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HCF4046BEY Datasheet(PDF) 9 Page - STMicroelectronics |
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HCF4046BEY Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 13 page DESIGN INFORMATION This information is a guide for approximating the values of external components for the HCC/HCF 4046B in a Phase-Locked-Loop system. The selected external components must be within the following ranges : 5k Ω ≤ R1, R2, RS ≤ 1MΩ C1 ≥ 100pF at VDD ≥ 5V C1 ≥ 50pF at VDD ≥ 10V CHARACTERISTICS USING PHASE COMPARATOR I USING PHASE COMPARATOR II VCO WITHOUT OFFSET R2 = ∞ VCO WITH OFFSET VCO WITHOUT OFFSET R2 = ∞ VCO WITH OFFSET VCO Frequency For No Signal Input VCO in PLL System will Adjust to centre frequency fo VCO in PLL System will Adjust to Lowest Operating Frequency fmin Frequency Lock Range, 2 fL 2fL = full VCO frequency range 2fL =fmax -fmin Frequency Capture Range, 2 fC fC =fL Loop Filter Component Selection Phase Angle Between Signal and Comparator 90 o at Centre Frequency (fo), approximating 0 o and 180o at ends of lock range (2 fL) Always 0 o in lock Locks on Harmonics of Centre Frequency Yes No Signal Input Noise Rejection High Low * G.S. Mosckytz ”miniaturized RC fil ters using phase Lockedloop” BSTJ, may 1965 HCC/HCF4046B 9/13 |
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