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TDA4681 Datasheet

Video processor

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INTEGRATED CIRCUITS
DATA SHEET
TDA4681
Video processor with automatic
cut-off and white level control
Product specification
Supersedes data of April 1993
File under Integrated Circuits, IC02
1997 Mar 04


NXP Semiconductors Electronic Components Datasheet

TDA4681 Datasheet

Video processor

No Preview Available !

Philips Semiconductors
Video processor with automatic cut-off
and white level control
Product specification
TDA4681
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 TDA4681 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 TDA4681 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 available, TDA4680. The only
differences are in the NTSC matrix.
ORDERING INFORMATION
TYPE NUMBER
TDA4681
TDA4681WP
NAME
DIP28
PLCC28
PACKAGE
DESCRIPTION
plastic dual in-line package; 28 leads (600 mil)
plastic leaded chip carrier; 28 leads
VERSION
SOT117-1
SOT261-2
1997 Mar 04
2


Part Number TDA4681
Description Video processor
Maker NXP
PDF Download

TDA4681 Datasheet PDF






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