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843081AGI-01LF Datasheet(PDF) 7 Page - Integrated Device Technology |
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843081AGI-01LF Datasheet(HTML) 7 Page - Integrated Device Technology |
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7 / 16 page  REVISION C 11/5/15 843081I-01 DATA SHEET 7 FEMTOCLOCKS® CRYSTAL-TO- 3.3V, 2.5V LVPECL CLOCK MULTIPLIER APPLICATION INFORMATION As in any high speed analog circuitry, the power supply pins are vulnerable to random noise. The 843081I-01 pro- vides separate power supplies to isolate any high switching noise from the outputs to the internal PLL. V CC and VCCA should be individually connected to the power supply plane through vias, and bypass capacitors should be used for each pin. To achieve optimum jitter performance, power supply isolation is required. Figure 1 illustrates how a 10 Ω resistor along with a 10μF and a .01μF bypass capacitor should be connected to each V CCA pin. The 10 Ω resistor can also be replaced by a ferrite bead. POWER SUPPLY FILTERING TECHNIQUES FIGURE 1. POWER SUPPLY FILTERING 10 Ω V CCA 10 μF .01 μF 3.3V or 2.5V .01 μF V CC Figure 2. CRYSTAL INPUt INTERFACE CRYSTAL INPUT INTERFACE The 843081I-01 has been characterized with 18pF parallel resonant crystals. The capacitor values, C1 and C2, shown in Figure 2 below were determined using an 18pF parallel reso- nant crystal and were chosen to minimize the ppm error. The optimum C1 and C2 values can be slightly adjusted for different board layouts. ICS843081I-01 0 0 III-0 I-0 --- I-0 I 0 0 I-0 0 I 0 0 I 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 I 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 IIC C CS ICS CS C C CS C C C ICS S S S S CS CS C C CS CS CS S S S S S C CS C CS CS CS S S S S C CS C CS CS CS S S CS C C C CS S S CS CS S S S S S CS S S S CS CS CS S S S S S C CS S S CS C C CS S S C CS S C C CS S S S IC C CS CS S S843 843 843 843 8 8 843 843 843 4 84 43 3 3 3 843 3 8 8 843 843 843 843 84 4 4 4 43 3 3 3 843 8 843 843 84 843 84 4 4 43 843 843 3 843 84 8 843 8 8 84 4 4 4 43 3 8 84 4 84 43 4 84 43 8 8 84 4 4 4 43 8 8 8 843 84 4 4 4 4 43 3 3 8 8 84 4 4 4 43 3 3 8 843 843 3 8 8 843 8 8 8 843 3 3 8 8 843 4 43 3 3081 081 081 081 081 08 0 0 08 8 081 081 8 8 8 081 08 0 081 08 08 0 08 8 081 8 8 8 8 81 81 081 81 0 0 0 081 0 0 0 081 8 8 81 1 1 08 0 0 0 08 8 8 081 1 1 0 081 0 0 0 08 8 081 1 1 08 81 081 0 0 0 08 8 8 81 1 1 081 0 0 1 1 1 08 0 0 0 0 08 08 8 8 8 81 8 81 081 08 0 08 8 8 |
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