Data Sheet
ADV7180
Bits
(Shading Indicates Default State)
Subaddress
Register
Bit Description
7
6
5
4
3
2
1
0
0
0
0
1
Comments
Notes
0x27
Pixel delay
control
LTA[1:0]; luma timing
adjust allows the user to
specify a timing difference
between chroma and
luma samples
No delay
CVBS mode
LTA[1:0] = 00b,
S-Video mode
LTA[1:0] = 01b,
YPrPb mode
LTA[1:0] = 01b
Luma one clock (37 ns) late
1
1
0
1
Luma two clocks (74 ns) early
Luma one clock (37 ns) early
Reserved
0
Set to 0
CTA[2:0]; chroma
timing adjust allows
a specified timing
difference between
the luma and chroma
samples
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Not a valid setting
CVBS mode
CTA[2:0] = 011b,
S-Video mode
CTA[2:0] =101b,
YPrPb mode
Chroma + two pixels (early)
Chroma + one pixel (early)
No delay
CTA[2:0] = 110b
Chroma − one pixel (late)
Chroma − two pixels (late)
Chroma − three pixels (late)
Not a valid setting
AUTO_PDC_EN;
0
1
Use values in LTA[1:0] and CTA[2:0]
for delaying luma/chroma
automatically programs
the LTA/CTA values so
that luma and chroma are
aligned at the output for
all modes of operation
LTA and CTA values determined
automatically
SWPC; allows the Cr and
Cb samples to be swapped
0
1
No swapping
Swap the Cr and Cb output samples
Update once per video line
Update once per field
0x2B
Misc gain
control
PW_UPD; peak white
update determines the
rate of gain
0
1
Peak white must
be enabled; see
LAGC[2:0]
Reserved
1
0
0
0
0
Set to default
CKE; color kill enable
allows the color kill
function to be switched
on and off
0
1
Color kill disabled
Color kill enabled
For SECAM color
kill, the threshold is
set at 8%; see
CKILLTHR[2:0]
Reserved
1
Set to default
0x2C
AGC mode
control
CAGC[1:0]; chroma auto-
matic gain control selects
the basic mode of
operation for the AGC in
the chroma path
0
0
1
1
0
1
0
1
Manual fixed gain
Use luma gain for chroma
Automatic gain
Use CMG[11:0]
Based on color burst
Freeze chroma gain
Set to 1
Reserved
1
1
LAGC[2:0]; luma auto
matic gain control selects
the mode of operation for
the gain control in the
luma path
0
0
0
0
0
1
Manual fixed gain
Peak white algorithm off
Use LMG[11:0]
Blank level to
sync tip
0
1
0
Peak white algorithm on
Blank level to
sync tip
0
1
1
1
1
1
0
0
1
1
1
0
1
0
1
Reserved
Reserved
Reserved
Reserved
Freeze gain
Set to 1
Reserved
1
0x2D
Chroma Gain
Control 1,
Chroma Gain1
(CG)
CMG[11:8]/CG[11:8]; in
0
1
0
0
CAGC[1:0] settings
decide in which
mode CMG[11:0]
operates
manual mode, the chroma
gain control can be used to
program a desired manual
chroma gain; in auto mode,
it can be used to read back
the current gain value
Reserved
1
1
Set to 1
CAGT[1:0]; chroma auto
matic gain timing allows
adjustment of the chroma
AGC tracking speed
0
0
1
1
0
1
0
1
Slow (TC = 2 sec)
Medium (TC = 1 sec)
Reserved
Has an effect only
if CAGC[1:0] is set
to autogain (10)
Adaptive
Rev. G | Page 89 of 120
ADI [ ADI ]
