ADV7181BBSTZ データシートの表示（PDF） - Analog Devices

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ADV7181BBSTZ

Multiformat SDTV Video Decoder

Analog Devices 

INTRODUCTION

The ADV7181B 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 and 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 charac-

teristics, including tape based sources, broadcast sources,

security/surveillance cameras, and professional systems.

ANALOG FRONT END

The ADV7181B analog front end comprises three 9-bit ADCs

that digitize the analog video signal before applying it to the

standard definition processor. The analog front end employs

differential channels to each ADC to ensure high performance

in mixed-signal applications.

The front end also includes a 6-channel input mux that enables

multiple video signals to be applied to the ADV7181B. 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 ADV7181B.

The ADCs are configured to run in 4× oversampling mode.

ADV7181B

STANDARD DEFINITION PROCESSOR

The ADV7181B is capable of decoding a large selection of

baseband video signals in composite, S-Video, and component

formats. The video standards supported by the ADV7181B

include PAL B/D/I/G/H, PAL60, PAL M, PAL N, PAL Nc, NTSC

M/J, NTSC 4.43, and SECAM B/D/G/K/L. The ADV7181B can

automatically detect the video standard and process it

accordingly.

The ADV7181B has a 5-line, superadaptive, 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 video

standard and signal quality with no user intervention required.

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

hue are also available within the ADV7181B.

The ADV7181B 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

ADV7181B to track and decode poor quality video sources such

as VCRs, noisy sources from tuner outputs, VCD players, and

camcorders. The ADV7181B contains a chroma transient

improvement (CTI) processor that sharpens the edge rate of

chroma transitions, resulting in sharper vertical transitions.

The ADV7181B can process a variety of VBI data services such

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

generation management system (CGMS), EDTV, Gemstar

1×/2×, and extended data service (XDS). The ADV7181B is

fully Macrovision certified; detection circuitry enables Type I,

II, and III protection levels to be identified and reported to the

user. The decoder is also fully robust to all Macrovision signal

inputs.

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