ADV7180
Bits (Shading Indicates Default
State)
Comments
LQFP-64 LFCSP-40
Set to default
Subaddress Register
Bit Description
Notes
7
6
5
4
3
2
1
0
0x15
Digital Clamp
Reserved.
x
x
x
x
Control 1
Digital clamp freeze
(DCFE)
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
digital fine clamp
circuitry.
0
0
1
1
0
1
0
1
Reserved.
0
0x17
Shaping Filter
Control
YSFM[4:0]. Selects Y
shaping filter mode in
CVBS-only mode.
0
0
0
0
0
0
0
0
0
1
Auto wide notch for poor
quality sources or wide-
band filter with comb for
good quality input
Auto narrow notch for poor
quality sources or wideband
filter with comb for good
quality input
Decoder selects optimum
Y shaping filter depending
on CVBS quality
Allows the user to
select a wide range of
low-pass and notch
filters.
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
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 (CCIR601)
PAL NN1
PAL NN2
PAL NN3
PAL WN1
PAL WN2
NTSC NN1
NTSC NN2
NTSC NN3
NTSC WN1
NTSC WN2
NTSC WN3
Reserved
Auto selection 15.0 MHz
Auto selection 2.17 MHz
If one of these modes is
selected, the decoder does
not change filter modes;
depending on video
quality, a fixed filter
response (the one
If either auto mode is
selected, the decoder
selects the optimum Y
filter depending on the
CVBS video source
quality (good vs. bad).
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. A | Page 84 of 112
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