Video processor - NXP
Description
INTEGRATED CIRCUITS
DATA SHEET
TDA4687 Video processor with automatic cut-off control
Product specification Supersedes data of May 1993 File under Integrated Circuits, IC02 1997 Jun 23
Philips Semiconductors
Product specification
Video processor with automatic cut-off control
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 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
TDA4687
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 TDA4687 includes...
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