參數(shù)資料
型號(hào)： ADV7314KST
廠商： ANALOG DEVICES INC
元件分類： 顏色信號(hào)轉(zhuǎn)換
英文描述： Multiformat 216 MHz Video Encoder with Six NSV 14-Bit DACs
中文描述： COLOR SIGNAL ENCODER, PQFP64
封裝： LEAD FREE, MS-026BCD, LQFP-64
文件頁(yè)數(shù)： 41/84頁(yè)
文件大?。?/td> 1069K
代理商： ADV7314KST
REV. 0
ADV7314
–41–
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.
If SD SSAF gain is enabled, there are 12 possible responses in
the range from –4 dB to +4 dB [Subaddress 47h, Bit 4]. The
desired response can be chosen by the user by programming the
correct value via the I
2
C [Subaddress 62h]. The variation of
frequency responses can be seen in the Typical Performance
Characteristics graphs.
Table VII. Internal Filter Specifications
Pass-Band Ripple 3 dB Bandwidth
(dB)
Filter
(MHz)
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
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.
In addition to the chroma filters listed in Table VII, the ADV7314
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 37. This filter can be
controlled with Address 42h, Bit 0.
If this filter is disabled, the selectable chroma filters shown in
Table VII can be used for the CVBS or Luma/Chroma signal.
FREQUENCY (MHz)
0
G
–10
–30
–50
–60
–20
–40
6
5
4
3
2
1
0
EXTENDED UV FILTER MODE
Figure 37. UV SSAF Filter
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