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ADV7191 Datasheet(PDF) 12 Page - Analog Devices |
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ADV7191 Datasheet(HTML) 12 Page - Analog Devices |
12 / 69 page ADV7190/ADV7191 –12– REV. 0 Programmable gamma correction is also available. Figure 6 shows the response of different gamma values to a ramp signal. 250 200 150 100 50 0 300 SIGNAL OUTPUTS SIGNAL INPUT 0.5 GAMMA CORRECTION BLOCK OUTPUT TO A RAMP INPUT FOR VARIOUS GAMMA VALUES 0 50 100 150 200 250 LOCATION 0.3 1.5 1.8 Figure 6. Signal Input (Ramp) and Selectable Gamma Output Curves The on-board SSAF (Super Subalias Filter) with extended luminance frequency response and sharp stopband attenuation enables studio quality video playback on modern TVs, giving optimal horizontal line resolution. An additional sharpness control feature allows high-frequency enhancement on the lumi- nance signal. The device is driven by a 27 MHz clock. Data can be output at 27 MHz or 54 MHz (on-board PLL) when 4 oversampling is enabled. Also, the output filter requirements in 4 oversampling and 2 oversampling differ, as can be seen in Figure 7. –30dB 0dB 6.75MHz 13.5MHz 27.0MHz 40.5MHz 54.0MHz 2 FILTER REQUIREMENTS 4 FILTER REQUIREMENTS Figure 7. Output Filter Requirements in 4 × Oversampling Mode ENCODER CORE 2 I N T E R P O L A T I O N 6 D A C O U T P U T S 54MHz OUTPUT RATE ADV7190/ADV7191 PLL 54MHz MPEG2 PIXEL BUS 27MHz Figure 8. PLL and 4 × Oversampling Block Diagram The ADV7190/ADV7191 also supports both PAL and NTSC square pixel operation. In this case 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. An advanced power management circuit enables optimal control of power consumption in normal operating modes or sleep modes. 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 master mode. HSO/CSO and VSO TTL outputs are also available and are timed to the analog output video. A separate teletext port enables the user to directly input teletext data during the vertical blanking interval. The ADV7190/ADV7191 also incorporates WSS and CGMS-A data control generation and Macrovision Rev 7.1. The ADV7190/ADV7191 modes are set up over a 2-wire serial bidirectional port (I 2C-compatible) with two slave addresses, and the device is register-compatible with the ADV7172/ADV7173. The ADV7190ADV7191 is packaged in a 64-lead LQFP 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-656/601-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 ADV7190/ADV7191 supports PAL (B, D, G, H, I, N, M) and NTSC M, N (with and without Pedestal) and PAL60 stan- dards. Digital Noise Reduction can be applied to the Y signal. Programmable gamma correction can also be applied to the Y signal if required. The Y data can be manipulated for contrast control and a set-up level can be added for brightness control. The Cr, Cb data can be scaled to achieve color saturation control. All settings become effective at the start of the next field when double buffering is enabled. The appropriate sync, blank, and burst levels are added to the YCrCb data. Macrovision antitaping, (ADV7190 only) Closed- Captioning, and Teletext levels are also added to Y and the resultant data is interpolated to 54 MHz when 4 × Oversampling is enabled. 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 waveforms 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 added together to make up the Chrominance Signal. The Luma (Y) signal can be delayed by up to six clock cycles (at 27 MHz) and the Chroma signal can be delayed by up to eight clock cycles (at 27 MHz). The Luma and Chroma Signals are added together to make up the Composite Video Signal. All timing signals are controlled. The YCrCb data is also used to generate RGB data with appropri- ate sync and blank levels. The YUV levels are scaled to output the suitable SMPTE/EBU N10, MII, or Betacam levels. |
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