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ADV7176AKS Arkusz danych(PDF) 11 Page - Analog Devices |
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ADV7176AKS Arkusz danych(HTML) 11 Page - Analog Devices |
11 / 52 page ADV7175A/ADV7176A –11– REV. B signal compatible with worldwide standards. The 4:2:2 YUV video data is interpolated to two times 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 two times the pixel rate). The two times pixel rate sampling allows for better signal-to- noise-ratio. A 32-bit DDS with a 10-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. The Y/C, YUV or RGB format is simultaneously available at the analog outputs with the composite video signal. Each analog output is capable of driving the full video-level (35 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 signifi- cantly reducing the power dissipation of the device. The ADV7175A/ADV7176A also supports 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 pulsewidth and position while the part is in the master mode. The encoder requires a single two times pixel rate (27 MHz) clock for standard operation. Alternatively, the encoder requires a 24.54 MHz clock for NTSC or 29.5 MHz clock for PAL square pixel mode operation. All internal timing is generated on-chip. A separate teletext port enables the user to directly input teletext data during the vertical blanking interval. The ADV7175A/ADV7176A modes are set up over a two-wire serial bidirectional port (I 2C Compatible) with two slave addresses. Functionally the ADV7175A and ADV7176A are the same with the exception that the ADV7175A can output the Macrovision anticopy algorithm. The ADV7175A/ADV7176A is packaged in a 44-lead thermally enhanced PQFP package. DATA PATH DESCRIPTION For PAL B, D, G, H, I, M, N and NTSC M modes, YCrCb 4:2:2 data is input via the CCIR-656 compatible pixel port at a 27 MHz Data Rate. The pixel data is demultiplexed to from three data paths. Y typically has a range of 16 to 235, Cr and Cb typically have a range of 128 ± 112; however, it is possible to input data from 1 to 254 on both Y, Cb and Cr. The ADV7175A/ADV7176A supports PAL (B, D, G, H, I, N, M) and NTSC (with and without Pedestal) standards. The ap- propriate SYNC, BLANK and Burst levels are added to the YCrCb data. Macrovision antitaping (ADV7175A only), closed captioning and teletext levels are also added to Y, and the resultant data is interpolated to a rate of 27 MHz. The interpolated data is filtered and scaled by three digital FIR filters. The U and V signals are modulated by the appropriate subcarrier sine/cosine phases and added together to make up the chromi- nance signal. The luma (Y) signal can be delayed 1–3 luma cycles (each cycle is 74 ns) with respect to the chroma signal. The luma and chroma signals are then added together to make up the composite video signal. All edges are slew rate limited. The YCrCb data is also used to generate RGB data with appropriate SYNC and BLANK levels. The RGB data is in synchronization with the composite video output. Alternatively analog YUV data can be generated instead of RGB. The four 10-bit DACs can be used to output: 1. Composite Video + RGB Video. 2. Composite Video + YUV Video 3. Two Composite Video Signals + LUMA and CHROMA 3. (Y/C) Signals. Alternatively, each DAC can be individually powered off if not required. Video output levels are illustrated in Appendix 4 and Appendix 5. INTERNAL FILTER RESPONSE The Y filter supports several different frequency responses, including two 4.5 MHz/5.0 MHz low pass responses, PAL/ NTSC subcarrier notch responses and a PAL/NTSC extended response. The U and V filters have a 2/2.4 MHz low-pass response for NTSC/PAL. These filter characteristics are illus- trated in Figures 4 to 12. MR04 MR03 NTSC 0 0 2.3 0.026 7.0 >54 4.2 PAL 0 0 3.4 0.098 7.3 >50 5.0 NTSC 0 1 1.0 0.085 3.57 >27.6 2.1 PAL 0 1 1.4 0.107 4.43 >29.3 2.7 NTSC/PAL 1 0 4.0 0.150 7.5 >40 5.65 NTSC 1 1 2.3 0.054 7.0 >54 4.2 PAL 1 1 3.4 0.106 7.3 >50.3 5.0 FILTER SELECTION F3dB PASSBAND CUTOFF (MHz) STOPBAND CUTOFF (MHz) PASSBAND RIPPLE (dB) STOPBAND ATTENUATION (dB) Figure 4. Luminance Internal Filter Specifications NTSC 1.0 0.085 3.2 >40 0.3 2.05 PAL 1.3 0.04 4.0 >40 0.02 2.45 FILTER SELECTION F3dB PASSBAND CUTOFF (MHz) STOPBAND CUTOFF (MHz) PASSBAND RIPPLE (dB) STOPBAND ATTENUATION (dB) ATTENUATION @ 1.3MHz (dB) Figure 5. Chrominance Internal Filter Specifications (Continued from page 1) |
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