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NXP Semiconductors Electronic Components Datasheet

TDA4821P Datasheet

Autosize

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INTEGRATED CIRCUITS
DATA SHEET
TDA4821P
Autosize IC for colour monitors
Product specification
File under Integrated Circuits, IC02
2000 Feb 09


NXP Semiconductors Electronic Components Datasheet

TDA4821P Datasheet

Autosize

No Preview Available !

Philips Semiconductors
Autosize IC for colour monitors
Product specification
TDA4821P
FEATURES
Measuring of six horizontal and four vertical timing
parameters as follows:
– Horizontal: sync width, sync period, video start, video
end and horizontal flyback pulse start and end
– Vertical: sync width, sync period, first line of video
active and last line of video active.
Detection of H-sync and V-sync polarity
I2C-bus interface (maximum clock frequency 400 kHz)
for read-out of data and write data of the internal clock
multiplier using double byte (16-bit format)
Flexible digital clock input with built-in and (via I2C-bus)
adjustable clock multiplier; internal clock is 48 MHz
(typical value)
Horizontal measurements are expressed in number of
clock pulses; precision is approximately 20 ns at
48 MHz and can be improved if external averaging
methods are used
Vertical measurements are expressed in number of
lines
Internal buffer keep I2C-bus registers stable between
the V-sync pulses, allowing for asynchronous read-out.
The advantages are:
A more user friendly adjustment for any undefined video
mode by simply pressing a button
Factory alignment for a reduced number of modes
Saving of EEPROM storage space for factory and user
modes.
The activation of the autosizing function can be done on
user command or automatically on any mode change.
When autosizing is activated while the screen is only partly
active or consists of sub-windows, the picture size will
increase, but not more than the range limits of the monitor
allow.
GENERAL DESCRIPTION
The TDA4821P performs the ‘autosize’ feature for colour
monitors. The IC measures the timing of active H/V video
with respect to the H-sync and V-sync pulses and also with
respect to the horizontal flyback pulse in order to allow the
microcontroller to adjust the display settings automatically,
in particular parameters HSIZE, VSIZE, HPOS and VPOS.
ORDERING INFORMATION
TYPE
NUMBER
TDA4821P
NAME
DIP20
PACKAGE
DESCRIPTION
plastic dual in-line package; 20 leads (300 mil)
VERSION
SOT146-1
2000 Feb 09
2


Part Number TDA4821P
Description Autosize
Maker NXP
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