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IDT54FCT388915T70J Datasheet(PDF) 7 Page - Integrated Device Technology |
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IDT54FCT388915T70J Datasheet(HTML) 7 Page - Integrated Device Technology |
7 / 11 page IDT54/74FCT388915T 70/100/133/150 3.3V LOW SKEW PLL-BASED CLOCK DRIVER MILITARY AND COMMERCIAL TEMPERATURE RANGES 9.8 7 Figure 2. Recommended Loop Filter and Analog Isolation Scheme for the FCT388915T NOTES: 1. Figure 2 shows a loop filter and analog isolation scheme which will be effective in most applications. The following guidelines should be followed to ensure stable and jitter-free operation: a. All loop filter and analog isolation components should be tied as close to the package as possible. Stray current passing through the parasitics of long traces can cause undesirable voltage transients at the LF pin. b. The 10 µF low frequency bypass capacitor and the 0.1µF high frequency bypass capacitor form a wide bandwidth filter that will minimize the 388915T's sensitivity to voltage transients from the system digital VCC supply and ground planes. If good bypass techniques are used on a board design near components which may cause digital VCC and ground noise, VCC step deviations should not occur at the 388915T's digital VCC supply. The purpose of the bypass filtering scheme shown in figure 2 is to give the 388915T additional protection from the power supply and ground plane transients that can occur in a high frequency, high speed digital system. c. The loop filter capacitor (0.1 µF) can be a ceramic chip capacitor, the same as a standard bypass capacitor. 2. In addition to the bypass capacitors used in the analog filter of figure 2 there should be a 0.1 µF bypass capacitor between each of the other (digital) four VCC pins and the board ground plane. This will reduce output switching noise caused by the 388915T outputs, in addition to reducing potential for noise in the "analog" section of the chip. These bypass capacitors should also be tied as close to the 388915T package as possible. BOARD VCC 0.1 µF (Loop Filter Cap) Analog loop filter section of the FCT388915T 0.1 µF High Freq. Bypass 10 µF Low Freq. Bypass BOARD GND ANALOG VCC ANALOG GND LF A separate Analog power supply is not necessary and should not be used. Following these prescribed guidelines is all that is necessary to use the FCT388915 in a normal digital environment. 3052 drw 12 |
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