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ADV7175KS датащи(PDF) 6 Page - Analog Devices |
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ADV7175KS датащи(HTML) 6 Page - Analog Devices |
6 / 36 page ADV7175/ADV7176 REV. A –6– The ADV7175/ADV7176 is protected by U.S. Patent Numbers 5,343,196 and 5,442,355 and other intellectual property rights. DATA PATH DESCRIPTION For PAL B, D, G, H, I, M, N and NTSC M, N modes, YCrCb 4:2:2 data is input via the CCIR-656 compatible pixel port at a 13.5 MHz data rate. The pixel data is de-multiplexed to form three data paths. Y has a range of 16 to 235, Cr and Cb have a range of 128 ± 112. The ADV7175/ADV7176 supports PAL (B, D, G, H, I, N, M) and NTSC (with and without Pedestal) standards. The appropriate SYNC, BLANK and burst levels are added to the YCrCb data. Macrovision antitaping (ADV7175 only) and close-captioning levels are also added to Y and the resultant data is interpolated to a rate of 27 MHz. The interpo- lated 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 appro- priate SYNC and BLANK levels. The RGB data is in sychro- nization 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. 10-bit composite video + 8-bit RGB video. 2. 10-bit composite video + 8-bit YUV video. 3. Two 10-bit composite video signals + 10-bit LUMA & CHROMA (Y/C) signals. Alternatively, each DAC can be individually powered off if not required. All possible video outputs are illustrated in Appendix 3, 4 and 5. INTERNAL FILTER RESPONSE The Y filter supports several different frequency responses in- cluding two 4.5/5.0 MHz low-pass and PAL/NTSC subcarrier notch responses. The U and V filters have a 0.6/1 0.3 MHz low-pass response. These filter characteristics are illustrated in Figures 3 to 11. (Continued from page 1) The ADV7175/ADV7176 also supports both a PAL and NTSC square pixel mode in slave mode. The video encoder accepts an 8-bit parallel pixel data stream in CCIR-656 format or a 16-bit parallel data stream. This 4:2:2 data stream is interpolated into 4:4:4 component video (YUV). The YUV video 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 synthesizer (also running at two times the pixel rate). The two times pixel rate sampling allows more accurate generation of the subcarrier because frequency and phase errors are reduced by the higher sampling rate. The ADV7175/ADV7176 also offers the option to output the YUV information directly. The luminance and chrominance components are digitally com- bined and the resulting composite signal is output via a 10-bit DAC. Three additional 10-/8-bit DACs are provided to output S-VHS Y/C Video (10 bits), YUV or RGB Video (8 bits). The output video frames are synchronized with the incoming data timing reference codes. Optionally the encoder accepts (and can generate) HSYNC, VSYNC & FIELD timing signals. These timing signals can be adjusted to change pulse width and posi- tion 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 24.54 MHz clock for NTSC or 29.5 MHz clock for PAL square pixel mode operation. All in- ternal clocks are generated on-chip. The ADV7175/ADV7176 modes are set up over a two wire serial bidirectional port (I 2C Compatible) with two slave addresses. Additionally, the ADV7175/ADV7176 allows a subcarrier phase lock with an external video source and has a color bar generator on-board. Functionally the ADV7175 and ADV7176 are the same with the exception that the ADV7175 can output the Macrovision (Revision 6.1/7.x) anticopy algorithm. The ADV7175/ADV7176 is fabricated in a +5 V CMOS pro- cess. Its monolithic CMOS construction ensures greater func- tionality with low power dissipation. The ADV7175/ADV7176 is packaged in a 44-pin thermally en- hanced PQFP package (patent pending). MR04 MR03 NTSC 0 0 2.3 0.026 7.5 >50 4.2 PAL 0 0 3.4 0.098 8.0 >51.3 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 8.0 >40 5.65 NTSC 1 1 2.3 0.054 7.5 >54 4.2 PAL 1 1 3.4 0.106 8.0 >50.3 5.0 FILTER SELECTION F3dB PASSBAND CUT OFF (MHz) STOPBAND CUT OFF (MHz) PASSBAND RIPPLE (dB) STOPBAND ATTENUATION (dB) Figure 3. Y Filter Specifications NTSC 1.0 0.085 3.6 >40 0.3 2.05 PAL 1.3 0.04 4.0 >40 0.02 2.45 FILTER SELECTION F3dB PASSBAND CUT OFF (MHz) STOPBAND CUT OFF (MHz) PASSBAND RIPPLE (dB) STOPBAND ATTENUATION (dB) ATTENUATION @ 1.3MHz (dB) Figure 4. UV Filter Specifications |
Аналогичный номер детали - ADV7175KS |
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Аналогичное описание - ADV7175KS |
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