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CD74HC7046AMM Datasheet(PDF) 20 Page - Texas Instruments

Part # CD74HC7046AMM
Description  Phase-Locked Loop with VCO and Lock Detector
PDF  29 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

CD74HC7046AMM Datasheet(HTML) 20 Page - Texas Instruments

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Application Information
This information is a guide for the approximation of values of
external components to be used with the CD74HC7046A
and CD74HCT7046A in a phase-lock-loop system.
References should be made to Figures 13 through 23 and
Figures 36 through 41 as indicated in the table.
Values of the selected components should be within the fol-
lowing ranges:
HC/HCT7046A CPD
CHIP SECTION
HC
HCT
UNIT
Comparator 1
48
50
pF
Comparator 2
39
48
pF
VCO
61
53
pF
R1
> 3k
Ω;
R2
> 3k
Ω;
R1 || R2
parallel value > 2.7k
Ω;
C1
greater than 40pF
SUBJECT
PHASE
COMPARATOR
DESIGN CONSIDERATIONS
VCO Frequency
Without Extra Offset
(R2 =
∞)
PC1 or PC2
VCO Frequency Characteristic
The characteristics of the VCO operation are shown in Figures 13 - 23.
PC1
Selection of R1 and C1
Given fo, determine the values of R1 and C1 using Figures 13 - 17.
PC2
Given fMAX calculate fo as fMAX/2 and determine the values of R1 and C1 using Figures 13 - 17.
To obtain 2fL: 2fL
≈
where 0.9V < VCOIN < VCC - 0.9V is the range of ∆VCOIN
VCO Frequency with
Extra Offset
(R2 > 3k
Ω)
PC1 or PC2
VCO Frequency Characteristic
The characteristics of the VCO operation are shown in Figures 29 - 32.
PC1 or PC2
Selection of R1, R2 and C1
Given fo and fL, offset frequency, fMIN, may be calculated from fMIN
≈ f
o - 1.6 fL.
Obtain the values of C1 and R2 by using Figures 29 - 32.
Calculate the values of R1 from Figures 33 - 34.
FIGURE 46. FREQUENCY CHARACTERISTIC OF VCO OPERATING WITHOUT
OFFSET: fo = CENTER FREQUENCY: 2fL = FREQUENCY LOCK RANGE
fMAX
fVCO
fo
fMIN
MIN
1/2 VCC VVCOIN
MAX
2fL
2(
∆VCOIN)
R1C1
FIGURE 47. FREQUENCY CHARACTERISTIC OF VCO OPERATING WITH OFFSET:
fo = CENTER FREQUENCY: 2fL = FREQUENCY LOCK RANGE
fMAX
fVCO
fo
fMIN
MIN
1/2 VCC
VVCOIN
MAX
2fL
CD74HC7046A, CD74HCT7046A



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