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UNIVERSAL TELETEXT DECODERS

‘EUROTEXT’

‘EUROTEXT’ CF70200

CF70200

DRAFT 11

15-Feb-96 1Q96

12

5.0 RGB OUTPUTS - (continued)

Reference

Circuit

GND

GND

GND

Vcc

Vcc

Vcc

GND

R

RGBSET

R

L

R

L

R

L

R

G

B

Control

˜

3ohms

˜

3ohms

˜

3ohms

GND

5K (Typical)

Inside Eurotext

Outside Eurotext

RGBSET

REF

Vcc

GND

R

G

B

RGB Output Circuit Diagram.

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Summary of Contents for EUROTEXT CF70200

Page 1: ...4Q 95 Application Specific Integrated Circuits Consumer Products Family UNIVERSAL TELETEXT SYSTEMS Teletext Decoder EUROTEXT CF70200 Draft 1 ...

Page 2: ...OTEXT CHARACTER SETS 17 11 0 APPLICATIONS CIRCUITS 21 11 1 Circuit using CF70200 and CF72416 21 11 2 Circuit using CF70200 and CF72306 22 12 0 ABSOLUTE MAXIMUM RATINGS 23 13 0 RECOMMENDED OPERATING CONDITIONS 23 14 0 PACKAGING 25 28 pin Plastic Dual in Line Wide 25 44 pin PLCC package 26 Index of Tables TABLE 1 EUROTEXT FAMILY OF DEVICES 2 TABLE 2 PAGES STORED IN MEMORY 4 TABLE 3 PAGE SELECTED TO ...

Page 3: ...Hebrew languages and VPS data capture Table 1 On chip processing of packet 26 characters flicker free is automatically implemented as required All packets of type 26 are processed in real time without the need for any additional memory This allows the decoder to store eight pages of teletext irrespective of the language selected and the mode of operation On chip is an 11 5 MIPs micro coded process...

Page 4: ...tions as it is able to receive and decode PDC information from packets 26 and 8 30 and store this information inside the decoder In this mode of operation memory can also be assigned for menu pages pages downloaded from main microprocessor 1 1 Eurotext Family of Devices Other teletext devices are available in the Eurotext family These devices are all hardware and software compatible with the CF702...

Page 5: ... or magazine shuffle In addition to the four main modes of operation the decoder has two additional modes of operation Menu Page Sub Page In the Menu Page mode the page stores 6 and 7 can be redefined as either two menu pages or as one menu page and one page as a store for non display packets This mode allows the chip to be used for PDC applications In the Sub Page mode the decoder will capture th...

Page 6: ...e Red Basic TOP Table Inventory Page Basic TOP Table 2 P 1 Green Favourite Page 1 Add Information Table 3 P 2 Yellow Favourite Page 1 Add Information Table 4 P 3 Cyan Favourite Page 1 TOP Page 1 see below 5 P 4 Index Favourite Page 1 TOP Page 2 see below 6 Last Page Last Page Last Page TOP Page 3 see below 7 P 1 P 1 P 1 TOP Page 4 see below Add Information Table Table 2 Pages Stored in Memory The ...

Page 7: ...first powered up or after a change channel command one store is programmed with the page number 1F0 3Fxx hex This ensures that if the new channel has a TOP transmission the basic TOP table is captured in the shortest possible time The same store is also used to keep an inventory of the transmitted pages An inventory allows efficient use of the memory as once complete capture latches will only be s...

Page 8: ...for the display page is received 2 3 Favourite Page Mode In this mode the external microprocessor has full control over which pages are captured in five of eight page stores It can enable four favourite pages which will always be stored in memory with another store being used for the display page The four stores can be programmed with any page number between 100 and 8FF Sub pages cannot be program...

Page 9: ...es It will either search backwards in the TOP table and select the next page or the function of this key will depend upon the display page If a Block Page is displayed it will select the last Block Page if a Group Page is displayed it will select the last Group or Block Page and if a Normal Page is selected it will select the last Block Group or Normal Page GREEN key Next Block Group or Normal Pag...

Page 10: ... page Table 3 Page Selected to be Stored in TOP Mode TOP4 Page is Only Stored if There are Less than 3 Additional Information Tables 2 5 Sub Page Mode Sub page mode can be selected in any of the four main modes In sub page mode the decoder will capture the display sub page and the next two sub pages transmitted for the display page The row 24 display will show the current page number and the curre...

