DESCRIPTION

The Integrated VIP and Teletext (IVT1.1) is a teletext decoder (contained within a single-chip package) for decoding 625-line based World System Teletext transmissions. The teletext decoder hardware is based on a reduced function version of the device SAA5246 (IVT1.0).

FEATURES

• Complete teletext decoder including page memory in a single 40-pin DIL package

• Single +5 V power supply

• Digital data slicer and display clock phase-locked loop reduces peripheral components to a minimum

• Both video and scan related synchronization modes are supported

• On board single page memory including extension packets for FASTEXT

• Single page acquisition system

• RGB interface to standard colour decoder ICs, push-pull output drive

• Data capture performance similar to SAA5231 (VIP2)

• Simple software control via I2C-bus

• Option for five national languages

• 32 supplementary characters for on-screen displays

• Optional storage of packet 24 in the display memory

• Page links in packets 27 and 8/30 are Hamming decoded

• Separate text and video signal quality detectors, 625/525 video status and language version all readable via I2C-bus

• Automatic ODD/EVEN output control with manual override

• Control of display PLL free-run and rolling header via I2C-bus

• VCS to SCS mode for stable 525 line status display