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TEA5040S Folha de dados(PDF) 3 Page - STMicroelectronics

Nome de Peças TEA5040S
Descrição Electrónicos  WIDE BAND VIDEO PROCESSOR
Download  12 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
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TEA5040S Folha de dados(HTML) 3 Page - STMicroelectronics

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Table below depicts 9-bit words required for various functions.
Subsystem’s Configuration
Data Bits
LSB....MSB
Add. Bits
LSB... .MSB
BRIGHTNESS
Min.
Max.
X00000
X11111
000
CONTRAST
Min.
max.
X00000
X11111
100
COLOUR ON/OF F
Off
On
XXXXX0
XXXXX1
010
INSERTION
Allowed
Not Allow.
XXXXX0
XXXXX1
110
SYNC/ASYNC MODE
Sync.
Async.
XXXX0X
XXXX1X
001
VIDEO INT/EXT
Ext.
Int.
XXXXX0
XXXXX1
101
SATURATION B-Y
Min.
Max.
000000
111111
011
SATURATION R-Y
Min.
Max.
000000
1111
111
A demultiplexer directs the data towards latches
which drive the appropriate control. More detailed
information about serial bus operation is given in
the following chapter.
Video Switch
The video switch has three inputs :
- an internal video input (pin 39),
- an external video input (pin 37),
- a synchro input (pin 41),
and two outputs :
- an internal video output (pin 40),
- a switchable video output (pin 42)
The 1Vpp composite video signal applied to the
internal video input is multiplied by two and then
appears as a 2Vpp low impedance composite
video signal at the output. This signal is used to
deliver a 1Vpp/75
Ω composite video signal to the
peri-TV plug.
The switchable video output can be any of the three
inputs. When the Int/Ext one active bit word is high
(address number 5), the internal video input is
selected. If not, either a regenerated synchro pulse
or the external video signal is directed towards this
output depending on the level of the Sync/Async
one active bit word (address number 4). As this
output is to be connected to the synchro integrated
circuit, RGB information derived from an external
source via the Peri-TV plug can be displayed on the
screen, the synchronization of the TV-set being
then made with an external video signal.
When RGB information is derived from a source
integrated in the TV-set, a teletext decoder for
example, the synchronization can be made either
on the internal video input (in case of synchronous
data) or on the synchro input (in case of asynchro-
nous data).
R, G, B Inputs
There are two sets of R, G, B inputs : one is to be
connected to the peri-TV plug (Ext R, G, B), the
second one to receive the information derived from
the TV-set itself (Int R, G, B).
In order to have a saturation control on a picture
coming from the R, G, B inputs too, it is necessary
to get R-Y, B-Y and Y signals from R, G, B informa-
tion : this is performed on the first matrix that
receives the three 0.9Vp (100% white) R, G, B
signals and delivers the corresponding Y, R-Y, B-Y
signals. These ones are multiplied by 1.4 in order
to make the R-Y and B-Y signals compatible with
the R-Y and B-Y TV mode inputs. The desired R,
G, B inputs are selected by means of 3 switches
controlled by the two fast blanking signal inputs. A
high level on FB external pin selects the external
RGB sources. The th ree selected inputs are
clamped in order to give the required DC level at
the output of this first matrix. The three not selected
inputs are clamped on a fixed DC level.
Y, R-Y, B-Y Inputs
The 2Vpp composite video signal appearing at the
switchable output of the video switch (pin 42) is
driven through the subcarrier trap and the lumi-
nance delay line with a 6 dB attenuation to the Y
input (1Vpp ; pin 12). In order to make this 1Vpp
(synchro to white) Y signal compatible with the
1Vpp (black to white) Y signal delivered by the first
matrix, it is necessary to multiply it by a coefficient
of 1.4.
R, G, B Insertion Pulse (fast blanking)
A R, G, B source has also to provide an insertion
TEA5040S
3/12


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