MC74HC4046A
http://onsemi.com
11
Figure 14A. VCO Frequency (f
VCO
) as a Function
of the VCO Input Voltage (V
VCOIN
)
Figure 14B. VCO Frequency (f
VCO
) as a Function
of the VCO Input Voltage (V
VCOIN
)
V
CC
= 6.0 V
V
CC
= 4.5 V
V
CC
= 3.0 V
R1
=
3.0
k
W
C1
=
39
pF
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
23
21
19
17
15
13
11
9
7.0
V
VCOIN
(V)
(MHz)f
VCO
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
70
60
50
40
30
20
10
0
V
VCOIN
(V)
(KHz)f
VCO
V
CC
= 6.0 V
V
CC
= 4.5 V
V
CC
= 3.0 V
R1
=
3.0
k
W
C1
=
0.1
m
F
Figure 14C. VCO Frequency (f
VCO
) as a Function
of the VCO Input Voltage (V
VCOIN
)
Figure 14D. VCO Frequency (f
VCO
) as a Function
of the VCO Input Voltage (V
VCOIN
)
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
2.0
1.0
0
V
VCOIN
(V)
(MHz)f
VCO
V
CC
= 6.0 V
V
CC
= 4.5 V
V
CC
= 3.0 V
R1
=
300
k
W
C1
=
39
pF
4.5
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
1.0
V
VCOIN
(V)
(KHz)f
VCO
4.5
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
V
CC
= 6.0 V
V
CC
= 4.5 V
V
CC
= 3.0 V
R1
=
300
k
W
C1
=
0.1
m
F
Figure 15A. Frequency Linearity versus
R1, C1 and V
CC
Figure 15B. Definition of VCO Frequency Linearity
Δ f
VCO
(%)
2.0
1.0
−2.0
0
−1.0
10
0
10
1
10
2
10
3
R1 (kW)
R2
=
∞
;
D
V
=
0.5
V
C1
=
39
pF
C1
=
1.0
m
F
f
2
f
0
f
0
′
f
1
MIN 1/2 V
CC
MAX
DV = 0.5 V OVER THE V
CC
RANGE:
FOR VCO LINEARITY
f
0
′ = (f
1
+ f
2
) / 2
LINEARITY = (f
0
′ − f
0
) / f
0
′) x 100%
V
CC
=
4.5 V
6.0 V
3.0 V
4.5 V
6.0 V
3.0 V
