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TDA4780 Datasheet(PDF) 2 Page - NXP Semiconductors

Part No. TDA4780
Description  RGB video processor with automatic cut-off control and gamma adjust
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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TDA4780 Datasheet(HTML) 2 Page - NXP Semiconductors

 
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1997 Feb 06
2
Philips Semiconductors
Preliminary specification
RGB video processor with automatic
cut-off control and gamma adjust
TDA4780
FEATURES
• Gamma adjust
• Dynamic black control (adaptive black)
• All input signals clamped on black-levels
• Automatic cut-off control, alternative: output clamping
on fixed levels
• Three adjustable reference voltage levels via I2C-bus for
automatic cut-off control
• Luminance/colour difference interface
• Two luminance input levels allowed
• Two RGB interfaces controlled by either fast switches or
by I2C-bus
• Two peak drive limiters, selection via I2C-bus
• Blue stretch, selection via I2C-bus
• Luminance output for scan velocity modulation
(SCAVEM)
• Extra luminance output; same pin can be used as hue
control output e.g. for the TDA4650 and TDA4655
• Non standard operations like 50 Hz/32 kHz are also
possible
• Either 2 or 3 level sandcastle pulse applicable
• High bandwidth for 32 kHz application
• White point adjusts via I2C-bus
• Average beam current and improved peak drive limiting
• Two switch-on delays to prevent discoloration during
start-up
• All functions and features programmable via I2C-bus
• PAL/SECAM or NTSC matrix selection.
GENERAL DESCRIPTION
The TDA4780 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 or TDA4665 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.
Two sets of analog RGB colour signals can also be
inserted, e.g. one from a peritelevision connector
(SCART plug) and the other one from an On-Screen
Display (OSD) generator. The TDA4780 has 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.
In clamped output mode it can also be used as an RGB
source.
The main differences with the sister type TDA4680 are:
• Additional features, namely gamma adjust, adaptive
black, blue stretch and two different peak drive limiters
• The measurement lines are triggered by the trailing
edge of the vertical component of the sandcastle pulse
• I2C-bus receiver only. Automatic white level control is
not provided; the white levels are determined directly by
the I2C-bus data.
• The TDA4780 is pin compatible (except pin 18) with the
TDA4680. The I2C-bus slave address can be used for
both ICs. When a function of the TDA4780 is not
included in the TDA4680, the I2C-bus command is not
executed. Special commands (except control bit FSWL)
for the TDA4680 will be ignored by the TDA4780.


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