TDA4680 Philips Semiconductors, TDA4680 Datasheet - Page 2

• Manufacturer Part Number: TDA4680
• Description: Video processor with automatic cut-off and white level control
• Manufacturer: Philips Semiconductors

Philips Semiconductors
FEATURES
ORDERING INFORMATION
1996 Oct 25
TDA4680
TDA4680WP
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 I
Saturation, contrast and brightness adjustment via
I
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 I
Cut-off and white level measurement pulses in the last
4 lines of the vertical blanking interval (I
for PAL, SECAM, or NTSC, PAL-M)
Increased RGB signal bandwidths for progressive scan
and 100 Hz operation (selected via I
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 I
Three adjustable reference voltage levels (via I
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.
TYPE NUMBER
Video processor with automatic cut-off
and white level control
2
C-bus
2
C-bus
PLCC28
NAME
DIP28
2
C-bus
2
plastic dual in-line package; 28 leads (600 mil)
plastic leaded chip carrier; 28 leads
C-bus)
2
C-bus selection
2
C-bus
2
C-bus)
2
GENERAL DESCRIPTION
The TDA4680 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:
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 TDA4680 includes full
I
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 TDA4681 available. The only
differences are in the NTSC matrix.
2
DESCRIPTION
C-bus control of all parameters and functions with
Luminance and negative colour difference signals
2 or 3-level sandcastle pulse for internal timing pulse
generation
I
control.
2
PACKAGE
C-bus data and clock signals for microcontroller
Product specification
TDA4680
SOT117-1
SOT261-2
VERSION