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Note:
The formulas are derived from a Worksheet (Lotus 1-2-3) by Phillips™. It is highly recommended that you build a prototype to verify the results !
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calc_03.php   7610 Bytes    15-08-2016 16:50:55


74HC/HCT4046A : VCO Calculator




4046

DRAWING COURTESY OF NXP.



R1 [kΩ]  

    3 kΩ < R1 < 300 kΩ

R2 [kΩ]  

    3 kΩ < R2 < 300 kΩ

C1 [pF]  

    40 pF < C

FREQ.MIN [kHz]

    VTUN = 1.1 V

FREQ.TYP [kHz]

    VTUN = 2.5 V

FREQ.MAX [kHz]

    VTUN = 3.9 V

KVCO

    kHz/V

   

 

A Supply Voltage of 5 V is assumed. Changes affects the Frequencies !





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t1 = 3876 d

t2 = 560 ms

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