Video processor - NXP
Description
INTEGRATED CIRCUITS
DATA SHEET
TDA4685 Video processor with automatic cut-off control
Product specification Supersedes data of May 1993 File under Integrated Circuits, IC02 1997 Jun 20
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 • 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.
GENERAL DESCRIPTION The TDA4685 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.
ORDERING INFORMATION PACKAGE TYPE NUMBER NAME TDA4685 DIP28 DESCRIPTION plastic dual in-line package; 28 leads (600 mil) The required input ...
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