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ICS8732-01 Datasheet(PDF) 9 Page - Integrated Device Technology |
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ICS8732-01 Datasheet(HTML) 9 Page - Integrated Device Technology |
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9 / 17 page  8732AY-01 www.idt.com REV. E MAY 2, 2013 9 ICS8732-01 LOW VOLTAGE, LOW SKEW 3.3V LVPECL CLOCK GENERATOR FIGURE 4C. CLK/NCLK INPUT DRIVEN BY 3.3V LVPECL DRIVER FIGURE 4B. CLK/NCLK INPUT DRIVEN BY 3.3V LVPECL DRIVER FIGURE 4D. CLK/NCLK INPUT DRIVEN BY 3.3V LVDS DRIVER 3.3V R1 50 R3 50 Zo = 50 Ohm LVPECL Zo = 50 Ohm HiPerClockS CLK nCLK 3.3V Input R2 50 Zo = 50 Ohm Input HiPerClockS CLK nCLK 3.3V R3 125 R2 84 Zo = 50 Ohm 3.3V R4 125 LVPECL R1 84 3.3V DIFFERENTIAL CLOCK INPUT INTERFACE The CLK /nCLK accepts LVDS, LVPECL, LVHSTL, SSTL, HCSL and other differential signals. Both V SWING and VOH must meet the V PP and VCMR input requirements. Figures 4A to 4D show interface examples for the CLK/nCLK input driven by the most common driver types. The input interfaces suggested here are examples only. Please consult with the vendor of the driver FIGURE 4A. CLK/NCLK INPUT DRIVEN BY LVHSTL DRIVER 1.8V R2 50 Input LVHSTL Driver ICS HiPerClockS R1 50 LVHSTL 3.3V Zo = 50 Ohm Zo = 50 Ohm HiPerClockS CLK nCLK Zo = 50 Ohm R1 100 3.3V LVDS_Driv er Zo = 50 Ohm Receiv er CLK nCLK 3.3V As in any high speed analog circuitry, the power supply pins are vulnerable to random noise. The ICS8732-01 provides separate power supplies to isolate any high switching noise from the outputs to the internal PLL. V CC, VCCA and VCCO 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 3 illustrates how a 10 Ω resistor along with a 10 μF and a .01μF bypass capacitor should be connected to each V CCA pin. FIGURE 3. POWER SUPPLY FILTERING 10 Ω V CCA 10 μF .01 μF 3.3V .01 μF V CC POWER SUPPLY FILTERING TECHNIQUES component to confirm the driver termination requirements. For example in Figure 4A, the input termination applies for LVHSTL drivers. If you are using an LVHSTL driver from another vendor, use their termination recommendation. |
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