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