參數(shù)資料
型號(hào)： TDA4688
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 消費(fèi)家電
英文描述： Video processor with automatic cut-off control
中文描述： SPECIALTY CONSUMER CIRCUIT, PDIP28
文件頁(yè)數(shù)： 2/24頁(yè)
文件大?。?/td> 130K
代理商： TDA4688
1997 Jun 23
2
Philips Semiconductors
Product specification
Video processor with automatic cut-off control
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 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 (Japan) 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 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
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 TDA4688
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 TDA4688 is a simplified, pin compatible (except for
pin 18) version of the TDA4681. The module address via
I
2
C-bus can be used for both ICs; where a function is not
included in the TDA4688 the I
2
C-bus command is not
executed. The differences with the TDA4681 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.
The difference compared to TDA4687 is the japanese type
NTSC matrix.
相關(guān)PDF資料
PDF描述
TDA4689 Video processor with automatic cut-off control
TDA4691 Sync Processor with Clock SPC
TDA4691T Sync Processor with Clock SPC
TDA4860 Vertical deflection power amplifier for monitors
TDA4861 Vertical deflection power amplifier for monitors
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA4689 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Video processor with automatic cut-off control
TDA4691 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Sync Processor with Clock SPC
TDA4691T 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Sync Processor with Clock SPC
TDA4700 制造商:INFINEON 制造商全稱(chēng):Infineon Technologies AG 功能描述:Control IC for Single-Ended and Push-Pull Switched-Mode Power Supplies SMPS
TDA4700A 制造商:INFINEON 制造商全稱(chēng):Infineon Technologies AG 功能描述:Control IC for Single-Ended and Push-Pull Switched-Mode Power Supplies SMPS
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*