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ATA3742P3-TGSY Datasheet(PDF) 8 Page - ATMEL Corporation |
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ATA3742P3-TGSY Datasheet(HTML) 8 Page - ATMEL Corporation |
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8 / 34 page  8 4900B–RKE–11/07 ATA3742 Figure 4-1. Temperature Compensation of V RSSI Figure 4-2. RSSI Characteristic If R Sense is connected to VS, the receiver operates at a lower sensitivity. The reduced sensitivity is defined by the value of R Sense, the maximum sensitivity by the signal-to-noise ratio of the LNA input. The reduced sensitivity is dependent on the signal strength at the output of the RSSI amplifier. Since different RF input networks may exhibit slightly different values for the LNA gain, the sen- sitivity values given in the electrical characteristics refer to a specific input matching. This matching is illustrated in Figure 3-3 on page 6 and exhibits the best possible sensitivity. VRSSI RSSI ATA3742 I ~ Ig(VLNA_IN) I 50 k Ω 47 k Ω Bmin = 60 180 k Ω VRSSI_temp_comp. max min 1.6 1.5 1.4 1.2 1.0 0.9 0.8 0.7 0.6 0.5 -110 -100 -90 -70 -50 -60 -80 1.1 1.3 PREF (dBm) -40 °C 25 °C 105 °C |
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