CD74HC4046A Datasheet, PDF (17/28 Pages) Texas Instruments – High-Speed CMOS Logic Phase-Locked Loop with VCO

CD54HC4046A, CD74HC4046A, CD54HCT4046A, CD74HCT4046A
Typical Performance Curves (Continued)
f
f₂
f₀
∆V = 0.5V OVER THE V_CC RANGE:
f₀
FOR VCO LINEARITY
f’_o = f₁ + f₂
f₁
2
LINEARITY =
f’_o - f_o
f’_o
x 100%
∆V
∆V
MIN
1/2V_CC MAX
V_VCOIN
FIGURE 33. DEFINITION OF VCO FREQUENCY LINEARITY
8
C1 = 50pF
6 ^VCC ^{= 4.5V}
R2 = OPEN
4
VCO_IN = 2.25V ± 1V
2
0
VCO_IN = 2.25V ± 0.45V
-2
-4
-6
-8
1K
10K
100K
1M
10M
R1 (OHMS)
FIGURE 34. HC4046A VCO LINEARITY vs R1 (V_CC = 4.5V)
8
C1 = 50pF
6 ^VCC ^{= 3V}
R2 = OPEN
4
2
VCO_IN = 1.50V ± 0.4V
0
VCO_IN = 1.50V ± 0.3V
-2
-4
-6
-8
1K
10K
100K
1M
10M
R1 (OHMS)
FIGURE 35. HC4046A VCO LINEARITY vs R1 (V_CC = 3V)
8
C1 = 50pF
6 ^VCC ^{= 6V}
R2 = OPEN
4
2
0
VCO_IN = 3V ± 1.5V
-2
-4
VCO_IN = 3V ± 0.6V
-6
-8
1K
10K
100K
1M
10M
R1 (OHMS)
FIGURE 36. HC4046A VCO LINEARITY vs R1 (V_CC = 6V)
8
V_CC = 5.5V,
6 ^{VCOIN = 2.75V ±1.3V}
V_CC = 4.5V,
4 ^{VCOIN = 2.25V ±1.0V}
2
0
-2
V_CC = 5.5V,
VCO_IN = 2.75V ±0.55V
-4
V_CC = 4.5V,
-6
VCO_IN = 2.25V ±0.45V _{C1 = 50pF}
R2 = OPEN
-8
1K
10K
100K
1M
10M
R1 (OHMS)
FIGURE 37. HCT4046A VCO LINEARITY vs R1 (V_CC = 4.5V,
V_CC = 5.5V)
10⁴
VCO_IN = 0.5 V_CC
10³
10²
10
V_CC = 6V
V_CC = 3V
V_CC = 4.5V
1
1K
10K
100K
1M
RS (OHMS)
FIGURE 38. HC4046A DEMODULATOR POWER DISSIPATION
vs RS (TYP) (V_CC = 3V, 4.5V, 6V)
17