參數(shù)資料
型號(hào)： CD74HC4046APWTE4
廠商： Texas Instruments
文件頁(yè)數(shù)： 11/34頁(yè)
文件大小： 0K
描述： IC PLL W/VCO 16-SSOP
標(biāo)準(zhǔn)包裝： 250
系列： 74HC
類(lèi)型： 鎖相環(huán)路（PLL）
PLL： 是
輸入： CMOS
輸出： CMOS
電路數(shù)： 1
比率 - 輸入:輸出： 1:4
差分 - 輸入:輸出： 無(wú)/無(wú)
頻率 - 最大： 38MHz
除法器/乘法器： 無(wú)/無(wú)
電源電壓： 2 V ~ 6 V
工作溫度： -55°C ~ 125°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 16-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 16-TSSOP
包裝： 帶卷 (TR)
19
Application Information
This information is a guide for the approximation of values of
external components to be used with the ’HC4046A and
’HCT4046A in a phase-lock-loop system.
References should be made to Figures 11 through 15 and
Figures 27 through 32 as indicated in the table.
Values of the selected components should be within the
following ranges:
HC/HCT4046A CPD
CHIP SECTION
HC
HCT
UNIT
Comparator 1
48
50
pF
Comparators 2 and 3
39
48
pF
VCO
61
53
pF
R1
Between 3k
and 300k
R2
Between 3k
and 300k
R1 + R2
Parallel Value > 2.7k
C1
Greater Than 40pF
SUBJECT
PHASE
COMPARATOR
DESIGN CONSIDERATIONS
VCO Frequency
Without Extra Offset
PC1, PC2 or PC3
VCO Frequency Characteristic
With R2 =
∞ and R1 within the range 3k < R1 < 300k, the characteristics of the VCO
operation will be as shown in Figures 11 - 15. (Due to R1, C1 time constant a small offset
remains when R2 =
∞.)
PC1
Selection of R1 and C1
Given fo, determine the values of R1 and C1 using Figures 11 - 15
PC2 or PC3
Given fMAX calculate fo as fMAX/2 and determine the values of R1 and C1 using Figures 11 -
15. To obtain 2fL:2fL
≈ 1.2 (V
CC - 1.8V)/(R1C1) where valid range of VCOIN is 1.1V < VCOIN
< VCC - 0.9V
VCO Frequency with
Extra Offset
PC1, PC2 or PC3
VCO Frequency Characteristic
With R1 and R2 within the ranges 3k
< R1 < 300k,3k, < R2 < 300k, the characteristics
of the VCO operation will be as shown in Figures 27 - 32.
PC1, PC2 or PC3
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 27 - 30.
Calculate the values of R1 from Figures 31 - 32.
FIGURE 44. 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
FIGURE 45. 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
CD54HC4046A, CD74HC4046A, CD54HCT4046A, CD74HCT4046A
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