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MRF89XA 数据表(PDF) 63 Page - Microchip Technology |
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MRF89XA 数据表(HTML) 63 Page - Microchip Technology |
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63 / 140 page  2010-2017 Microchip Technology Inc. Preliminary DS70000622D-page 63 MRF89XA The POLCFV<3:0> bits (PFCREG<7:4>) set fo, which is the center frequency of the polyphase filter when activated. The fo should always be chosen to be equal to the low Intermediate Frequency of the receiver (IF2). Because low IF frequency of the OOK receiver denoted by IF2 can always be replaced by fo for any calculations or monitoring purposes. The following setting is recommended: fo = 100 kHz POLCFV<3:0> = 0011. The value stored as BUTFILV<3:0> bits (FILCREG<3:0>) determines fc, the filter cut-off frequency. Therefore, fc should be set according to Equation 3-12. EQUATION 3-12: Again, fc, as a function of the BUTFILV<3:0> bits, is described in Section 3.4.6, Channel Filters Setting in OOK Mode. 3.4.5 CHANNEL FILTERS SETTING IN FSK MODE The fc, the 3 dB cut-off frequency of the Butterworth fil- ter used in FSK reception, is programmed through the BUTFILV<3:0> bits (FILCREG<3:0>). However, the entire receiver chain influences this cut-off frequency. The channel select and resultant filter bandwidths are illustrated in Figure 3-7. Table 4-2 suggests filter settings in FSK mode along with the corresponding passive filter bandwidth and the accepted tolerance on the crystal reference. FIGURE 3-7: ACTUAL BW OF BUTTERWORTH FILTER 2 fc fo – BW 99%,ook LOdrifts + Where, fc is the cut-off frequency fo is the center frequency Butterworth Filter BW, FSK 0 50 100 150 200 250 300 350 400 450 06 8 10 12 14 Val BUTFILV<3:0> [d] 16 Actual BW Theoretical BW 24 |
类似零件编号 - MRF89XA |
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类似说明 - MRF89XA |
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