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參數資料
| 型號： | TDA4689 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | Video processor with automatic cut-off control |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP28 |
| 文件頁數： | 2/24頁 |
| 文件大小： | 129K |
| 代理商： | TDA4689 |
1997 Jul 01
2
Philips Semiconductors
Product specification
Video processor with automatic cut-off control
TDA4689
FEATURES
Operates from an 8 V DC supply
Black level clamping of the colour difference, luminance
and RGB input signals with coupling-capacitor for DC
level storage
Two analog RGB inputs, selected either by fast switch
signals or via I
2
C-bus; brightness and contrast control of
both RGB inputs
Saturation, contrast, brightness and white adjustment
via I
2
C-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 I
2
C-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
I
2
C-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 matrix selection via I
2
C-bus
Emitter-follower RGB output stages to drive the video
output stages
I
2
C-bus controlled DC output e.g. for hue-adjust of
NTSC (multistandard) decoders
Positive amplification factor of cut-off control voltage.
GENERAL DESCRIPTION
The TDA4689 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
I
2
C-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 TDA4689
includes full I
2
C-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 TDA4689 is a simplified, pin compatible (except for
pin 18) version of the TDA4680. The special module
address of the TDA4689 avoids conflicts with other video
processors. A similar software, as used for the TDA4687
or TDA4680 could be used; where a function is not
included in the TDA4689 the I
2
C-bus command is not
executed. The differences with the TDA4680 are:
No automatic white level control; the white levels are
determined directly by the I
2
C-bus data
RGB reference levels for automatic cut-off control are
not adjustable via I
2
C-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.
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA4689
DIP28
plastic dual in-line package; 28 leads (600 mil)
SOT117-1
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