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U74HC4046AL-S16-R Datasheet(PDF) 15 Page - Unisonic Technologies

Part # U74HC4046AL-S16-R
Description  PHASE LOCKED LOOP WITH VCO
PDF  19 Pages
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Manufacturer  UTC [Unisonic Technologies]
Direct Link  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

U74HC4046AL-S16-R Datasheet(HTML) 15 Page - Unisonic Technologies

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U74HC4046A
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
15 of 19
www.unisonic.com.tw
QW-R502-461.C
APPLICATION INFORMATION
This is a reference for the values of external components to be used with the U74HC4046A in a PLL system.
The ranges of the values of the components:
VCO Frequency Without Extra Offset
(Phase comparator: PC1, PC2 or PC3)
Frequency Characteristic:
With R2 = ∞ and R1 between 3 kΩ and 300 kΩ, the characteristics of the VCO operation will be as shown in Fig.11
(Due to R1, C1 time constant a small offset remains when R2 = ∞).
Fig.11 Frequency characteristic of VCO operating without offset:
f0 = centre frequency; 2fL = frequency lock range.
Component
Value
R1
3 kΩ ~ 300 kΩ
R2
3 kΩ ~ 300 kΩD
R1+R2
Parallel value > 2.7 kΩ
C1
Greater than 40 pF



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