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5V50009DCG8 Datasheet(PDF) 3 Page - Integrated Device Technology |
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5V50009DCG8 Datasheet(HTML) 3 Page - Integrated Device Technology |
3 / 8 page IDT5V50009 SPREAD SPECTRUM CLOCK GENERATOR SSCG IDT™ SPREAD SPECTRUM CLOCK GENERATOR 3 IDT5V50009 REV C 040609 External Components The IDT5V50009 requires a minimum number of external components for proper operation. Decoupling Capacitor A decoupling capacitor of 0.01µF must be connected between VDD and GND, as close to these pins as possible. For optimum device performance, the decoupling capacitor should be mounted on the component side of the PCB. Avoid the use of vias in the decoupling circuit. Series Termination Resistor When the PCB trace between the clock output and the load is over 1 inch, series termination should be used. To series terminate a 50 Ω trace (a commonly used trace impedance) place a 33 Ωresistor in series with the clock line, as close to the clock output pin as possible. The nominal impedance of the clock output is 20 Ω. PCB Layout Recommendations For optimum device performance and lowest output phase noise, the following guidelines should be observed. 1) The 0.01µF decoupling capacitor should be mounted on the component side of the board as close to the VDD pin as possible. No vias should be used between the decoupling capacitor and VDD pin. The PCB trace to VDD pin should be kept as short as possible, as should the PCB trace to the ground via. 2) To minimize EMI, the 33 Ω series termination resistor (if needed) should be placed close to the clock output. 3) An optimum layout is one with all components on the same side of the board, minimizing vias through other signal layers. Other signal traces should be routed away from the IDT5V50009. This includes signal traces just underneath the device, or on layers adjacent to the ground plane layer used by the device. Crystal Information The crystal used should be a fundamental mode (do not use third overtone), parallel resonant. Crystal capacitors should be connected from pins X1 to ground and X2 to ground to optimize the initial accuracy. The value of these capacitors is given by the following equation: Crystal caps (pF) = (CL - 6) x 2 In the equation, CL is the crystal load capacitance. So, for a crystal with a 16 pF load capacitance, two 20 pF [(16-6) x 2] capacitors should be used. Spread Spectrum Profile The IDT5V50009 low EMI clock generator uses an optimized frequency slew rate algorithm to facilitate down stream tracking of zero delay buffers and other PLL devices. The frequency modulation amplitude is constant with variations of the input frequency. Ti m e Modulation Rate |
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