Data Sheet
ADV7180
Bits
(Shading Indicates Default State)
Subaddress
Register
Bit Description
7
6
5
4
3
2
1
0
Comments
Notes
0x14
Analog
clamp control
Reserved
0
0
1
0
Set to default
CCLEN; current clamp
enable allows the user
to switch off the current
sources in the analog
front
0
1
Current sources switched off
Current sources enabled
Reserved
Reserved
0
0
0
Set to default
0x15
Digital Clamp
Control 1
x
x
x
x
Set to default
DCFE; digital clamp
freeze enable
0
1
Digital clamp on
Digital clamp off
Slow (TC = 1 sec)
Medium (TC = 0.5 sec)
Fast (TC = 0.1 sec)
TC dependent on video
Set to default
DCT[1:0]; digital clamp
timing determines the
time constant of the
0
0
1
1
0
1
0
1
digital fine clamp circuitry
Reserved
0
0x17
Shaping Filter
Control 1
YSFM[4:0]; selects Y
shaping filter mode in
CVBS-only mode;
0
0
0
0
0
0
0
0
0
1
Autowide notch for poor quality
sources or wideband filter with
comb for good quality input
Autonarrow notch for poor quality
sources or wideband filter with
comb for good quality input
SVHS 1
SVHS 2
SVHS 3
SVHS 4
SVHS 5
SVHS 6
SVHS 7
SVHS 8
SVHS 9
SVHS 10
SVHS 11
SVHS 12
SVHS 13
SVHS 14
SVHS 15
SVHS 16
SVHS 17
SVHS 18 (CCIR 601)
PAL NN1
PAL NN2
PAL NN3
PAL WN1
PAL WN2
NTSC NN1
NTSC NN2
NTSC NN3
NTSC WN1
NTSC WN2
NTSC WN3
Reserved
Autoselection 1.5 MHz
Autoselection 2.17 MHz
Decoder selects
optimum Y
shaping filter
depending on
CVBS quality
allows the user to select
a wide range of low-pass
and notch filters; if either
auto mode is selected,
the decoder selects
the optimum Y filter
depending on the CVBS
video source quality
(good vs. poor)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
If one of these
modes is selected,
the decoder does
not change filter
modes; depending
on video quality, a
fixed filter response
(the one selected)
is used for good
and bad quality
video
CSFM[2:0]; C shaping filter
mode allows selection
from a range of low-pass
chrominance filters;
if either auto mode is
selected, the decoder
selects the optimum C
filter depending on the
CVBS video source quality
(good vs. bad); nonauto
settings force a C filter for
all standards and quality
of CVBS video
0
0
0
0
0
1
Automatically
selects a C filter
based on video
standard and
quality
Selects a C filter for
all video standards
and for good and
bad video
0
0
1
1
1
1
1
1
0
0
1
1
0
1
0
1
0
1
SH1
SH2
SH3
SH4
SH5
Wideband mode
Rev. G | Page 87 of 120
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