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ADV7173 Datasheet(PDF) 2 Page - Analog Devices |
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ADV7173 Datasheet(HTML) 2 Page - Analog Devices |
2 / 59 page ADV7172/ADV7173 –2– REV. A FUNCTIONAL BLOCK DIAGRAM 8 8 10-BIT DAC RSET1 COMP1 ADV7172/ADV7173 COLOR DATA P0 VREF RSET2 COMP2 P7 DAC E DAC F DAC D DAC A DAC B DAC C BRIGHTNESS AND CONTRAST CONTROL + ADD SYNC + INTERPOLATOR 10 LUMA PROGRAMMABLE FILTER + SHARPNESS FILTER SATURATION CONTROL + ADD BURST + INTERPOLATOR 10 PROGRAMMABLE CHROMA FILTER 10 8 8 8 REAL-TIME CONTROL CIRCUIT SCRESET/RTC MODULATOR + HUE CONTROL 10 10 10 10 10-BIT DAC 10 10-BIT DAC 10 M U L T I P L E X E R Y U V 8 4:2:2 TO 4:4:4 INTER- POLATOR 10 10 SIN/COS DDS BLOCK DAC CONTROL BLOCK DAC CONTROL BLOCK 10-BIT DAC 10 10 10 10 10-BIT DAC 10 10-BIT DAC 10 M U L T I P L E X E R YUV TO RBG MATRIX + YUV LEVEL CONTROL BLOCK I2C MPU PORT HSYNC FIELD/ VSYNC BLANK TTX TTXREQ VAA RESET TELETEXT INSERTION BLOCK YCrCb TO YUV MATRIX CLOCK CSO_HSO VSO CLAMP SCLOCK SDATA ALSB VIDEO TIMING GENERATOR GND PAL NTSC The ADV7172/ADV7173 also supports both PAL and NTSC square pixel operation. The parts also incorporate WSS and CGMS-A data control generation. The ADV7172/ADV7173 is designed with four color controls (hue, contrast, brightness and saturation). All YUV formats (SMPTE, MII and Betacam) are supported in both PAL and NTSC. 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 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. HSO/CSO and VSO TTL outputs, synchronous to the analog output video, are also available. A programmable CLAMP output signal is also available to enable clamping in either the front or back porch of the video signal. A separate teletext port enables the user to directly input tele- text data during the vertical blanking interval. The ADV7172/ADV7173 modes are set up over a two wire serial bidirectional port (I 2C-Compatible) with two slave ad- dresses. Functionally the ADV7173 and ADV7172 are the same with the exception that the ADV7172 can output the Macrovi- sion anticopy algorithm. The ADV7172/ADV7173 is packaged in a 48-lead LQFP pack- age (1.4 mm thickness). 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 ADV7172/ ADV7173 supports PAL (B, D, G, H, I, N, M) and NTSC (with and without pedestal) standards. The Y data is then ma- nipulated by being scaled for contrast control and a setup level is added for brightness control. The Cr, Cb data is also scaled and saturation control is added. The appropriate Sync, Blank and Burst levels are then added to the YCrCb data. Macrovi- sion AntiTaping (ADV7172 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 fil- tered and scaled by three digital FIR Filters. The U and V Signals are modulated by the appropriate sub- carrier sine/cosine phases and a phase offset may be added onto the color subcarrier during active video to allow hue adjustment. The resulting U and V signals are then 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 appro- priate Sync and Blank levels. The YUV levels are also scaled to output the suitable SMPTE or Betacam levels. There are six DACs on the ADV7172/ADV7173. Three of these DACs are capable of providing 34.66 mA of current. The other three DACs provide 8.66 mA each. The six l0-bit DACs can be used to output: 1. Composite Video + RGB Video + LUMA + CHROMA. 2. Composite Video + YUV Video + LUMA + CHROMA. Alternatively, each DAC can be individually powered off if not required. A complete description of DAC output configurations is given in Appendix 8. Video output levels are illustrated in Appendix 6. (continued on page 11) |
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