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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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ADV7188 Fiches technique(PDF) 4 Page - Analog Devices |
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ADV7188 Fiches technique(HTML) 4 Page - Analog Devices |
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4 / 112 page  ADV7188 Rev. A | Page 4 of 112 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 A/D ANTI- ALIAS FILTER 12 A/D ANTI- ALIAS FILTER 12 A/D ANTI- ALIAS FILTER 12 A/D ANTI- ALIAS FILTER 12 AIN1– AIN12 12 INPUT MUX DATA PREPROCESSOR LUMA FILTER SYNC EXTRACT CHROMA FILTER LUMA RESAMPLE RESAMPLE CONTROL FSC RECOVERY CHROMA RESAMPLE CHROMA DEMOD COLOR SPACE CONVERSION LUMA 2D COMB (5H MAX) CHROMA 2D COMB (4H MAX) CVBS DECIMATION AND DOWNSAMPLING FILTERS 12 12 12 12 Cr Y Cb CLAMP CLAMP CLAMP CLAMP FAST BLANK OVERLAY CONTROL AND AV CODE INSERTION VBI DATA RECOVERY MACROVISION DETECTION GLOBAL CONTROL STANDARD AUTODETECTION SYNTHESIZED LLC CONTROL FREE-RUN OUTPUT CONTROL 20 STANDARD DEFINITION PROCESSOR R G B Cr Cb C 10 10 PIXEL DATA P19 TO P10 P9 TO P0 HS SFL LLC2 LLC1 FIELD VS INT CONTROL AND DATA FB SYNC PROCESSING AND CLOCK GENERATION SERIAL INTERFACE CONTROL AND VBI DATA SYNC AND CLK CONTROL ADV7188 Y Cr Cb CVBS/Y SCLK SDA ALSB Figure 1. |
Numéro de pièce similaire - ADV7188_15 |
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Description similaire - ADV7188_15 |
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