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参数资料
型号： ADV7180KST48Z
厂商： Analog Devices Inc
文件页数： 32/116页
文件大小： 0K
描述： IC VID DECOD SDTV 10BIT 48LQFP
标准包装： 1
类型： 视频解码器
应用： 数码相机，手机，便携式视频
安装类型： 表面贴装
封装/外壳： 48-LQFP
供应商设备封装： 48-LQFP（7x7）
包装： 托盘
ADV7180
Data Sheet
Rev. I | Page 22 of 116
ANTIALIASING FILTERS
The ADV7180 has optional on-chip antialiasing (AA) filters on
each of the three channels that are multiplexed to the ADC (see
Figure 17). The filters are designed for standard definition video
up to 10 MHz bandwidth. Figure 18 and Figure 19 show the
filter magnitude and phase characteristics.
The antialiasing filters are enabled by default and the selection
of INSEL[3:0] determines which filters are powered up at any
given time. For example, if CVBS mode is selected, the filter
circuits for the remaining input channels are powered down to
conserve power. However, the antialiasing filters can be disabled
or bypassed using the AA_FILT_MAN_OVR control.
AIN1
AIN2
AIN3
AIN41
AIN51
AIN61
AA
FILTER 1
AA
FILTER 2
AA
FILTER 3
10-BIT, 86MHz
ADC
MU
X
B
L
O
C
K
SHA
A/D
05
70
0-
0
12
1ONLY AVAILABLE IN 64-LEAD AND 48-LEAD PACKAGES.
Figure 17. Antialias Filter Configuration
AA_FILT_MAN_OVR, Antialiasing Filter Override,
Address 0xF3[3]
This feature allows the user to override the antialiasing filters
on/off settings, which are automatically selected by INSEL[3:0].
AA_FILT_EN, Antialiasing Filter Enable, Address 0xF3[2:0]
These bits allow the user to enable or disable the antialiasing
filters on each of the three input channels multiplexed to the
ADC. When disabled, the analog signal bypasses the AA filter
and is routed directly to the ADC.
AA_FILT_EN, Address 0xF3[0]
When AA_FILT_EN[0] is 0, AA Filter 1 is bypassed.
When AA_FILT_EN[0] is 1, AA Filter 1 is enabled.
AA_FILT_EN, Address 0xF3[1]
When AA_FILT_EN[1] is 0, AA Filter 2 is bypassed.
When AA_FILT_EN[1] is 1, AA Filter 2 is enabled.
AA_FILT_EN, Address 0xF3[2]
When AA_FILT_EN[2] is 0, AA Filter 3 is bypassed.
When AA_FILT_EN[2] is 1, AA Filter 3 is enabled.
0
–36
1k
100M
0
570
0-
0
13
FREQUENCY (Hz)
M
AG
NI
T
UD
E
(
d
B)
10k
100k
1M
10M
–4
–8
–12
–16
–20
–24
–28
–32
Figure 18. Antialiasing Filter Magnitude Response
0
–150
1k
100M
0
570
0-
0
14
FREQUENCY (Hz)
10k
100k
1M
10M
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
P
HAS
E
(
D
eg
rees)
Figure 19. Antialiasing Filter Phase Response
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