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MB15C02
(d) Lock detector
The lock detector detects the lock and unlock states of the PLL. The lock detector outputs “H” when the PLL
enters the lock state and outputs “L” when the PLL enters the unlock state as shown in Figure 2. When PS =
“L”, the lock detector outputs “H” compulsorily.
Figure 2. Phase comparator input/output waveforms (Lock detector)
fr
fp
LD