ADV7842 datasheet(21/28 Pages) AD

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ADV7842

Rev. B | Page 21 of 28

STANDARD DEFINITION PROCESSOR

The SDP is capable of decoding a large selection of baseband

video signals in composite and S-Video formats. The video

standards supported by the SDP include PAL, PAL 60, PAL M,

PAL N, PAL NC, NTSC M/J, NTSC 4.43, and SECAM. The

ADV7842 can automatically detect the video standard and

process it accordingly.

The SDP has a 3D temporal comb filter and a five-line adaptive

2D comb filter that gives superior chrominance and luminance

separation when decoding a composite video signal. This highly

adaptive filter automatically adjusts its processing mode according

to the video standard and signal quality with no user intervention

required. The SDP has an IF filter block that compensates for

attenuation in the high frequency chroma spectrum due to a tuner

SAW filter. The SDP has specific luminance and chrominance

parameter controls for brightness, contrast, saturation, and hue.

The ADV7842 implements a patented Adaptive Digital Line

Length Tracking (ADLLT™) algorithm to track varying video

line lengths from sources such as a VCR. ADLLT enables the

ADV7842 to track and decode poor quality video sources (such

as VCRs) and noisy sources (such as tuner outputs, VCR

players, and camcorders). Frame TBC ensures stable clock

synchronization between the decoder and the downstream

devices.

The SDP also contains both a luma transient improvement (LTI)

block and a chroma transient improvement (CTI) block. These

increase the edge rate on the luma and chroma transitions,

resulting in a sharper video image. The SDP has a Macrovision®

detection circuit that allows Type I, Type II, and Type III

Macrovision protection levels. The decoder is also fully robust

to all Macrovision signal inputs.

SDP features include:



Advanced adaptive 3D comb (using either external DDR or

SDR SDRAM memory)



Adaptive 2D five-line comb filters for NTSC and PAL that

give superior chrominance and luminance separation for

composite video



Full automatic detection and autoswitching of all

worldwide standards (PAL, NTSC, and SECAM)



Automatic gain control with white peak mode that ensures

the video is always processed without loss of the video

processing range



Proprietary architecture for locking to weak, noisy, and

unstable sources from VCRs and tuners



IF filter block that compensates for high frequency luma

attenuation due to tuner SAW filter



LTI and CTI



Vertical and horizontal programmable luma peaking filters



8× oversampling (108 MHz) for CVBS, and S-Video modes



Line-locked clock (LLC) output



Free run output mode that provides stable timing when no

video input is present or video lock is lost



Internal color bar test pattern



Advanced TBC with frame synchronization, which ensures

nominal clock and data for nonstandard input



Interlace-to-progressive conversion for 525i and 625i

formats, enabling direct drive of HDMI Tx devices



Color controls that include hue, brightness, saturation, and

contrast

COMPONENT PROCESSOR

The CP section of the ADV7842 is capable of decoding and

digitizing a wide range of component video formats in any color

space. Component video standards supported by the CP are

525i, 625i, 525p, 625p, 720p, 1080i, 1080p, 1250i, VGA up to

UXGA at 60 Hz, and other standards.

The any-to-any, 3 × 3 CSC matrix is placed between the analog

front end and the CP section. This enables YPbPr to RGB and

RGB to YCbCr conversions. Many other standards of color

space can be implemented using the color space converter.

The CP section contains circuitry to enable the detection of

Macrovision encoded YPbPr signals for 525i, 625i, 525p, and

625p. It is designed to be fully robust when decoding these

types of signals. VBI extraction of CGMS data is performed by the

CP section of the ADV7842 for interlaced, progressive, and high

definition scanning rates. The data extracted can be read back over

the I2C interface.

CP features include:



525i, 625i, 525p, 625p, 720p, 1080i, 1080p, and many other

HDTV formats are supported



Supports 720p 24 Hz/25 Hz formats



Manual adjustments, including gain (contrast),

offset (brightness), hue, and saturation



Support for analog component YPbPr and RGB video

formats with embedded synchronization, composite

synchronization or separate HS and VS



Any-to-any, 3 × 3 CSC matrix that supports YCbCr-to-

RGB and RGB-to-YCbCr, fully programmable or

preprogrammable configurations



Synchronization source polarity detector (SSPD) that

determines the source and polarity of the synchronization

signals that accompany the input video



Macrovision copy protection detection on component

formats (525i, 625i, 525p, and 625p)



Free-run output mode that provides stable timing when no

video input is present or video lock is lost



Arbitrary pixel sampling support for nonstandard video

sources



170 MHz conversion rate, which supports RGB input

resolutions up to 1600 × 1200 at 60 Hz



Standard identification enabled by STDI block



RGB that can be color space converted to YCbCr and

decimated to a 4:2:2 format for video-centric back-end IC

interfacing

ADV7842 Datasheet(PDF) 21 Page - Analog Devices

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