Datasheet

13
FIGURE 12. HC4046A TYPICAL CENTER FREQUENCY vs R1,
C1 (V
CC
= 4.5V)
FIGURE 13. HC4046A TYPICAL CENTER FREQUENCY vs R1,
C1 (V
CC
= 6V)
FIGURE 14. HC4046A TYPICAL CENTER FREQUENCY vs R1,
C1 (V
CC
= 3V, R2 = OPEN)
FIGURE 15. HCT4046A TYPICAL CENTER FREQUENCY vs R1,
C1 (V
CC
= 4.5V)
FIGURE 16. HCT4046A TYPICAL CENTER FREQUENCY vs R1,
C1 (V
CC
= 5.5V)
FIGURE 17. HC4046A TYPICAL VCO FREQUENCY vs VCO
IN
(R1 = 1.5MΩ, C1 = 50pF)
Typical Performance Curves (Continued)
10
8
10
7
10
6
10
5
10
4
10
3
10
2
10
1
110
10
2
10
3
10
4
10
5
10
6
CAPACITANCE, C1 (pF)
CENTER FREQUENCY (Hz)
VCO
IN
= 0.5 V
CC
V
CC
= 4.5V
R1 = 2.2K
R1 = 22K
R1 = 220K
R1 = 2.2M
R1 = 11M
10
8
10
7
10
6
10
5
10
4
10
3
10
2
10
1
110
10
2
10
3
10
4
10
5
10
6
CAPACITANCE, C1 (pF)
CENTER FREQUENCY (Hz)
VCO
IN
= 0.5 V
CC
V
CC
= 6.0V
R1 =3K
R1 = 30K
R1 =330K
R1 = 3M
R1 = 15M
10
8
10
7
10
6
10
5
10
4
10
3
10
2
10
1
110
10
2
10
3
10
4
10
5
10
6
CAPACITANCE, C1 (pF)
CENTER FREQUENCY (Hz)
VCO
IN
= 0.5 V
CC
V
CC
= 3.0V
R2 = OPEN
R1 = 1.5K
R1 = 15K
R1 = 150K
R1 = 1.5M
R1 = 7.5M
10
8
10
7
10
6
10
5
10
4
10
3
10
2
10
1
110
10
2
10
3
10
4
10
5
10
6
CAPACITANCE, C1 (pF)
CENTER FREQUENCY (Hz)
VCO
IN
= 0.5 V
CC
V
CC
= 4.5V
R1 = 2.2K
R1 = 22K
R1 = 220K
R1 = 2.2M
R1 = 11M
10
8
10
7
10
6
10
5
10
4
10
3
10
2
10
1
110
10
2
10
3
10
4
10
5
10
6
CAPACITANCE, C1 (pF)
CENTER FREQUENCY (Hz)
VCO
IN
= 0.5 V
CC
V
CC
= 5.5V
R1 = 3K
R1 = 30K
R1 = 300K
R1 = 3M
R1 = 15M
140
120
100
80
60
40
20
01 2 3456
VCO
IN
(V)
VCO FREQUENCY (kHz)
C1 = 50pF
R1 = 1.5M
V
CC
= 3V
V
CC
= 4.5V
V
CC
= 6V
CD74HC4046A, CD74HCT4046A