Analog Devices ADV7181BCP Manual page 76

ADV7181B
Subaddress Register
Analog
0x14
Clamp
Control
0x15 Digital
Clamp
Control 1
0x17 Shaping
Filter
Control
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Bit Description
Reserved.
CCLEN. Current clamp enable allows
the user to switch off the current
sources in the analog front.
Reserved.
Reserved.
DCT[1:0]. Digital clamp timing
determines the time constant of the
digital fine clamp circuitry.
Reserved.
YSFM[4:0]. Selects Y Shaping Filter
mode when in CVBS only mode.
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. bad).
CSFM[2:0].
C shaping filter mode allows the
selection from a range of low-pass
chrominance filters, SH1 to SH5 and
wideband mode.
Bits
7 6 5 4 3 2 1 0
0 0 1 0
0
1
0 0 0
0 x x x x
0 0
0 1
1 0
1 1
0
0 0 0 0 0
0 0 0 0 1
0 0 0 1 0
0 0 0 1 1
0 0 1 0 0
0 0 1 0 1
0 0 1 1 0
0 0 1 1 1
0 1 0 0 0
0 1 0 0 1
0 1 0 1 0
0 1 0 1 1
0 1 1 0 0
0 1 1 0 1
0 1 1 1 0
0 1 1 1 1
1 0 0 0 0
1 0 0 0 1
1 0 0 1 0
1 0 0 1 1
1 0 1 0 0
1 0 1 0 1
1 0 1 1 0
1 0 1 1 1
1 1 0 0 0
1 1 0 0 1
1 1 0 1 0
1 1 0 1 1
1 1 1 0 0
1 1 1 0 1
1 1 1 1 0
1 1 1 1 1
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
Rev. B | Page 76 of 100
Comments Notes
Set to default
Current sources switched
off
Current sources enabled
Set to default
Set to default
Slow (TC = 1 sec)
Medium (TC = 0.5 sec)
Fast (TC = 0.1 sec)
TC dependent on video
Set to default
Auto wide notch for poor Decoder selects
quality sources or wide- optimum Y shaping
band filter with comb for filter depending on
good quality input CVBS quality.
Auto narrow notch for
poor quality sources or
wideband filter with comb
for good quality input
SVHS 1 If one of these
modes is selected,
SVHS 2
the decoder does
SVHS 3
not change filter
SVHS 4
modes. Depending
SVHS 5
on video quality, a
SVHS 6
fixed filter response
(the one selected) is
SVHS 7
used for good and
SVHS 8
bad quality video.
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 WN 1
PAL WN 2
NTSC NN1
NTSC NN2
NTSC NN3
NTSC WN1
NTSC WN2
NTSC WN3
Reserved
Auto selection 15 MHz Automatically
selects a C filter for
Auto selection 2.17 MHz
the specified 3 dB
cutoff.
SH1
SH2
SH3
SH4
SH5
Wideband mode