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| 型號： | ADV7330 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Multiformat 11-Bit Triple DAC Video Encoder |
| 中文描述： | 多格式11位DAC的視頻編碼器三 |
| 文件頁數(shù)： | 35/76頁 |
| 文件大小： | 1378K |
| 代理商： | ADV7330 |
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REV. B
ADV7330
–35–
Table VI. Internal Filter Specifications
Pass-Band Ripple 3 dB Bandwidth
(dB)
1
Filter
(MHz)
2
Luma LPF NTSC
Luma LPF PAL
Luma Notch NTSC
Luma Notch PAL
Luma SSAF
Luma CIF
Luma QCIF
Chroma 0.65 MHz
Chroma 1.0 MHz
Chroma 1.3 MHz
Chroma 2.0 MHz
Chroma 3.0 MHz
Chroma CIF
Chroma QCIF
0.16
0.1
0.09
0.1
0.04
0.127
Monotonic
Monotonic
Monotonic
0.09
0.048
Monotonic
Monotonic
Monotonic
4.24
4.81
2.3/4.9/6.6
3.1/5.6/6.4
6.45
3.02
1.5
0.65
1
1.395
2.2
3.2
0.65
0.5
NOTES
1
Pass-band ripple refers to the maximum fluctuations from the 0 dB response in
the pass band, measured in (dB). The pass band is defined to have 0 (Hz) to
fc (Hz) frequency limits for a low-pass filter, 0 (Hz) to f1 (Hz) and f2 (Hz) to
infinity for a notch filter, where fc, f1, f2 are the –3 dB points.
2
3 dB bandwidth refers to the –3 dB cutoff frequency.
FREQUENCY (MHz)
0
G
–10
–30
–50
–60
–20
–40
6
5
4
3
2
1
0
EXTENDED UV FILTER MODE
Figure 29. UV SSAF Filter
SD Internal Filter Response
[Subaddress 40h; Subaddress 42, Bit 0]
The Y filter supports several different frequency responses includ-
ing two low-pass responses, two notch responses, an extended
(SSAF) response with or without gain boost/attenuation, a CIF
response, and a QCIF response. The UV filter supports several
different frequency responses including six low-pass responses,
a CIF response, and a QCIF response, as can be seen in the
typical performance characteristics graphs on the following pages.
If SD SSAF gain is enabled, there is the option of 12 responses in
the range of –4 dB to +4 dB [Subaddress 47, Bit 4]. The desired
response can be chosen by the user by programming the correct
value via the I
C [Subaddress 62h]. The variation of frequency
responses can be seen in the typical performance characteristics
graphs on the following pages.
In addition to the chroma filters listed in Table VI, the ADV7330
contains an SSAF filter specifically designed for and applicable
to the color difference component outputs, U and V.
This filter has a cutoff frequency of about 2.7 MHz and –40 dB
at 3.8 MHz, as can be seen in Figure 29. This filter can be
controlled with Address 42h, Bit 0.
If this filter is disabled, the selectable chroma filters shown in
Table VI can be used for the CVBS or chroma signal.
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