ADV7188BSTZ View Datasheet(PDF) - Analog Devices

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ADV7188BSTZ

Multiformat SDTV Video Decoder with Fast Switch Overlay Support

Analog Devices 

ADV7188

INTRODUCTION

The ADV7188 is a high quality, single chip, multiformat video

decoder that automatically detects and converts PAL, NTSC,

and SECAM standards in the form of composite, S-video, and

component video into a digital ITU-R BT.656 format.

The advanced, highly flexible digital output interface enables

performance video decoding and conversion in line-locked, clock-

based systems. This makes the device ideally suited for a broad

range of applications with diverse analog video characteristics,

including tape-based sources, broadcast sources, security and

surveillance cameras, and professional systems.

ANALOG FRONT END

The ADV7188 analog front end includes four 12-bit NSV ADCs

that digitize the analog video signal before applying it to the

standard definition processor (SDP). The analog front end uses

differential channels for each ADC to ensure high performance

in mixed-signal applications.

The front end also includes a 12-channel input mux that enables

multiple video signals to be applied to the ADV7188. Current and

voltage clamps are positioned in front of each ADC to ensure

that the video signal remains within the range of the converter.

Fine clamping of the video signals is performed downstream

by digital fine clamping within the ADV7188. The ADCs are

configured to run in 4× oversampling mode.

The ADV7188 has optional antialiasing filters on each of

the four input channels. The filters are designed for standard

definition (SD) video with approximately 6 MHz bandwidth.

SCART and overlay functionality are enabled by the ability of

the ADV7188 to process CVBS and standard definition RGB

signals simultaneously. Signal mixing is controlled by the fast

blank (FB) pin.

STANDARD DEFINITION PROCESSOR (SDP)

The ADV7188 is capable of decoding a large selection of baseband

video signals in composite, S-video, and component formats. The

video standards that are supported include PAL B/D/I/G/H,

PAL 60, PAL M, PAL N, PAL Nc, NTSC M/J, NTSC 4.43, and

SECAM B/D/G/K/L. The ADV7188 can automatically detect

the video standard and process it accordingly.

The ADV7188 has a 5-line, superadaptive, 2D comb filter that

provides 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 without requiring user intervention.

Video user controls such as brightness, contrast, saturation, and

hue are also available within the ADV7188.

The ADV7188 implements the patented ADLLT algorithm to

track varying video line lengths from sources such as a VCR.

ADLLT enables the ADV7188 to track and decode poor quality

video sources such as VCRs and noisy sources from tuner outputs,

VCD players, and camcorders. The ADV7188 contains a CTI

processor that sharpens the edge rate of chroma transitions,

resulting in sharper vertical transitions.

The ADV7188 can process a variety of VBI data services, such

as closed captioning (CC), wide-screen signaling (WSS), copy

generation management system (CGMS), Gemstar® 1×/2×,

extended data service (XDS), and teletext. The ADV7188 is

fully Macrovision certified; detection circuitry enables Type I,

Type II, and Type III protection levels to be identified and

reported to the user. The decoder is also fully robust to all

Macrovision signal inputs.

FUNCTIONAL BLOCK DIAGRAM

AIN1– 12

AIN12

ANTI-

CLAMP ALIAS

FILTER

12

A/D

DATA

PREPROCESSOR

ANTI-

INPUT CLAMP ALIAS

MUX

FILTER

ANTI-

CLAMP ALIAS

FILTER

12

A/D

12

A/D

12

DECIMATION AND 12

DOWNSAMPLING 12

FILTERS

12

ANTI-

12

CLAMP ALIAS A/D

FILTER

SYNC PROCESSING AND

CLOCK GENERATION

SYNC AND

CLK CONTROL

FB

ADV7188

SCLK

SDA

ALSB

SERIAL INTERFACE

CONTROL AND VBI DATA

CONTROL

AND DATA

CVBS/Y

FSC

RECOVERY

CVBS

C

Cr

CHROMA

DEMOD

Cb

R

G COLOR SPACE

B CONVERSION

STANDARD DEFINITION PROCESSOR

LUMA

FILTER

SYNC

EXTRACT

CHROMA

FILTER

LUMA

RESAMPLE

RESAMPLE

CONTROL

CHROMA

RESAMPLE

Y

Cr

Cb

LUMA

2D COMB

Y

(5H MAX)

20

CHROMA Cr

2D COMB Cb

(4H MAX)

FAST BLANK

OVERLAY

CONTROL

AND

AV CODE

INSERTION

VBI DATA RECOVERY

MACROVISION

DETECTION

GLOBAL CONTROL

STANDARD

AUTODETECTION

SYNTHESIZED

LLC CONTROL

FREE-RUN

OUTPUT CONTROL

10 PIXEL

DATA

10 P19 TO P10

P9 TO P0

HS

VS

FIELD

LLC1

LLC2

SFL

INT

Figure 1.

Rev. A | Page 4 of 112

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