a-What is the purpose of the inductor in Figure 2-5? b-In Figure 2-6, VDDPLL and

Question

a-What is the purpose of the inductor in Figure 2-5?

b-In Figure 2-6, VDDPLL and VSSPLL have two capacitors in parallel attached to them. What is the ratio of the values of the two different capacitors? Why have capacitors of two different values been selected?

c-In Figure 2-6, what is the structure labeled “25M”?

80-pin LQFP Package of MCF52233 RSTO RS11 XTAL EXTAL VDDPLL VSSPLL +3.3V 10M | | 0.22F 4.7k 25M 270 15p 1000pF PLL Filter Reset CirctCrystal Oscillator Circuit ¡Circuit Figure 2-6 Reset Circuit, Crystal Oscillator Circuit and PLL Filter Circuit of The Hardware Minimum System of MCF52233

Explanation / Answer

a) The purpose of the inductor is frequency determination of the operation. Inductor with the capacitor determines the operation frequency of the circuit.

b) The ratio of the capacitors is 220:1 generally a bank of capacitors is used on the DC lines to eleminate the noise running at the DC.

c) The structure is a quartz crystal.

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