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ADV7171KS Arkusz danych(PDF) 10 Page - Analog Devices |
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ADV7171KS Arkusz danych(HTML) 10 Page - Analog Devices |
10 / 55 page ADV7170/ADV7171 –10– REV. 0 GENERAL DESCRIPTION The ADV7170/ADV7171 is an integrated digital video encoder that converts Digital CCIR-601 4:2:2 8 or 16-bit component video data into a standard analog baseband television signal compatible with worldwide standards. The on-board SSAF (Super Sub-Alias Filter) with extended luminance frequency response and sharp stopband attenuation, enables studio quality video playback on modern TVs, giving optimal horizontal line resolution. An advanced power management circuit enables optimal control of power consumption in both normal operating modes and power-down or sleep modes. The ADV7170/ADV7171 also supports both PAL and NTSC square pixel operation. The parts also incorporate WSS and CGMS-A data control generation. 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 sig- nals. 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 stan- dard 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 tele- text data during the vertical blanking interval. The ADV7170/ADV7171 modes are set up over a two-wire serial bidirectional port (I 2C Compatible) with two slave addresses. Functionally, the ADV7171 and ADV7170 are the same with the exception that the ADV7170 can output the Macrovision anticopy algorithm. The ADV7170/ADV7171 is packaged in a 44-lead PQFP pack- age and a 44-lead TQFP package. 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 27 MHz data rate. The pixel data is demultiplexed to form 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 ADV7170/ ADV7171 supports PAL (B, D, G, H, I, M, N) and NTSC (with and without pedestal) standards. The appropriate SYNC, BLANK and Burst levels are added to the YCrCb data. Macrovision antitaping (ADV7170 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 sub- carrier sine/cosine phases and added together to make up the chrominance 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 ap- propriate 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 l0-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 (Y/C) Signals. Alternatively, each DAC can be individually powered off if not required. Video output levels are illustrated in Appendix 6. INTERNAL FILTER RESPONSE The Y filter supports several different frequency responses, including two low-pass responses, two notch responses, an extended (SSAF) response, a CIF response and a QCIF re- sponse. The UV filter supports several different frequency re- sponses, including four low-pass responses, a CIF response and a QCIF response, these can be seen in the following Figures 4 to 18. FILTER TYPE FILTER SELECTION PASSBAND RIPPLE (dB) 3 dB BANDWIDTH (MHz) STOPBAND CUTOFF (MHz) STOPBAND ATTENUATION (dB) MR04 0 0 0 0 1 1 1 MR03 0 0 1 1 0 0 1 MR02 0 1 0 1 0 1 0 LOW PASS (NTSC) LOW PASS (PAL) NOTCH (NTSC) NOTCH (PAL) EXTENDED (SSAF) CIF QCIF 0.091 0.15 0.015 0.095 0.051 0.018 MONOTONIC 4.157 4.74 6.54 6.24 6.217 3.0 1.5 7.37 7.96 8.3 8.0 8.0 7.06 7.15 –56 –64 –68 –66 –61 –61 –50 Figure 4. Luminance Internal Filter Specifications FILTER TYPE FILTER SELECTION PASSBAND RIPPLE (dB) 3 dB BANDWIDTH (MHz) STOPBAND CUTOFF (MHz) STOPBAND ATTENUATION (dB) MR07 0 0 0 0 1 1 1 MR06 0 0 1 1 0 0 1 MR05 0 1 0 1 0 1 0 1.3 MHz LOW PASS 0.65 MHz LOW PASS 1.0 MHZ LOW PASS 2.0 MHz LOW PASS RESERVED CIF QCIF 0.084 MONOTONIC MONOTONIC 0.0645 0.084 MONOTONIC 1.395 0.65 1.0 2.2 0.7 0.5 3.01 3.64 3.73 5.0 3.01 4.08 –45 –58.5 –49 –40 –45 –50 Figure 5. Chrominance Internal Filter Specifications |
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