データシートサーチシステム
  Japanese  ▼
ALLDATASHEET.JP

X  

74VHC4046 データシート(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 74VHC4046
部品情報  CMOS Phase Lock Loop
Download  14 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

74VHC4046 データシート(HTML) 10 Page - National Semiconductor (TI)

Back Button 74VHC4046 Datasheet HTML 6Page - National Semiconductor (TI) 74VHC4046 Datasheet HTML 7Page - National Semiconductor (TI) 74VHC4046 Datasheet HTML 8Page - National Semiconductor (TI) 74VHC4046 Datasheet HTML 9Page - National Semiconductor (TI) 74VHC4046 Datasheet HTML 10Page - National Semiconductor (TI) 74VHC4046 Datasheet HTML 11Page - National Semiconductor (TI) 74VHC4046 Datasheet HTML 12Page - National Semiconductor (TI) 74VHC4046 Datasheet HTML 13Page - National Semiconductor (TI) 74VHC4046 Datasheet HTML 14Page - National Semiconductor (TI)  
Zoom Inzoom in Zoom Outzoom out
 10 / 14 page
background image
Detailed Circuit Description (Continued)
Thus in normal operation VCC and ground voltage levels are
fed to the loop filter This differs from some phase detectors
which supply a current output to the loop filter and this
should be considered in the design (The CD4046 also pro-
vides a voltage)
Figure 5 shows the state tables for all three comparators
PHASE COMPARATOR I
This comparator is a simple XOR gate similar to the
5474HC86 and its operation is similar to an overdriven
balanced modulator To maximize lock range the input fre-
quencies must have a 50% duty cycle Typical input and
output waveforms are shown in
Figure 4 The output of the
phase detector feeds the loop filter which averages the out-
put voltage The frequency range upon which the PLL will
lock onto if initially out of lock is defined as the capture
range The capture range for phase detector I is dependent
on the loop filter employed The capture range can be as
large as the lock range which is equal to the VCO frequency
range
To see how the detector operates refer to
Figure 4 When
two square wave inputs are applied to this comparator an
output waveform whose duty cycle is dependent on the
phase difference between the two signals results As the
phase difference increases the output duty cycle increases
and the voltage after the loop filter increases Thus in order
to achieve lock when the PLL input frequency increases the
VCO input voltage must increase and the phase difference
between comparator in and signal in will increase At an
input frequency equal fmin the VCO input is at 0V and this
requires the phase detector output to be ground hence the
two input signals must be in phase When the input frequen-
cy is fmax then the VCO input must be VCC and the phase
detector inputs must be 180 out of phase
The XOR is more susceptible to locking onto harmonics of
the signal input than the digital phase detector II This can
be seen by noticing that a signal 2 times the VCO frequency
results in the same output duty cycle as a signal equal the
VCO frequency The difference is that the output frequency
of the 2f example is twice that of the other example The
loop filter and the VCO range should be designed to prevent
locking on to harmonics
PHASE COMPARATOR II
This detector is a digital memory network It consists of four
flip-flops and some gating logic a three state output and a
phase pulse output as shown in
Figure 6 This comparator
acts only on the positive edges of the input signals and is
thus independent of signal duty cycle
Phase comparator II operates in such a way as to force the
PLL into lock with 0 phase difference between the VCO
output and the signal input positive waveform edges
Figure
7 shows some typical loop waveforms First assume that
the signal input phase is leading the comparator input This
Phase Comparator State Diagrams
TLF11675 – 21
FIGURE 5 PLL State Tables
10


同様の部品番号 - 74VHC4046

メーカー部品番号データシート部品情報
logo
Fairchild Semiconductor
74VHC4046 FAIRCHILD-74VHC4046 Datasheet
221Kb / 16P
   CMOS Phase Lock Loop
74VHC4046M FAIRCHILD-74VHC4046M Datasheet
221Kb / 16P
   CMOS Phase Lock Loop
74VHC4046M FAIRCHILD-74VHC4046M Datasheet
239Kb / 16P
   CMOS Phase Lock Loop
74VHC4046MTC FAIRCHILD-74VHC4046MTC Datasheet
221Kb / 16P
   CMOS Phase Lock Loop
74VHC4046MTC FAIRCHILD-74VHC4046MTC Datasheet
239Kb / 16P
   CMOS Phase Lock Loop
More results

同様の説明 - 74VHC4046

メーカー部品番号データシート部品情報
logo
Fairchild Semiconductor
MM74HC4046 FAIRCHILD-MM74HC4046 Datasheet
250Kb / 17P
   CMOS Phase Lock Loop
74VHC4046 FAIRCHILD-74VHC4046 Datasheet
221Kb / 16P
   CMOS Phase Lock Loop
74VHC4046 FAIRCHILD-74VHC4046_03 Datasheet
239Kb / 16P
   CMOS Phase Lock Loop
logo
List of Unclassifed Man...
NE565 ETC1-NE565 Datasheet
348Kb / 6P
   Phase-Lock Loop
logo
Toshiba Semiconductor
T4K71 TOSHIBA-T4K71 Datasheet
189Kb / 2P
   Built-in phase lock loop
logo
Texas Instruments
CD4046BEE4 TI1-CD4046BEE4 Datasheet
927Kb / 16P
[Old version datasheet]   CMOS Micropower Phase-Lockedn Loop
logo
Intersil Corporation
CD4046BMS INTERSIL-CD4046BMS Datasheet
109Kb / 11P
   CMOS Micropower Phase Locked Loop
December 1992
logo
Texas Instruments
CD4046B TI1-CD4046B_15 Datasheet
941Kb / 16P
[Old version datasheet]   CMOS Micropower Phase-Locked Loop
CD4046B TI-CD4046B Datasheet
322Kb / 12P
[Old version datasheet]   CMOS MICROPOWER PHASE-LOCKED LOOP
logo
NXP Semiconductors
74HC7046A PHILIPS-74HC7046A Datasheet
490Kb / 38P
   Phase-locked-loop with lock detector
December 1990
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14


データシート ダウンロード

Go To PDF Page


リンク URL




プライバシーポリシー
ALLDATASHEET.JP
ALLDATASHEETはお客様のビジネスに役立ちますか?  [ DONATE ] 

Alldatasheetは   |   広告   |   お問い合わせ   |   プライバシーポリシー   |   リンク交換   |   メーカーリスト
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com