參數(shù)資料
型號(hào)： ADV7320
廠商： Analog Devices, Inc.
英文描述： Multiformat 216 MHz Video Encoder with Six NSV 12-Bit DACs
中文描述： 多格式視頻編碼器216兆赫六噪聲整形的12位DAC
文件頁(yè)數(shù)： 48/88頁(yè)
文件大?。?/td> 1002K
代理商： ADV7320
ADV7320/ADV7321
FILTERS
Table 27 shows an overview of the programmable filters
available on the ADV7320/ADV7321.
Table 27. Selectable Filters
Filter
SD Luma LPF NTSC
SD Luma LPF PAL
SD Luma Notch NTSC
SD Luma Notch PAL
SD Luma SSAF
SD Luma CIF
SD Luma QCIF
SD Chroma 0.65 MHz
SD Chroma 1.0 MHz
SD Chroma 1.3 MHz
SD Chroma 2.0 MHz
SD Chroma 3.0 MHz
SD Chroma CIF
SD Chroma QCIF
SD UV SSAF
HD Chroma Input
HD Sinc Filter
HD Chroma SSAF
Rev. 0 | Page 48 of 88
Subaddress
0x40
0x40
0x40
0x40
0x40
0x40
0x40
0x40
0x40
0x40
0x40
0x40
0x40
0x40
0x42
0x13
0x13
0x13
SD Internal Filter Response
[Subaddress 0x40 [7:2]; Subaddress 0x42, Bit 0]
The Y filter supports several different frequency responses,
including 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
shown in Figure 35 and Figure 36.
If SD SSAF gain is enabled, there are 12 response options in the
range 4 dB to +4 dB [Subaddress 0x47, Bit 4]. Choose the
desired response by programming the correct value via the I
2
C
[Subaddress 0x62]. The variation of frequency responses are
shown in Figure 32 and Figure 33.
In addition to the chroma filters listed in Table 27, the
ADV7320/ADV7321 contains an SSAF filter specifically
designed for the color difference component outputs, U and V.
This filter has a cutoff frequency of about 2.7 MHz and a gain of
–40 dB at 3.8 MHz, as shown in Figure 66. This filter can be
controlled with Address 0x42, Bit 0.
FREQUENCY (MHz)
0
G
–10
–30
–50
–60
–20
–40
6
5
4
3
2
1
0
0
EXTENDED UV FILTER MODE
Figure 66. UV SSAF Filter
If this filter is disabled, one of the chroma filters shown in
Table 28 can be selected and used for the CVBS or luma/
chroma signal.
Table 28. Internal Filter Specifications
Pass-Band
Ripple
1
(dB)
Luma LPF NTSC
0.16
Luma LPF PAL
0.1
Luma Notch NTSC
0.09
Luma Notch PAL
0.1
Luma SSAF
0.04
Luma CIF
0.127
Luma QCIF
Monotonic
Chroma 0.65 MHz
Monotonic
Chroma 1.0 MHz
Monotonic
Chroma 1.3 MHz
0.09
Chroma 2.0 MHz
0.048
Chroma 3.0 MHz
Monotonic
Chroma CIF
Monotonic
Chroma QCIF
Monotonic
Filter
3 dB Bandwidth
2
(MHz)
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
1
Pass-band ripple is the maximum fluctuation 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, and 0 Hz to f1 (Hz) and f2 (Hz) to infinity
for a notch filter, where fc, f1, and f2 are the 3 dB points.
2
3 dB bandwidth refers to the 3 dB cutoff frequency.
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