ADV7182ABCPZ datasheet(39/102 Pages) AD

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Data Sheet

ADV7182A

Rev. 0 | Page 39 of 102

CCMP[2:0], Chroma Comb Mode, PAL—Address 0x39,

Bits[5:3]

Table 61. CCMP Function

CCMP[2:0]

Description

Configuration

000 (default)

Adaptive comb mode

Adaptive three-line

chroma comb for

CTAPSN = 01

Adaptive four-line

chroma comb for

CTAPSN = 10

Adaptive five-line

chroma comb for

CTAPSN = 11

100

Disable chroma comb

101

Fixed chroma comb

(top lines of line

memory)

Fixed two-line chroma

comb for CTAPSN = 01

Fixed three-line chroma

comb for CTAPSN = 10

Fixed four-line chroma

comb for CTAPSN = 11

110

Fixed chroma comb (all

lines of line memory)

Fixed three-line chroma

comb for CTAPSN = 01

Fixed four-line chroma

comb for CTAPSN = 10

Fixed five-line chroma

comb for CTAPSN = 11

111

Fixed chroma comb

(bottom lines of line

memory)

Fixed two-line chroma

comb for CTAPSN = 01

Fixed three-line chroma

comb for CTAPSN = 10

Fixed four-line chroma

comb for CTAPSN = 11

YCMP[2:0], Luma Comb Mode, PAL—Address 0x39,

Bits[2:0]

Table 62. YCMP Function

YCMP[2:0]

Description

Configuration

000 (default)

Adaptive comb mode

Adaptive five lines (three

taps) luma comb

100

Disable luma comb

Use low-pass/notch filter;

see the Y Shaping Filter

section

101

Fixed luma comb (top

lines of line memory)

Fixed three lines (two

taps) luma comb

110

Fixed luma comb (all

lines of line memory)

Fixed five lines (three taps)

luma comb

111

Fixed luma comb

(bottom lines of line

memory)

Fixed three lines (two

taps) luma comb

IF FILTER COMPENSATION

IFFILTSEL[2:0], IF Filter Select—Address 0xF8, Bits[2:0]

The IFFILTSEL[2:0] register allows the user to compensate for

SAW filter characteristics on a composite input, as observed on

tuner outputs. Figure 29 and Figure 30 show IF filter

compensation for NTSC and PAL, respectively.

The options for this feature are as follows:



Bypass mode.



NTSC, consisting of three filter characteristics.



PAL, consisting of three filter characteristics.

See Table 96 for programming details.

Figure 29. NTSC IF Filter Compensation

Figure 30. PAL IF Filter Compensation

–12

2.0

5.0

FREQUENCY (MHz)

IF COMP FILTERS NTSC ZOOMED AROUND

fSC

–2

–4

–6

–8

–10

2.5

3.0

3.5

4.0

4.5

–8

3.0

6.0

FREQUENCY (MHz)

IF COMP FILTERS PAL ZOOMED AROUND

fSC

–2

–4

–6

3.5

4.0

4.5

5.0

5.5

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