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參數(shù)資料
| 型號： | SAF7115HW |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 通用總線功能 |
| 英文描述： | Multistandard video decoder with super-adaptive comb filter, scaler and VBI data read-back via I2C-bus |
| 文件頁數(shù)： | 20/35頁 |
| 文件大?。?/td> | 217K |
| 代理商： | SAF7115HW |
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SAF7115_1
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 October 2008
20 of 35
NXP Semiconductors
SAF7115
Multistandard video decoder
10. Application information
10.1 Oscillator applications
10.1.1
Generic oscillator applications
Figure 5
shows the generic oscillator circuit with quartz crystals and with direct clock
input.
Table 9
shows configuration examples for different quartz crystals.
[1]
See
Table 8
.
[2]
See
Section 10.1.2
.
10.1.2
Fundamental quartz crystals with restricted drive level
Leave out L and C
1
when using fundamental quartz crystal and restricted drive level (see
Section 10.1.1
). Use a series resistance R
s
at pin XTALO, when the internal oscillator of
the SAF7115 provides too much power P
drive
to the selected quartz crystal. Note that the
decreased crystal amplitude results in a lower drive level, but on the other hand the jitter
performance will decrease.
10.2 PCB layout guidelines for oscillator applications
Place the quartz crystal on the PCB as close to pins XTALI and XTALO as possible to
minimize susceptibility to noise from current loops. Minimize parasitic capacitances.
a. Generic oscillator circuit
b. With direct clock.
Fig 5.
Oscillator applications (see
Table 9
)
C2
C3
Rs
C1
L
D1 (7)
XTALI
XTALO
C1 (6)
fxtal(nom)
SAF7115
001aah884
001aah706
D1 (7)
XTALI
XTALO
n.c.
clock
32.11 MHz or
24.576 MHz
C1 (6)
SAF7115
Table 9.
Example
Configuration examples quartz crystal (see
Figure 5
)
Quartz crystal
[1]
Type
f
xtal(nom)
(MHz) C
L
(pF)
3rd harmonic
32.11
3rd harmonic
24.576
fundamental
32.11
fundamental
32.11
fundamental
24.576
Oscillator circuit
L (
μ
H)
4.7
4.7
none
none
none
C
1
(nF)
1
1
none
none
none
C
2
(pF)
15
18
33
10
15
C
3
(pF)
15
18
33
10
15
R
s
(
)
[2]
0
0
0
0
0
1
2
3
4
5
8
8
20
8
8
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| SAF71-1808-05 | 制造商:FW Bell 功能描述:STANDARD AXIAL PROBE |
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