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TDA4688 Datasheet

Video processor

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INTEGRATED CIRCUITS
DATA SHEET
TDA4688
Video processor with automatic
cut-off control
Product specification
Supersedes data of July 1993
File under Integrated Circuits, IC02
1997 Jun 23


NXP Semiconductors Electronic Components Datasheet

TDA4688 Datasheet

Video processor

No Preview Available !

Philips Semiconductors
Video processor with automatic cut-off control
Product specification
TDA4688
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 (Japan) 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 TDA4688 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 TDA4688
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 TDA4688 is a simplified, pin compatible (except for
pin 18) version of the TDA4681. The module address via
I2C-bus can be used for both ICs; where a function is not
included in the TDA4688 the I2C-bus command is not
executed. The differences with the TDA4681 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.
The difference compared to TDA4687 is the japanese type
NTSC matrix.
1997 Jun 23
2


Part Number TDA4688
Description Video processor
Maker NXP
PDF Download

TDA4688 Datasheet PDF





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