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參數(shù)資料
| 型號： | VPC3200A |
| 廠商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 元件分類： | 消費家電 |
| 英文描述： | Comb Filter Video Processor |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封裝： | PLASTIC, QFP-80 |
| 文件頁數(shù)： | 60/78頁 |
| 文件大?。?/td> | 1245K |
| 代理商： | VPC3200A |
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VPC 323xD, VPC 324xD
ADVANCE INFORMATION
60
Micronas
4.6.3. Recommended Crystal Characteristics
Symbol
Parameter
Min.
Typ.
Max.
Unit
T
A
Operating Ambient Temperature
0
–
65
°
C
f
P
Parallel Resonance Frequency
with Load Capacitance
C
L
= 13 pF
–
20.250000
–
MHz
f
P
/f
P
Accuracy of Adjustment
–
–
±
20
ppm
f
P
/f
P
Frequency Temperature Drift
–
–
±
30
ppm
R
R
Series Resistance
–
–
25
C
0
Shunt Capacitance
3
–
7
pF
C
1
Motional Capacitance
20
–
30
fF
Load Capacitance Recommendation
C
Lext
External Load Capacitance
1)
from
pins to Ground
(pin names: Xtal1 Xtal2)
–
3.3
–
pF
DCO Characteristics
2,3)
C
ICLoadmin
Effective Load Capacitance @ min.
DCO–Position, Code 0,
package: 68PLCC
3
4.3
5.5
pF
C
ICLoadrng
Effective Load Capacitance Range,
DCO Codes from 0..255
11
12.7
15
pF
1)
Remarks on defining the External Load Capacitance:
External capacitors at each crystal pin to ground are required. They are necessary to tune the effective load capacitance of the
PCBs to the required load capacitance C
L
of the crystal. The higher the capacitors, the lower the clock frequency results. The
nominal free running frequency should match f
p
MHz. Due to different layouts of customer PCBs the matching capacitor size
should be determined in the application. The suggested value is a figure based on experience with various PCB layouts.
Tuning condition: Code DVCO Register=–720
2)
Remarks on Pulling Range of DCO:
The pulling range of the DCO is a function of the used crystal and effective load capacitance of the IC (C
ICLoad
+C
LoadBoard
).
The resulting frequency f
L
with an effective load capacitance of C
Leff
= C
ICLoad
+ C
LoadBoard
is:
1 + 0.5 * [ C
1
/ (C
0
+ C
L
) ]
f
L
= f
P
* _______________________
1 + 0.5 * [ C
1
/ (C
0
+ C
Leff
) ]
3)
Remarks on DCO codes
The DCO hardware register has 8 bits, the fp control register uses a range of –2048...2047
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