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TDA4780 Datasheet(PDF) 2 Page - NXP Semiconductors |
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TDA4780 Datasheet(HTML) 2 Page - NXP Semiconductors |
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2 / 44 page  1997 Feb 06 2 Philips Semiconductors Preliminary specification RGB video processor with automatic cut-off control and gamma adjust TDA4780 FEATURES • Gamma adjust • Dynamic black control (adaptive black) • All input signals clamped on black-levels • Automatic cut-off control, alternative: output clamping on fixed levels • Three adjustable reference voltage levels via I2C-bus for automatic cut-off control • Luminance/colour difference interface • Two luminance input levels allowed • Two RGB interfaces controlled by either fast switches or by I2C-bus • Two peak drive limiters, selection via I2C-bus • Blue stretch, selection via I2C-bus • Luminance output for scan velocity modulation (SCAVEM) • Extra luminance output; same pin can be used as hue control output e.g. for the TDA4650 and TDA4655 • Non standard operations like 50 Hz/32 kHz are also possible • Either 2 or 3 level sandcastle pulse applicable • High bandwidth for 32 kHz application • White point adjusts via I2C-bus • Average beam current and improved peak drive limiting • Two switch-on delays to prevent discoloration during start-up • All functions and features programmable via I2C-bus • PAL/SECAM or NTSC matrix selection. GENERAL DESCRIPTION The TDA4780 is a monolithic integrated circuit with a luminance and a colour difference interface for video processing in TV receivers. Its primary function is to process the luminance and colour difference signals from a colour decoder which is equipped e.g. with the multistandard decoder TDA4655 or TDA9160 plus delay line TDA4661 or TDA4665 and the Picture Signal Improvement (PSI) IC TDA467X or from a feature module. The required input signals are: • Luminance and negative colour difference signals • 2 or 3-level sandcastle pulse for internal timing pulse generation • I2C-bus data and clock signals. Two sets of analog RGB colour signals can also be inserted, e.g. one from a peritelevision connector (SCART plug) and the other one from an On-Screen Display (OSD) generator. The TDA4780 has I2C-bus control of all parameters and functions with automatic cut-off control of the picture tube cathode currents. It provides RGB output signals for the video output stages. In clamped output mode it can also be used as an RGB source. The main differences with the sister type TDA4680 are: • Additional features, namely gamma adjust, adaptive black, blue stretch and two different peak drive limiters • The measurement lines are triggered by the trailing edge of the vertical component of the sandcastle pulse • I2C-bus receiver only. Automatic white level control is not provided; the white levels are determined directly by the I2C-bus data. • The TDA4780 is pin compatible (except pin 18) with the TDA4680. The I2C-bus slave address can be used for both ICs. When a function of the TDA4780 is not included in the TDA4680, the I2C-bus command is not executed. Special commands (except control bit FSWL) for the TDA4680 will be ignored by the TDA4780. |
Similar Part No. - TDA4780 |
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Similar Description - TDA4780 |
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