ADV7180WBSTZ datasheet(34/120 Pages) AD

34 / 120 page

ADV7180

Data Sheet

Rev. G | Page 34 of 120

CHROMA FILTER

Data from the digital fine clamp block is processed by the three

sets of filters that follow. Note that the data format at this point is

CVBS for CVBS inputs, chroma only for Y/C, or U/V interleaved

for YPrPb input formats.

•

Chroma antialias filter (CAA). The ADV7180 oversamples the

CVBS by a factor of 4 and the chroma/YPrPb by a factor of 2.

A decimating filter (CAA) is used to preserve the active video

band and to remove any out-of-band components. The

CAA filter has a fixed response.

•

Chroma shaping filters (CSH). The shaping filter block

(CSH) can be programmed to perform a variety of low-pass

responses. It can be used to selectively reduce the bandwidth

of the chroma signal for scaling or compression.

•

Digital resampling filter. This block allows dynamic

resampling of the video signal to alter parameters such as

the time base of a line of video. Fundamentally, the resampler

is a set of low-pass filters. The actual response is chosen by

the system without user intervention.

Figure 26 shows the overall response of all filters together.

–20

–40

–60

–80

–100

–120

FREQUENCY (MHz)

COMBINED Y ANTIALIAS, CCIR MODE SHAPING FILTER,

Y RESAMPLE

Figure 23. Combined Y Antialias, CCIR Mode Shaping Filter

–10

–20

–30

–40

–50

–60

–70

FREQUENCY (MHz)

COMBINED Y ANTIALIAS, PAL NOTCH FILTERS,

Y RESAMPLE

Figure 24. Combined Y Antialias, PAL Notch Filters

–10

–20

–30

–40

–50

–60

–70

FREQUENCY (MHz)

COMBINED Y ANTIALIAS, NTSC NOTCH FILTERS,

Y RESAMPLE

Figure 25. Combined Y Antialias Filter, NTSC Notch Filters

–10

–20

–30

–40

–50

–60

FREQUENCY (MHz)

COMBINED C ANTIALIAS, C SHAPING FILTER,

C RESAMPLER

Figure 26. Chroma Shaping Filter Responses

ADV7180WBSTZ Datasheet(PDF) 34 Page - Analog Devices

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