ADV7180WBSTZ datasheet(25/120 Pages) AD

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Data Sheet

ADV7180

Rev. G | Page 25 of 120

VIDEO PROCESSOR

DIGITIZED CVBS

DIGITIZED Y (YC)

VIDEO DATA

OUTPUT

STANDARD DEFINITION PROCESSOR

DIGITIZED CVBS

DIGITIZED C (YC)

MACROVISION

DETECTION

VBI DATA

RECOVERY

STANDARD

AUTODETECTION

LUMA

FILTER

LUMA

DIGITAL

FINE

CLAMP

LUMA

GAIN

CONTROL

LUMA

RESAMPLE

LUMA

2D COMB

SLLC

CONTROL

CHROMA

FILTER

CHROMA

DEMOD

fSC

RECOVERY

CHROMA

DIGITAL

FINE

CLAMP

CHROMA

GAIN

CONTROL

CHROMA

RESAMPLE

CHROMA

2D COMB

SYNC

EXTRACT

LINE

LENGTH

PREDICTOR

RESAMPLE

CONTROL

CODE

INSERTION

MEASUREMENT

BLOCK (≥ I2C)

VIDEO DATA

PROCESSING

BLOCK

Figure 18. Block Diagram of the Video Processor

Figure 18 shows a block diagram of the ADV7180 video processor.

The ADV7180 can handle standard definition video in CVBS,

Y/C, and YPrPb formats. It can be divided into a luminance and

chrominance path. If the input video is of a composite type

(CVBS), both processing paths are fed with the CVBS input.

SD LUMA PATH

The input signal is processed by the following blocks:

•

Luma digital fine clamp. This block uses a high precision

algorithm to clamp the video signal.

•

Luma filter. This block contains a luma decimation filter

(YAA) with a fixed response and some shaping filters

(YSH) that have selectable responses.

•

Luma gain control. The automatic gain control (AGC) can

operate on a variety of different modes, including gain based

on the depth of the horizontal sync pulse, peak white mode,

and fixed manual gain.

•

Luma resample. To correct for line length errors as well as

dynamic line length changes, the data is digitally resampled.

•

Luma 2D comb. The 2D comb filter provides Y/C separation.

•

AV code insertion. At this point, the decoded luma (Y) signal

is merged with the retrieved chroma values. AV codes can

be inserted (as per ITU-R BT.656).

SD CHROMA PATH

The input signal is processed by the following blocks:

•

Chroma digital fine clamp. This block uses a high precision

algorithm to clamp the video signal.

•

Chroma demodulation. This block employs a color

subcarrier (fSC) recovery unit to regenerate the color

subcarrier for any modulated chroma scheme. The

demodulation block then performs an AM demodulation

for PAL and NTSC, and an FM demodulation for SECAM.

•

Chroma filter. This block contains a chroma decimation

filter (CAA) with a fixed response and some shaping filters

(CSH) that have selectable responses.

•

Chroma gain control. AGC can operate on several different

modes, including gain based on the color subcarrier

amplitude, gain based on the depth of the horizontal sync

pulse on the luma channel, or fixed manual gain.

•

Chroma resample. The chroma data is digitally resampled

to keep it perfectly aligned with the luma data. The

resampling is done to correct for static and dynamic line

length errors of the incoming video signal.

•

Chroma 2D comb. The 2D, five line, superadaptive comb

filter provides high quality Y/C separation in case the input

signal is CVBS.

•

AV code insertion. At this point, the demodulated chroma

(Cr and Cb) signal is merged with the retrieved luma values.

AV codes can be inserted (as per ITU-R BT.656).

ADV7180WBSTZ Datasheet(PDF) 25 Page - Analog Devices

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