Page 11: ...ory in the Four Different Modes of Operation with Sub Page Mode Selected and Menu Page Mode not Selected 2 6 Menu Page Mode When the decoder is set to menu mode it reserves two pages of memory for uses other than receiving teletext The memory can be used for Menu pages for on screen displays Packet 8 30 format 2 data storage for PDC applications Packet 26 storage for PDC applications General purpo...

Page 12: ... serial control display attributes along with a BLANK fast blanking signal which allows the display to be viewed in modes TEXT MIX or BOX 5 0 RGB OUTPUTS The output current of the RGB outputs may be set by adjusting the value of a single resistor connected between RGBSET and AGND The RGB output stages contain a switch controlled by the internal RGB signal and an adjustable current source When the ...

Page 13: ...L Minimum and maximum output voltages can be calculated using the following equations R RGBSET R V 60 V L REF L R RGBSET R G B output current determined by this resistor value RL Load resistor on R G B outputs VREF Reference voltage VL R G B output voltage Ilmin 0 75 VREF RGBSET typ 60 R R Ilmax 1 25 V typ 60 R R REF RGBSET Ilmin max R G B output current R Resistor tolerance of R RGBSET The circui...

Page 14: ...CF70200 DRAFT 11 15 Feb 96 1Q96 12 5 0 RGB OUTPUTS continued Reference Circuit GND GND GND Vcc Vcc Vcc GND RRGBSET RL RL RL R G B Control 3ohms 3ohms 3ohms GND 5K Typical Inside Eurotext Outside Eurotext RGBSET REF Vcc GND R G B RGB Output Circuit Diagram ...

Page 15: ... are produced in the digital PLL TV sync timing block using the oscillator output from the Texas Instruments CF72306 or CF72416 data slicer The display sync signals generated are flexible and can be software controlled to provide interlaced or non interlaced text displays with locked of unlocked field sync The Eurotext chip uses a digital PLL which can lock onto a VCR playback video signal allowin...

Page 16: ...rminate the transmission by placing a start or stop condition on the bus after not acknowledging the last byte During the transfer EUROTEXT will continue to send data as long as the bus master acknowledges each byte and continues to issue clock pulses Handshaking Handshaking is carried out on a byte by byte level as described in the I2 C specification When EUROTEXT is not available for servicing t...

Page 17: ...o sync switch The signal to this pin should be AC coupled I2 C Interface SDA I2 C data line Open drain I O pin SCL I2 C clock line Open drain I O pin Display Pins BLANK Blanking This signal is high when teletext information is displayed on the RGB lines R G B Display data 75 ohm drive capacity RGBSET Adjustment for the RGB output levels The level of the RGB signals can be adjusted from 0 5V to 1 5...

Page 18: ...tor However this pin can be used if a hardware system reset is required MUTE Audio Mute control This signal is low when just text is displayed on the screen and a bad incoming video is detected It is intended to be connected to the TV audio muting circuit FLAG1 System information Input or output FLAG2 System information Input or output TEST1 5 Test pins These pins should be connected to ground or ...

Page 19: ...17 10 0 EUROTEXT CHARACTER SETS 0 1 2 3 4 5 6 7 National Option National Option National Option National Option 0 1 2 3 4 5 6 7 8 9 A B C D E F National Option National Option National Option National Option National Option National Option National Option National Option National Option ...

Page 20: ...UNIVERSAL TELETEXT DECODERS EUROTEXT EUROTEXT CF70200 CF70200 DRAFT 11 15 Feb 96 1Q96 18 10 0 EUROTEXT CHARACTER SETS Continued 8 9 A B C D E F 0 1 2 3 4 5 6 7 8 9 A B C D E F ...

Page 21: ...VERSAL TELETEXT DECODERS EUROTEXT EUROTEXT CF70200 CF70200 DRAFT 11 15 Feb 96 1Q96 19 10 0 EUROTEXT CHARACTER SETS Continued OSD ENGLISH SWEDISH GERMAN ITALIAN FRENCH 23 24 40 5B 5C 5D 5E 5F 60 7B 7C 7D 7E ...

