Datasheet

1997 Nov 25 28
Philips Semiconductors Product specification
Phase-locked-loop with VCO 74HC/HCT4046A
Fig.29 Typical value of VCO centre frequency (f
o
) as a function of C1: R2 = ∞; V
VCOIN
= 1/2 V
CC
; INH = GND;
T
amb
=25°C.
To obtain optimum VCO performance, C1 must be as small as possible but larger than 100 pF.
Interpolation for various values of R1 can be easily calculated because a constant R1C1 product will produce almost the same VCO output frequency.