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TDA7421 数据表(PDF) 31 Page - STMicroelectronics |
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TDA7421 数据表(HTML) 31 Page - STMicroelectronics |
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31 / 38 page  FM DEMODULATOR ADJUSTMENT (subaddress 06H) MSB LSB FUNCTION SDD DEM6 DEM5 DEM4 DEM3 DEM2 DEM1 DEM0 SD disable demadj MSB demadj demadj demadj demadj demadj demadj LSB ADJUSTMENT CAPACITOR 0000 000 0 0000 001 Cdemod 0000 010 2Cdemod 0000 100 4Cdemod 0001 000 8Cdemod 0010 000 16Cdemod 0100 000 32Cdemod 1000 000 64Cdemod 1111 111 127Cdemod all combinations allowed SD DISABLE 0 SD ENABLED 1 SD DISABLED (High impedance output) FM IF BUFFERS (subaddress 07H) MSB LSB FUNCTION FBL3 FBL2 FBL1 FBL0 FBH3 FBH2 FBH1 FBH0 buff2 gain MSB buff2 gain buff2 gain buff2 gain LSB buff1 gain MSB buff1 gain MSB buff1 gain buff1 gain LSB BUFFER 1 GAIN (dB) 0 000 19.5 0 001 15.5 0 010 16.5 0 100 17.5 1 000 18.5 all else not allowed BUFFER 2 GAIN (dB) 0 000 8 0 001 4 0 010 5 0 100 6 1 000 7 all else not allowed TDA7421 31/38 |
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