Page 22: ...AL TELETEXT DECODERS EUROTEXT EUROTEXT CF70200 CF70200 DRAFT 11 15 Feb 96 1Q96 20 10 0 EUROTEXT CHARACTER SETS Continued SPANISH TURKISH CZECH POLISH SERBO CROAT ROMANIAN 23 24 40 5B 5C 5D 5E 5F 60 7B 7C 7D 7E ...

Page 23: ...7 18 19 20 21 22 23 24 25 26 27 BLANK TEST5 SYNC VIDEO VCC RSTB CLKIN GND TEST1 TEST4 TDATA TCLK CSB MUTE TEST2 FLAG2 FLAG1 REF RGBSET AGND RED GREEN VCC BLUE SDA SCL TEST3 WIND CF70200 28 pin DIL INPUT NOTE For best operation AGND2 and C2 ground should be directly connected to the Ground at the Video input source 11 12 13 14 15 16 17 18 19 20 TSIG SSIG CSIG AGND1 OSC1 OSC2 AVCC CREF AGND2 BIAS 1 ...

Page 24: ...20 21 22 23 24 25 26 27 BLANK TEST5 SYNC VIDEO VCC RSTB CLKIN GND TEST1 TEST4 TDATA TCLK CSB MUTE TEST2 FLAG2 FLAG1 REF RGBSET AGND RED GREEN VCC BLUE SDA SCL TEST3 WIND CF70200 28 pin DIL INPUT NOTE For best operation AGND2 ground should be directly connected to the Ground at the Video input source 11 12 13 14 15 16 17 18 19 20 TSIG SSIG CSIG AGND1 OSC1 OSC2 AVCC CREF AGND2 BIAS 1 2 3 4 5 6 7 8 9...

Page 25: ... extended periods may affect device reliability 13 0 RECOMMENDED OPERATING CONDITIONS Symbol Parameter Test Conditions min nom max unit Vcc Supply Voltage Vih min Vil max 4 75 5 00 5 25 V Vih High Level Input Voltage All inputs except SDA SCL 0 7 Vcc V Vil Low Level Input Voltage All inputs except SDA SCL 0 2 Vcc V Vih High Level Input Voltage SDA SCL 3 0 V Vil Low Level Input Voltage SDA SCL 1 5 ...

Page 26: ...mA Io Output Current R RGBSET 4K 14 9 24 8 mA RL RGB Load I RGBSET 33 A 750 RL RGB Load 110 A I RGBSET 33 0 A 75 CI Output Load Capacitance 50 750 pF Blank P Channel Open Drain Output Voh Output Voltage High Ioh 23mA 3 7 V Voh Output Voltage High Ioh 2 5mA 4 4 V Ioh Output Current High 23 mA CI Output Load Capacitance 50 pF Icc Supply Current Vcc max Active at fo 230 mA fo Operating Frequency 13 8...

Page 27: ...0 045 2 54 0 25 0 100 0 010 1 27 0 51 0 100 0 01 0 51 0 20 MIN 5 08 0 2 MAX 3 17 0 125 MIN 28 Pin Plastic Dual in line Wide Body Package Dimensions in millimetres inches 28 15 14 1 2 0 0 080 NOM 2 4 0 093 R NOM 2 8 0 110 NOM 36 6 1 44 MAX EITHER INDEX 0 84 0 033 MIN 1 27 0 51 0 050 0 020 C L SEATING PLANE C L 0 25 0 010 NOM 105 90 15 24 0 25 0 600 0 010 ...

Page 28: ...p 14 99 0 590 min at Seating Plane 1 27 0 050 T P Seating Plane The lead contact points are within 0 10 0 004 4 20 0 165 min FN PLASTIC CHIP CARRIER 20 terminal package used for illustration 17 65 0 695 min 16 662 0 656 max 17 40 0 685 min 16 510 0 650 min 1 22 0 048 1 07 0 0042 x 45º 0 81 0 032 0 66 0 026 Typ 0 53 0 021 0 33 0 013 0 51 0 020 R Max 3 Places 1 53 0 060 Min 0 64 0 025 Min 6 7 17 18 ...

Page 29: ...warranty Testing and other quality control techniques are utilised to the extent TI deems necessary to support this warranty Unless mandated by government requirements specific testing of all parameters of each device is not necessarily performed TI assumes no liability for TI applications assistance customer product design software performance or infringement of patents or services described here...

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