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TEA5040S Folha de dados(PDF) 3 Page - STMicroelectronics |
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TEA5040S Folha de dados(HTML) 3 Page - STMicroelectronics |
3 / 12 page 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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Descrição semelhante - TEA5040S |
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