HCC4046B STMicroelectronics, HCC4046B Datasheet - Page 3

• Manufacturer Part Number: HCC4046B
• Description: MICRMICROPOWER PHASE-LOCKED LOOP _
• Manufacturer: STMicroelectronics

input over the full VCO frequency range. Moreover,
the power dissipation due to the low-pass filter is re-
duced when this type of phase comparator is used
because both the p- and n-type output drivers are
OFF for most of the signal input cycle. It should be
noted that the PLL lock range for this type of phase
Figure a : Phase-Comparator I Characteristics at
Figure C : Typical Waveforms For COS/MOS Phase-locked Loop Employing Phase Comparator II In
Low-Pass Filter Output.
Locked Condition.
comparator is equal to the capture range, inde-
pendent of the low-pass filter. With no signal present
at the signal input, the VCO is adjusted to its lowest
frequency for phase comparator II. Fig. (c) shows
typical waveforms for a COS/MOS PLL employing
phase comparator II in a locked condition.
Figure b : Typical Waveforms for COS/MOS Phase
Locked-Loop Employing Phase Com-
parator I in Locked Condition of f
HCC/HCF4046B
o.
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