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ATA8203P3-TKQY Datasheet(PDF) 9 Page - ATMEL Corporation |
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ATA8203P3-TKQY Datasheet(HTML) 9 Page - ATMEL Corporation |
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9 / 46 page  9 9121B–INDCO–04/09 ATA8203/ATA8204/ATA8205 5. Receiving Characteristics The RF receiver ATA8203/ATA8204/ATA8205 can be operated with and without a SAW front-end filter. In a typical automotive application, a SAW filter is used to achieve better selectiv- ity and large signal capability. The receiving frequency response without a SAW front-end filter is illustrated in Figure 5-1 “Narrow Band Receiving Frequency Response ATA8204”. This example relates to ASK mode. FSK mode exhibits a similar behavior. The plots are printed relatively to the maximum sensitivity. If a SAW filter is used, an insertion loss of about 3 dB must be consid- ered, but the overall selectivity is much better. When designing the system in terms of receiving bandwidth, the LO deviation must be consid- ered as it also determines the IF center frequency. The total LO deviation is calculated, to be the sum of the deviation of the crystal and the XTO deviation of the ATA8203/ATA8204/ATA8205. Low-cost crystals are specified to be within ±90 ppm over tolerance, temperature, and aging. The XTO deviation of the ATA8203/ATA8204/ATA8205 is an additional deviation due to the XTO circuit. This deviation is specified to be ±10 ppm worst case for a crystal with CM = 7 fF. If a crystal of ±90 ppm is used, the total deviation is ±100 ppm in that case. Note that the receiving bandwidth and the IF-filter bandwidth are equivalent in ASK mode but not in FSK mode. Figure 5-1. Narrow Band Receiving Frequency Response ATA8204 10 0 -10 -20 -30 -40 -50 -60 -70 5.5V -40 ˚C 4.5V -40 ˚C 5V 25 ˚C 5.5V 25 ˚C 4.5V 25 ˚C 5V -40 ˚C 430 431 432 433 (MHz) Image Rejection versus RF Frequency 434 435 436 437 438 |
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