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ADV7178 Scheda tecnica(PDF) 4 Page - Analog Devices |
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ADV7178 Scheda tecnica(HTML) 4 Page - Analog Devices |
4 / 44 page ADV7177/ADV7178 Rev. C | Page 4 of 44 GENERAL DESCRIPTION The ADV7177/AD7178 are integrated digital video encoders that convert digital CCIR-601 4:2:2 8- or 16-component video data into a standard analog baseband television signal compatible with worldwide standards. The 4:2:2 YUV video data is interpolated to 2× the pixel rate. The color-difference components (UV) are quadrature modulated using a subcarrier frequency generated by an on-chip, 32-bit digital synthesizer (also running at 2× the pixel rate). The 2× pixel rate sampling allows for better signal-to-noise ratio. A 32-bit DDS with a 9-bit look-up table produces a superior subcarrier in terms of both frequency and phase. In addition to the composite output signal, there is the facility to output S-video (Y/C video), YUV or RGB video. Each analog output is capable of driving the full video-level (34.7 mA) signal into an unbuffered, doubly terminated 75 Ω load. With external buffering, the user has the additional option to scale back the DAC output current to 5 mA min, thereby significantly reducing the power dissipation of the device. The ADV7177/ADV7178 also support both PAL and NTSC square pixel operation. The output video frames are synchronized with the incoming data timing reference codes. Optionally, the encoder accepts (and can generate) HSYNC, VSYNC, and FIELD timing signals. These timing signals can be adjusted to change pulse width and position while the parts are in master mode. The encoder requires a single, 2× pixel rate (27 MHz) clock for standard operation. Alternatively, the encoder requires a 24.5454 MHz clock for NTSC or 29.5 MHz clock for PAL square pixel mode operation. All internal timing is generated on-chip. The ADV7177/ADV7178 modes are set up over a 2-wire serial bidirectional port (I2C-compatible) with two slave addresses. Functionally, the ADV7178 and the ADV7177 are the same except that the ADV7178 can output the Macrovision anticopy algorithm, and OSD is only supported on the ADV7177. The ADV7177/ADV7178 are packaged in a 44-lead, thermally enhanced MQFP package. |
Codice articolo simile - ADV7178_15 |
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Descrizione simile - ADV7178_15 |
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