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EVB71122C-433-C Datasheet(PDF) 9 Page - Melexis Microelectronic Systems |
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EVB71122C-433-C Datasheet(HTML) 9 Page - Melexis Microelectronic Systems |
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9 / 32 page  PR EL IM INA RY EVB71122 300 to 930MHz Receiver Evaluation Board Description 39012 71122 01 Page 9 of 32 EVB Description Rev. 001 Sept/06 2.2.2 Calculation of LO1 and IF1 frequency for High Frequency Bands Typical ISM band operating frequencies like 868.3 and 915MHz can be covered without changing the crystal nor the VCO inductor. Low-low injection should be used for the high frequency bands. First of all choose a PFD frequency fPFD according to below table. The R counter values are valid for a 10MHz crystal reference. The PFD frequency is given by fPFD = fRO /R. Injection Type fCH [kHz] fPFD [kHz] R l-l 20 16 625 l-l 25 20 500 l-l 50 40 250 l-l 100 80 125 l-l 250 200 50 l-l 500 400 25 The second step is to calculate the missing parameters fLO1, fIF1, Ntot, N and A. While the second IF (fIF2), the NLO2 divider ratio and the prescaler divider ratio P are bound to fIF2 = 2MHz, NLo2 = 4 (or 8) and P =32. ) f (f 1 N N f IF2 RF LO2 LO2 LO1 − + = 2MHz) (f 5 4 f RF LO1 − = (8) 1 N f N f f LO2 IF2 LO2 RF IF1 + + = 5 8MHz f f RF IF1 + = (9) Finally N and A can be calculated with formula (5). 2.2.3 Counter Setting Examples for SPI Mode To provide some examples, the following table shows some counter settings for the reception of the well- known ISM and SRD frequency bands. The channel spacing is assumed to be fCH = 100kHz. In below table all frequency units are in MHz. Inj fRF fIF1 fLO1 Ntot N P A fPFD R fREF fLO2 fIF2 h-h 300 97.3 397.3 2980 93 32 4 0.133 75 10 99.3 2 h-h 315 102.3 417.3 3130 97 32 26 0.133 75 10 104.3 2 h-h 434 142 576 4320 135 32 0 0.133 75 10 144 2 h-h 470 154 624 4680 146 32 8 0.133 75 10 156 2 l-l 850 171.6 678.4 8480 256 32 0 0.08 125 10 169.6 2 l-l 868 175.2 692.8 8660 270 32 20 0.08 125 10 173.2 2 l-l 915 184.6 730.4 9130 285 32 10 0.08 125 10 182.6 2 l-l 930 187.6 742.4 9280 290 32 0 0.08 125 10 185.6 2 |
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