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MAX7428 Datasheet(PDF) 14 Page - Maxim Integrated Products |
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MAX7428 Datasheet(HTML) 14 Page - Maxim Integrated Products |
14 / 21 page Standard Definition Video Reconstruction Filters and Buffers 14 ______________________________________________________________________________________ When processing composite video set the clamp level to +1V (CLEVEL = 0). Use the MAX7430 to process two synchronous composite signals simultaneously. Use the MAX7432 to process three synchronous composite sig- nals simultaneously. Y/C Video Filtering The MAX7430 is ideally suited for processing S-Video (Y/C) signals (Figure 10). Ensure that IN1_ filters the signal that contains the sync information (Y) since the clamping on IN2_ is internally controlled by the master channel (IN1_) sync. Set the clamp level for IN1_ to +1V (CLEVEL1 = 0) and set the clamp level for IN2_ to +1.5V (CLEVEL2 = 1). Use two MAX7428s for Y/C video filtering. Since only the Y signal contains the sync, a typical Y/C video-filtering application requires a master-slave configuration of the SYNCIO. The MAX7428 processing the Y signal should have SYNCIO configured as an output, which in turn dri- ves the SYNCIO of the second MAX7428, processing the C signal that has its SYNCIO configured as an input (Figure 11). Clamping level for the Y signal should be set for +1V (CLEVEL = 0), and clamping level for the C sig- nal should be set for +1.5V (CLEVEL = 1). Use the MAX7432 to filter one Y/C and one composite video sig- nal that are synchronous. Component Video (RGB or Y Pb Pr) Filtering Component video consists of three separate signals. Typically the three signals are separate red, green, and blue (RGB) signals or Y (luma) and two color difference signals: B-Y (Pb) which is blue minus luma and R-Y (Pr), which is red minus luma. Sync information is included with the Y signal of Y Pb Pr component video, or in the case of RGB, sync is usually carried on the G or on a separate H sync line. The MAX7432 is ideally suited for filtering component video signals. Ensure that the sync signal (Y for Y Pb Pr signals and usually G for RGB sig- nals) is filtered by IN1_ since IN2_ and IN3_ are inter- nally synced to IN1_. Set the clamp level for IN1_ to +1V (CLEVEL1 = 0) and set the clamp levels for IN2_ and IN3_ to +1.5V (CLEVEL2, 3 = 1) for Y Pb Pr filtering (Figure 12) and set all clamp levels to 1V (CLEVEL_ = 0) for RGB filtering (Figure 13). A Y Pb Pr component video-filter application requires three MAX7428s with SYNCIO master-slave configuration. The MAX7428 pro- cessing the Y signal has its SYNCIO configured as an output, which in turn drives the SYNCIO inputs of the other MAX7428s (Figure 14). For RGB video signal fil- tering with a separate horizontal sync signal, configure all MAX7428s for SYNCIO as an input (Figure 15). tWAIT tT tT t1 t1 tP t1 t1 t1 t0 AB C D tP tP READS 1ST BIT (LSB) A: µP WILL RELEASE BUS BY TIME A B: µP CAN START READING BIT AT TIME B C: µP HAS UNTIL TIME C TO FINISH READING BIT D: DEVICE WILL RELEASE BUS BY TIME D NOTE: TIME A, B, C, D ARE REFERENCED TO t0. READS 2ND BIT REPEAT TO READ 6 MORE BITS 0 OR 1 0 OR 1 t0 AB C D 0 OR 1 tO Figure 8. Read Timing Diagram DATA: 1***000 tWAIT tT t1 tT t1 t1 t1 t0 t0 t0 t0 t0 t0 LSB MSB Figure 9. Broadcast Timing Diagram |
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