Datasheet

16
FIGURE 30. HCT4046A OFFSET FREQUENCY vs R2, C1
(V
CC
= 4.5V)
FIGURE 31. HC4046A AND HCT4046A OFFSET FREQUENCY
vs R2, C1 (V
CC
= 6V, V
CC
= 5.5V)
FIGURE 32. HC4046A f
MIN
/f
MAX
vs R2/R1 (V
CC
= 3V, 4.5V, 6V) FIGURE 33. HCT4046A f
MAX
/f
MIN
vs R2/R1 (V
CC
= 4.5V TO 5.5V)
FIGURE 34. DEFINITION OF VCO FREQUENCY LINEARITY FIGURE 35. HC4046A VCO LINEARITY vs R1 (V
CC
= 4.5V)
Typical Performance Curves (Continued)
VCO
IN
= 0.5 V
CC
V
CC
= 4.5V
110
10
2
10
3
10
4
10
5
10
6
CAPACITANCE, C1 (pF)
10
8
10
7
10
6
10
5
10
4
10
3
10
2
10
1
OFFSET FREQUENCY (Hz)
R2 = 2.2K
R2 = 22K
R2 = 220K
R2 = 2.2M
R2 = 11M
110
10
2
10
3
10
4
10
5
10
6
CAPACITANCE, C1 (pF)
10
8
10
7
10
6
10
5
10
4
10
3
10
2
10
1
OFFSET FREQUENCY (Hz)
R2 = 3K
R2 = 30K
R2 = 300K
R2 = 3M
R2 = 15M
VCO
IN
= 0.5 V
CC
HC V
CC
= 6V
HCT V
CC
= 5.5V
PIN 9 = 0.95 V
CC
FOR f
MAX
PIN 9 = 0V FOR f
MIN
V
CC
= 3V, 4.5V, 6V
10
2
10
f
MAX
/f
MIN
0
10
-2
10
-1
1
R2/R1
10
2
10
PIN 9 = 0.95 V
CC
FOR f
MAX
PIN 9 = 0V FOR f
MIN
V
CC
= 4.5V TO 5.5V
10
2
10
f
MAX
/f
MIN
0
10
-2
10
-1
1
R2/R1
10
2
10
f
f
2
f
0
f
0
f
1
∆V
1/2V
CC
V
VCOIN
MIN MAX
∆V
∆V = 0.5V OVER THE V
CC
RANGE:
FOR VCO LINEARITY
f’
o
= f
1
+ f
2
2
LINEARITY =
f’
o
- f
o
f’
o
x 100%
1K 10K
100K 1M 10M
R1 (OHMS)
8
6
4
2
0
-2
-4
-6
-8
LINEARITY (%)
VCO
IN
= 2.25V ± 1V
C1 = 50pF
V
CC
= 4.5V
R2 = OPEN
VCO
IN
= 2.25V ± 0.45V
CD74HC4046A, CD74HCT4046A