Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

TDA4681 Datasheet(PDF) 2 Page - NXP Semiconductors

Part No. TDA4681
Description  Video processor with automatic cut-off and white level control
Download  28 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo 

TDA4681 Datasheet(HTML) 2 Page - NXP Semiconductors

 
Zoom Inzoom in Zoom Outzoom out
 2 / 28 page
background image
1997 Mar 04
2
Philips Semiconductors
Product specification
Video processor with automatic cut-off
and white level control
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
PACKAGE
NAME
DESCRIPTION
VERSION
TDA4681
DIP28
plastic dual in-line package; 28 leads (600 mil)
SOT117-1
TDA4681WP
PLCC28
plastic leaded chip carrier; 28 leads
SOT261-2


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn