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TDA7421 数据表(PDF) 24 Page - STMicroelectronics |
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TDA7421 数据表(HTML) 24 Page - STMicroelectronics |
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24 / 38 page ![]() IF COUNTER REFERENCE CONTROL 2 (MSB) AND IF COUNTER MODE SELECT MSB LSB FUNCTION D7 D6 D5 D4 D3 D2 D1 D0 0000 000 0 MSB = 0 0000 000 1 MSB = 256 0000 001 0 MSB = 512 all combinations allowed • • • 1 1 1 1 0 1 MSB = 15616 1 1 1 1 1 0 MSB = 15872 1 1 1 1 1 1 MSB = 16128 0 0 NOT USED IN APPLICATION MODE 0 1 IF counter FM mode 1 0 IF counter AM mode 1 1 not used IFCM1 IFCM0 IRC13 IRC12 IRC11 IRC10 IRC9 IRC8 Bit name Subaddress = 07H fosc/ftim = LSB + MSB + 1 IF COUNTER CONTROL 1 MSB LSB FUNCTION D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 don’t use 0 0 1 don’t use 0 1 0 don’t use 0 1 1 EW delta f = ±6.25KHz (FM); ±1KHz (AM) 1 0 0 EW delta f = ±12.5KHz (FM); ±2KHz (AM) 1 0 1 EW delta f = ±25KHz (FM); ±4KHz (AM) 1 1 0 EW delta f = ±50KHz (FM); ±8KHz (AM) 1 1 1 EW delta f = ±100KHz (FM); ±16KHz (AM) 0 IF counter disabled / stand by 1 IF counter enabled IFENA EW2 EW1 EW0 Bit name Subaddress = 08H TDA7421 24/38 |
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