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ADV7341 数据表(PDF) 57 Page - Analog Devices |
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ADV7341 数据表(HTML) 57 Page - Analog Devices |
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57 / 108 page  Data Sheet ADV7340/ADV7341 Rev. C | Page 57 of 108 Figure 60. Square Pixel Mode EAV/SAV Embedded Timing Figure 61. Square Pixel Mode Active Pixel Timing FILTERS Table 43 shows an overview of the programmable filters available on the ADV7340/ADV7341. Table 43. Selectable Filters Filter Subaddress SD Luma LPF NTSC 0x80 SD Luma LPF PAL 0x80 SD Luma Notch NTSC 0x80 SD Luma Notch PAL 0x80 SD Luma SSAF 0x80 SD Luma CIF 0x80 SD Luma QCIF 0x80 SD Chroma 0.65 MHz 0x80 SD Chroma 1.0 MHz 0x80 SD Chroma 1.3 MHz 0x80 SD Chroma 2.0 MHz 0x80 SD Chroma 3.0 MHz 0x80 SD Chroma CIF 0x80 SD Chroma QCIF 0x80 SD PrPb SSAF 0x82 ED/HD Chroma Input 0x33 ED/HD Sinc Compensation Filter 0x33 ED/HD Chroma SSAF 0x33 SD Internal Filter Response Subaddress 0x80, Bits[7:2]; Subaddress 0x82, Bit 0 The Y filter supports several different frequency responses, including two low-pass responses, two notch responses, an extended (SSAF) response with or without gain boost attenuation, a CIF response, and a QCIF response. The PrPb filter supports several different frequency responses, including six low-pass responses, a CIF response, and a QCIF response, as shown in Figure 38 and Figure 39. If SD SSAF gain is enabled (Subaddress 0x87, Bit 4), there are 13 response options in the −4 dB to +4 dB range. The desired response can be programmed using Subaddress 0xA2. The variation in frequency responses is shown in Figure 35 to Figure 37. In addition to the chroma filters listed in Table 43, the ADV7340/ ADV7341 contain an SSAF filter that is specifically designed for the color difference component outputs, Pr and Pb. This filter has a cutoff frequency of ~2.7 MHz and a gain of –40 dB at 3.8 MHz (see Figure 62). This filter can be controlled with Subaddress 0x82, Bit 0. Y C r Y F F 0 0 0 0 X Y 8 0 1 0 8 0 1 0 F F 0 0 F F A B A B A B 8 0 1 0 8 0 1 0 F F 0 0 0 0 X Y C b Y C r C b Y C b Y C r EAV CODE SAV CODE ANCILLARY DATA (HANC) 4 CLOCK 4 CLOCK 272 CLOCK 1280 CLOCK 4 CLOCK 4 CLOCK 344 CLOCK 1536 CLOCK END OF ACTIVE VIDEO LINE START OF ACTIVE VIDEO LINE ANALOG VIDEO INPUT PIXELS NTSC/PAL M SYSTEM (525 LINES/60Hz) PAL SYSTEM (625 LINES/50Hz) Y FIELD PIXEL DATA PAL = 308 CLOCK CYCLES NTSC = 236 CLOCK CYCLES Cb Y Cr Y HSYNC |
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