ADV7180WBSTZ datasheet(41/120 Pages) AD

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Data Sheet

ADV7180

Rev. G | Page 41 of 120

COMB FILTERS

The comb filters of the ADV7180 have been greatly improved to

automatically handle video of all types, standards, and levels of

quality. The NTSC and PAL configuration registers allow the

user to customize the comb filter operation depending on which

video standard is detected (by autodetection) or selected (by

manual programming). In addition to the bits listed in this

section, there are some other internal controls (based on

Analog Devices proprietary algorithms); contact local Analog

Devices field engineers for more information.

NTSC Comb Filter Settings

These settings are used for NTSC M/J CVBS inputs.

NSFSEL[1:0], Split Filter Selection NTSC, Address 0x19[3:2]

The NSFSEL[1:0] control selects how much of the overall signal

bandwidth is fed to the combs. A narrow split filter selection

results in better performance on diagonal lines but more dot

crawl in the final output image. The opposite is true for selecting

a wide bandwidth split filter.

Table 53. NSFSEL Function

NSFSEL[1:0]

Description

00 (default)

Narrow

Medium

Wide

CTAPSN[1:0], Chroma Comb Taps, NTSC, Address 0x38[7:6]

Table 54. CTAPSN Function

CTAPSN[1:0]

Description

Do not use

NTSC chroma comb adapts three lines (three taps) to two lines (two taps)

10 (default)

NTSC chroma comb adapts five lines (five taps) to three lines (three taps)

NTSC chroma comb adapts five lines (five taps) to four lines (four taps)

CCMN[2:0], Chroma Comb Mode, NTSC, Address 0x38[5:3]

Table 55. CCMN Function

CCMN[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

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