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TDA4680WP Datasheet(PDF) 2 Page - NXP Semiconductors |
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TDA4680WP Datasheet(HTML) 2 Page - NXP Semiconductors |
2 / 28 page 1996 Oct 25 2 Philips Semiconductors Product specification Video processor with automatic cut-off and white level control TDA4680 FEATURES • Operates from an 8 V DC supply • Black level clamping of the colour difference, luminance and RGB input signals with coupling-capacitor DC level storage • Two fully-controlled, analog RGB inputs, selected either by fast switch signals or via I2C-bus • Saturation, contrast and brightness adjustment via I2C-bus • Same RGB output black levels for Y/CD and RGB input signals • Timing pulse generation from either a 2 or 3-level sandcastle pulse for clamping, horizontal and vertical synchronization, cut-off and white level timing pulses • Automatic cut-off control with picture tube leakage current compensation • Software-based automatic white level control or fixed white levels via I2C-bus • Cut-off and white level measurement pulses in the last 4 lines of the vertical blanking interval (I2C-bus selection for PAL, SECAM, or NTSC, PAL-M) • Increased RGB signal bandwidths for progressive scan and 100 Hz operation (selected via I2C-bus) • Two switch-on delays to prevent discolouration before steady-state operation • Average beam current and peak drive limiting • PAL/SECAM or NTSC matrix selection via I2C-bus • Three adjustable reference voltage levels (via I2C-bus) for automatic cut-off and white level control • Emitter-follower RGB output stages to drive the video output stages • Hue control output for the TDA4555, TDA4650/T, TDA4655/T or TDA4657. GENERAL DESCRIPTION The TDA4680 is a monolithic integrated circuit with a colour difference interface for video processing in TV receivers. Its primary function is to process the luminance and colour difference signals from multistandard colour decoders, TDA4555, TDA4650/T, TDA4655/T or TDA4657, Colour Transient Improvement (CTI) IC, TDA4565, Picture Signal Improvement (PSI) IC, TDA4670, or from a feature module. The required input signals are: • Luminance and negative colour difference signals • 2 or 3-level sandcastle pulse for internal timing pulse generation • I2C-bus data and clock signals for microcontroller control. Two sets of analog RGB colour signals can also be inserted, e.g. one from a peritelevision connector and the other from an on-screen display generator; both inputs are fully-controlled internally. The TDA4680 includes full I2C-bus control of all parameters and functions with automatic cut-off and white level control of the picture tube cathode currents. It provides RGB output signals for the video output stages. There is a very similar IC TDA4681 available. The only differences are in the NTSC matrix. ORDERING INFORMATION TYPE NUMBER PACKAGE NAME DESCRIPTION VERSION TDA4680 DIP28 plastic dual in-line package; 28 leads (600 mil) SOT117-1 TDA4680WP PLCC28 plastic leaded chip carrier; 28 leads SOT261-2 |
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