參數(shù)資料
型號(hào)： ADV7189KST
廠商： ANALOG DEVICES INC
元件分類： 顏色信號(hào)轉(zhuǎn)換
英文描述： Multiformat SDTV Video Decoder
中文描述： COLOR SIGNAL DECODER, PQFP80
封裝： LEAD FREE, MS-026-BEC, LQFP-80
文件頁(yè)數(shù)： 4/104頁(yè)
文件大?。?/td> 890K
代理商： ADV7189KST
ADV7189
INTRODUCTION
The ADV7189 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.
Rev. A | Page 4 of 104
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 ADV7189 analog front end comprises three 12-bit Noise
Shaped Video 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 12-channel input mux that enables
multiple video signals to be applied to the ADV7189. 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 ADV7189. The
ADCs are configured to run in 4× oversampling mode.
STANDARD DEFINITION PROCESSOR
The ADV7189 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 ADV7189 can
automatically detect the video standard and process it
accordingly.
The ADV7189 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 ADV7189.
The ADV7189 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
ADV7189 to track and decode poor quality video sources such
as VCRs, noisy sources from tuner outputs, VCD players, and
camcorders. The ADV7189 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 ADV7189 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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