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TDA4689 Datasheet(PDF) 2 Page - NXP Semiconductors |
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TDA4689 Datasheet(HTML) 2 Page - NXP Semiconductors |
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2 / 24 page  1997 Jul 01 2 Philips Semiconductors Product specification Video processor with automatic cut-off control TDA4689 FEATURES • Operates from an 8 V DC supply • Black level clamping of the colour difference, luminance and RGB input signals with coupling-capacitor for DC level storage • Two analog RGB inputs, selected either by fast switch signals or via I2C-bus; brightness and contrast control of both RGB inputs • Saturation, contrast, brightness and white 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, vertical synchronization and cut-off timing pulses • Automatic cut-off control or clamped output selectable via I2C-bus • Automatic cut-off control with picture tube leakage current compensation • Cut-off measurement pulses after end of the vertical blanking pulse or end of an extra vertical flyback pulse • Ultra-black or nominal black blanking selectable via I2C-bus in clamped output mode • 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 • Emitter-follower RGB output stages to drive the video output stages • I2C-bus controlled DC output e.g. for hue-adjust of NTSC (multistandard) decoders • Positive amplification factor of cut-off control voltage. GENERAL DESCRIPTION The TDA4689 is a monolithic integrated circuit with a luminance and a colour difference interface for video processing in TV receivers. Its primary function is to process the luminance and colour difference signals from a colour decoder which is equipped e.g. with the multistandard decoder TDA4655 or TDA9160 plus delay line TDA4661 and the Picture Signal Improvement (PSI) IC, TDA467x, 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. The TDA4689 includes full I2C-bus control of all parameters and functions with automatic cut-off control of the picture tube cathode currents. It provides RGB output signals for the video output stages. The TDA4689 is a simplified, pin compatible (except for pin 18) version of the TDA4680. The special module address of the TDA4689 avoids conflicts with other video processors. A similar software, as used for the TDA4687 or TDA4680 could be used; where a function is not included in the TDA4689 the I2C-bus command is not executed. The differences with the TDA4680 are: • No automatic white level control; the white levels are determined directly by the I2C-bus data • RGB reference levels for automatic cut-off control are not adjustable via I2C-bus • Clamping delay is fixed • Only contrast and brightness adjust for the RGB input signals • The measurement lines are triggered either by the trailing edge of the vertical component of the sandcastle pulse or by the trailing edge of an optional external vertical flyback pulse (on pin 18), according to which occurs first. ORDERING INFORMATION TYPE NUMBER PACKAGE NAME DESCRIPTION VERSION TDA4689 DIP28 plastic dual in-line package; 28 leads (600 mil) SOT117-1 |
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