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| 型號： | CD74HC4046AEE4 |
| 廠商： | Texas Instruments |
| 文件頁數(shù)： | 11/34頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC PLL W/VCO 16-DIP |
| 標準包裝： | 25 |
| 系列： | 74HC |
| 類型： | 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/無 |
| 頻率 - 最大： | 38MHz |
| 除法器/乘法器： | 無/無 |
| 電源電壓： | 2 V ~ 6 V |
| 工作溫度： | -55°C ~ 125°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 16-DIP（0.300"，7.62mm） |
| 供應商設備封裝： | 16-PDIP |
| 包裝： | 管件 |
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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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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| CD74HC4046AEG4 | 功能描述:IC PLL W/VCO 16-DIP 制造商:texas instruments 系列:74HC 包裝:管件 零件狀態(tài):在售 類型: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/無 頻率 - 最大值:38MHz 分頻器/倍頻器:無/無 電壓 - 電源:2 V ~ 6 V 工作溫度:-55°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 供應商器件封裝:16-PDIP 基本零件編號:74HC4046 標準包裝:25 |
| CD74HC4046AM | 功能描述:鎖相環(huán) - PLL PLL w/ VCO RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
| CD74HC4046AM | 制造商:Texas Instruments 功能描述:74HC CMOS SMD 74HC4046 SOIC16 |
| CD74HC4046AM | 制造商:Texas Instruments 功能描述:16 LEAD SOIC(150MIL) :ROHS COMPLIANT |
| CD74HC4046AM96 | 功能描述:鎖相環(huán) - PLL PLL w/ VCO RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
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