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參數(shù)資料
| 型號： | MC44302AP |
| 廠商： | MOTOROLA INC |
| 元件分類： | 消費家電 |
| 英文描述： | ADVANCED MULTI-STANDARD VIDEO/SOUND IF |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP28 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁數(shù)： | 16/28頁 |
| 文件大小： | 612K |
| 代理商： | MC44302AP |
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MC44302A
16
MOTOROLA ANALOG IC DEVICE DATA
Figure 25. Acquisition Circuit Timing
PLL Lock
4.2 V
3.2 V
2.0 V
4.3 V
3.7 V
3.0 V
2.7 V
1.3 V
0.8 V
4.5 V
2.5 V
0.5 V
PLL Filters
(Main VCO Loop)
Pin 19
Lock Detector/Filter
(Acquisition Circuit)
Pin 18
AFT Output
Pin 11
Signal
No
Signal
Signal
Signal
Detection
Completed
VCO Offset
Application
Start
Start
Completed
VCO Offset
Removal
VCO Sweep
Inhibited
Phase
Detector
Inhibited
Phase
Detector
Active
Phase
Detector
Active
Pin 12 = Gnd
Pin 12 = Open
Pin 12 = VCC
Final Static
Condition
AFT Correcting
AFT Clamped
AFT
Static
AFT Static
VCO Sweep
Initiated
fIF High
fIF Nominal
In order to make the above drawing easier to comprehend, the vertical voltage axis was drawn to scale but the horizontal time axis was not. The typical slewing
time for each output with the component values shown in the application circuit is as follows:
PLL Filter (Main VCO Loop) Pin 19 – 3.5 ms total sweep time when discharging down from 4.2 V to 2.0 V and charging back up to 4.2 V.
Lock Detector/Filter (Acquisition Circuit) Pin 18 – 4.0 ms when slewing up from 0.8 V to 4.3 V.
AFT Output Pin 11 – 12 ms when slewing from 4.5 V or 0.5 V to the final static condition of 2.5 V.
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