74HC4046 datasheet(11/16 Pages) ONSEMI

Part #	74HC4046

Description	Phase-Locked Loop

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MC74HC4046A

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11

Figure 14A. VCO Frequency (fVCO) as a Function

of the VCO Input Voltage (VVCOIN)

Figure 14B. VCO Frequency (fVCO) as a Function

of the VCO Input Voltage (VVCOIN)

VCC = 6.0 V

VCC = 4.5 V

VCC = 3.0 V

R1 = 3.0 k

Ω

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

VVCOIN (V)

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

VVCOIN (V)

VCC = 6.0 V

VCC = 4.5 V

VCC = 3.0 V

R1 = 3.0 k

Ω

C1 = 0.1

µF

Figure 14C. VCO Frequency (fVCO) as a Function

of the VCO Input Voltage (VVCOIN)

Figure 14D. VCO Frequency (fVCO) as a Function

of the VCO Input Voltage (VVCOIN)

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

2.0

1.0

0

VVCOIN (V)

VCC = 6.0 V

VCC = 4.5 V

VCC = 3.0 V

R1 = 300 k

Ω

C1 = 39 pF

4.5

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

1.0

VVCOIN (V)

4.5

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

VCC = 6.0 V

VCC = 4.5 V

VCC = 3.0 V

R1 = 300 k

Ω

C1 = 0.1

µF

Figure 15A. Frequency Linearity versus

R1, C1 and VCC

Figure 15B. Definition of VCO Frequency Linearity

2.0

1.0

–2.0

0

–1.0

10

0

101

102

103

R1 (k

Ω)

R2 =

∞; ∆V = 0.5 V

C1 = 39 pF

C1 = 1.0

µF

f2

f0

f0′

f1

MIN

1/2 VCC

MAX

∆V = 0.5 V OVER THE VCC RANGE:

FOR VCO LINEARITY

f0′ = (f1 + f2) / 2

LINEARITY = (f0′ – f0) / f0′) x 100%

VCC=

4.5 V

6.0 V

3.0 V

4.5 V

6.0 V

3.0 V

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