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ATA5760 Datasheet(PDF) 5 Page - ATMEL Corporation |
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ATA5760 Datasheet(HTML) 5 Page - ATMEL Corporation |
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5 / 41 page  5 4896D–RKE–08/08 ATA5760/ATA5761 The nominal frequency f LO is determined by the RF input frequency fRF and the IF frequency fIF using the following formula (low side injection): f LO = fRF - fIF To determine f LO, the construction of the IF filter must be considered at this point. The nominal IF frequency is f IF = 950 kHz. To achieve a good accuracy of the filter corner frequencies, the filter is tuned by the crystal frequency f XTO. This means that there is a fixed relation between fIF and f LO. f IF =fLO/915 for BIF = 600 kHz f IF =fLO/878 for BIF = 300 kHz The relation is designed to achieve the nominal IF frequency of f IF = 950 kHz for the 868.3 MHz and BIF = 600 kHz version, f IF = 989 kHz for the 868.3 MHz and BIF = 300 kHz version and for the 915 MHz version an IF frequency of f IF = 1.0 MHz results. The RF input either from an antenna or from an RF generator must be transformed to the RF input pin LNA_IN. The input impedance of that pin is provided in the electrical parameters. The parasitic board inductances and capacitances influence the input matching. The RF receiver ATA5760/ATA5761 exhibits its highest sensitivity if the LNA is power matched. This makes the matching to an SAW filter as well as to 50 Ω or an antenna easier. Figure 14-1 on page 30 shows a typical input matching network for f RF = 868.3 MHz to 50Ω. Fig- ure 14-2 on page 30 illustrates an according input matching for 868.3 MHz to an SAW. The input matching network shown in Figure 14-1 on page 30 is the reference network for the parameters given in the electrical characteristics. |
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