 Low Power Spread Spectrum Frequency Multiplier SSCG-GP Family PS8944A 01/30/08 Application Information Decoupling Capacitor Two decoupling capacitors of 0.1uF and 1nF must be connected in parallel between VDD and GND. To opti- mize device performance and to lower output noise, the coupling capacitors should be placed on the compo- nent side of the board as close to these pins as possible. There should be no vias placed between the decou- pling capacitors and VDD pin. The PCB trace to VDD pin should be as short as possible, and no vias should be placed between VDD and the capacitors in the decoupling circuit. VDD Strapping to high S0,S1, SSON VDD 0.1uF 1nF VDD Strapping to low S0,S1, SSON 0.1uF 1nF Crystal Load Capacitor If a crystal is used with the device, two external trim capacitors, CLtrim, are used to adjust the effective capac- itance to match the required crystal load capacitance. The CLtrim value can be derived from formula CLtrim = 2*CL – (Cs + Ci). The typical CLtrim = 28pF when crystal load = 18pF, stray capacitance Cs = 3pF and XTAL pins capacitance = 5pF. X1 Crystal C Ltrim C Ltrim X2 |
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