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U4255BM-MFN Datasheet(PDF) 9 Page - ATMEL Corporation |
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U4255BM-MFN Datasheet(HTML) 9 Page - ATMEL Corporation |
9 / 32 page 9 U4255BM-M 4519C–AUDR–07/02 Table 14. FM Band Filter Center Frequency Correction Integrated FM Band Filter For FM reception a band filter with variable bandwidth is integrated in front of the demodulator to provide channel selectivity on the 2nd IF. The bandwidth of this filter can be adjusted by Bit 0 to 3 (see Table 15) to be suitable for the present receiving condi- tion. In WB mode, the bandwidth of the integrated filter is shifted to lower bandwidth values, while the necessary channel selectivity is achieved by an external ceramic filter. The center frequency of the integrated FM band filter can be adjusted by means of Bit 14 to 17 (Bit 4 set to 1). The field strength after the integrated FM band filter that is available at Pin 20 (Bit55 = 1) can be used for this purpose. Table 15. Bandwidth of the Integrated FM Band Filter. IF Correction Bit 17 Bit 16 Bit 15 Bit 14 - 0 kHz 000 0 - 6.25 kHz 000 1 - 12.50 kHz 0 0 1 0 - 18.75 kHz 0 0 1 1 - 25.00 kHz 0 1 0 0 - 31.25 kHz 0 1 0 1 - 37.50 kHz 0 1 1 0 - 43.75 kHz 0 1 1 1 + 0 kHz (default) 1 0 0 0 + 6.25 kHz 100 1 + 12.50 kHz 101 0 + 18.75 kHz 101 1 + 25.00 kHz 110 0 + 31.25 kHz 110 1 + 37.50 kHz 111 0 + 43.75 kHz 111 1 IF Bandwidth Bit 3 Bit 2 Bit 1 Bit 0 200 kHz 0 0 0 0 190 kHz 0 0 0 1 180 kHz 0 0 1 0 170 kHz 0 0 1 1 160 kHz 0 1 0 0 150 kHz 0 1 0 1 140 kHz 0 1 1 0 130 kHz 0 1 1 1 120 kHz 1 0 0 0 110 kHz 1 0 0 1 100 kHz 1 0 1 0 90 kHz 1 0 1 1 80 kHz 1 1 0 0 70 kHz 1 1 0 1 60 kHz 1 1 1 0 50 kHz 1 1 1 1 |
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