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STV82X6 データシート(PDF) 14 Page - STMicroelectronics |
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STV82X6 データシート(HTML) 14 Page - STMicroelectronics |
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14 / 95 page  Demodulator Block STV82x6 14/95 Note: D1 and D2 define the two channels encoded in the NICAM packet. 2.2 System Clock The System Clock integrates a low-jitter PLL clock and can be fully reprogrammed via registers PLL_DIV, PLL_MD, PLL_PEH and PLL_PEL. The default values are designed for a standard 27-MHz quartz crystal frequency, which is the recommended frequency for minimizing potential RF interference in the application. This sinusoidal clock frequency, and any harmonic products, remains outside the TV picture and sound IF (PIF/SIF) and Band-I RF passbands and has been selected in order to reduce the risk of potential interference to the TV IF and RF system. However, if required, the PLL clock can be re-programmed for an other quartz crystal frequency within a range between 23 and 30 MHz. Note: A change in the crystal frequency is compatible with other default I²C programming values, including those of the built-in Automatic Standard Recognition System. Table 5: NICAM System Transmission Modes System Mode NICAM_STAT[ 4:1] NICAM De-emphasis CH_LANG[1:0] Sound Selection Sound Backup NICAM Stereo 1000 J17 XX NICAM Stereo FM/AM Mono NICAM Dual Mono (CH1 = A, CH2 = B) 1010 J17 01 NICAM Mono A FM/AM Mono 10 NICAM Mono B Mute NICAM Mono+Data (D1 = A, D2 = Data) 1001 J17 XX NICAM Mono A FM/AM Mono NICAM Data 1011 J17 XX FM/AM Mono X NICAM Stereo (no backup) 0000 J17 01 FM/AM Mono A X 00 NICAM Stereo Mute NICAM Dual Mono (no backup) (D1 = B, D2 = C) 0010 J17 01 FM/AM Mono A X 10 NICAM Mono B Mute 11 NICAM Mono C NICAM Mono+Data (no backup) (D1 = B, D2 = Data) 0001 J17 01 FM/AM Mono A X 10 NICAM Mono B Mute NICAM undefined (no backup) X1XX J17 XX FM/AM Mono X |
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