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ADV7183AKST Datasheet(PDF) 4 Page - Analog Devices |
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ADV7183AKST Datasheet(HTML) 4 Page - Analog Devices |
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4 / 104 page  ADV7183A Rev. A | Page 4 of 104 INTRODUCTION The ADV7183A 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 ADV7183A analog front end comprises three 10-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 12-channel input mux that enables multiple video signals to be applied to the ADV7183A. 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 ADV7183A. The ADCs are configured to run in 4× oversampling mode. STANDARD DEFINITION PROCESSOR The ADV7183A 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 ADV7183A can automatically detect the video standard and process it accordingly. The ADV7183A 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 ADV7183A. The ADV7183A 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 ADV7183A to track and decode poor quality video sources such as VCRs, noisy sources from tuner outputs, VCD players, and camcorders. The ADV7183A 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 ADV7183A 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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