The DDP 3316C is the successor of the DDP 3315C, designed for high-quality backend applications in single and double-scan, as well as HDTV TV sets with 4:3 or 16:9 picture tubes. The interfaces qualify the IC for combination with state-of-the-art digital scan rate converters, especially the FRCA, as well as analog HDTV sources. It contains the entire digital video component and deflection processing and all analog interfaces for displaying the picture on a CRT. |
System ArchitectureA clock generator converts different external line- locked clock rates to a common internal sample rate, in order to provide a higher horizontal resolution. The input interface accepts ITU-R 601 and ITU-R 656 with encoded or external sync. The horizontal scaler is used for the scan rate conversion and for the nonlinear aspect ratio conversion as well. The horizontal deflection is synchronized with two numeric phase-locked loops (PLL) to the incoming sync. One PLL generates the horizontal timing signals, for example blanking and key-clamping. The second PLL adjusts the phase of the horizontal drive pulse with a subpixel accuracy of less than 1 ns.
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| Block diagram of the DDP 3316C |
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Main Features
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Selectable third analog RGB input
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SVM through-loop with OSD blanking capability
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Analog alpha blending input for RGB1 input and digital video
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Five additional PWM outputs
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One additional programmable horizontal decoder output
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Picture frame generator
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PMQFP80-11 package, 5 V analog and 3.3 V digital supply
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Video Processing
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Digital ITU-R 601 4:1:1/4:2:2 input at 27/32 MHz or double scan ITU-R 656 input at 54 MHz
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Linear horizontal scaling (0.25...4), as well as
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Nonlinear horizontal scaling “panorama vision”
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Dynamic black level expander (BLE)
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Luma sharpness enhancement (LSE) by dynamic peaking and luma transient improvement (LTI)
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Color transient improvement (CTI)
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Programmable RGB matrix
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Black/blue stretch, gamma correction via pro non-linear colorspace enhancer (NCE) on RGB
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Two analog double scan inputs with fast blank (one RGB and one RGB/YCrCb/YPrPb selectable)
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Tube Control
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Average and peak beam current limiterAutomatic picture tube adjustment (cutoff, drive)
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histogram calculation Deflection Processing
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Scan velocity modulation output
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Nonlinear EHT compensation for vertical/east-west
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Selectable HOUT startup behavior via pin
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Soft start/stop of horizontal-drive
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Vertical angle and bow correction
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Horizontal frequency for VGA/SVGA/1080I
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Black switch-off procedure
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Supports horizontal and vertical dynamic focus
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Horizontal and vertical protection circuit
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