TEA5040S 데이터 시트보기 (PDF) - STMicroelectronics

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TEA5040S

WIDE BAND VIDEO PROCESSOR

STMicroelectronics 

TEA5040S

Table below depicts 9-bit words required for various functions.

Subsystem’s Configuration

BRIGHTNESS

CONTRAST

COLOUR ON/OFF

INSERTION

SYNC/ASYNC MODE

VIDEO INT/EXT

SATURATION B-Y

SATURATION R-Y

Min.

Max.

Min.

max.

Off

On

Allowed

Not Allow.

Sync.

Async.

Ext.

Int.

Min.

Max.

Min.

Max.

Data Bits

LSB....MSB

X00000

X11111

X00000

X11111

XXXXX0

XXXXX1

XXXXX0

XXXXX1

XXXX0X

XXXX1X

XXXXX0

XXXXX1

000000

111111

000000

1111

Add. Bits

LSB... .MSB

000

100

010

110

001

101

011

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/75Ω 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 three 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

3/12

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