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ADV7181 View Datasheet(PDF) - Analog Devices

Part NameDescriptionManufacturer
ADV7181 Multiformat SDTV Video Decoder ADI
Analog Devices ADI
ADV7181 Datasheet PDF : 104 Pages
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ADV7181
INTRODUCTION
The ADV7181 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
characteristics, including tape based sources, broadcast sources,
security/surveillance cameras, and professional systems.
ANALOG FRONT END
The ADV7181 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 ADV7181. 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 ADV7181. The
ADCs are configured to run in 4× oversampling mode.
STANDARD DEFINITION PROCESSOR
The ADV7181 is capable of decoding a large selection of
baseband video signals in composite, S-Video, and component
formats. The video standards supported by the SDP 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 ADV7181 can
automatically detect the video standard and process it
accordingly.
The ADV7181 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 ADV7181.
The ADV7181 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
ADV7181 to track and decode poor quality video sources such
as VCRs, noisy sources from tuner outputs, VCD players, and
camcorders. The ADV7181 contains a chroma transient
improvement (CTI) processor that sharpens the edge rate of
chroma transitions, resulting in sharper vertical transitions.
The SDP 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 ADV7181 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.
Rev. A | Page 4 of 104
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