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ATA5745 Datasheet(PDF) 7 Page - ATMEL Corporation |
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ATA5745 Datasheet(HTML) 7 Page - ATMEL Corporation |
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7 / 43 page  7 4596A–RKE–05/06 ATA5745/ATA5746 [Preliminary] Conditions for the sensitivity measurement: The given sensitivity values are valid for Manchester-modulated signals. For the sensitivity mea- surement the distance from edge to edge must be evaluated. As can be seen in Figure 6-1 on page 24, in a Manchester-modulated data stream, the time segments T EE and 2 × TEE occur. To reach the specified sensitivity for the evaluation of T EE and 2 × TEE in the data stream, the following limits should be used (T EE min, TEE max, 2 × TEE min, 2 × TEE max). 2.3 Sensitivity Versus Supply Voltage, Temperature and Frequency Offset To calculate the behavior of a transmission system, it is important to know the reduction of the sensitivity due to several influences. The most important are frequency offset due to crystal oscillator (XTO) and crystal frequency (XTAL) errors, temperature and supply voltage depen- dency of the noise figure, and IF-filter bandwidth of the receiver. Figure 2-2 and Figure 2-3 on page 8 show the typical sensitivity at 315 MHz, ASK, 2.4 Kbits/s and 9.6 Kbits/s, Manchester, Figure 2-4 and Figure 2-5 on page 9 show a typical sensitivity at 315 MHz, FSK, 2.4 Kbits/s and 9.6 Kbits/s, ±38 kHz, Manchester versus the frequency offset between transmitter and receiver at T amb = –40°C, +25°C, and +105°C and supply voltage VS = VS3V_AVCC = VS5V = 2.7V, 3.0V and 3.3V. Table 2-3. Measured Typical Sensitivity FSK, ±38 kHz, Manchester, BER = 10–3 RF Frequency BR_Range_0 1.0 Kbit/s BR_Range_0 2.5 Kbits/s BR_Range_1 5 Kbits/s BR_Range_2 10 Kbits/s BR_Range_3 10 Kbits/s BR_Range_3 20 Kbits/s 315 MHz –108 dBm –108 dBm –107 dBm –105 dBm –104 dBm –104 dBm 433.92 MHz –107 dBm –107 dBm –106 dBm –104 dBm –103 dBm –103 dBm Table 2-4. Measured Typical Sensitivity 100% ASK, Manchester, BER = 10–3 RF Frequency BR_Range_0 1.0 Kbit/s BR_Range_0 2.5 Kbits/s BR_Range_1 5 Kbits/s BR_Range_2 10 Kbits/s BR_Range_3 10 Kbits/s 315 MHz –114 dBm –114 dBm –113 dBm –111 dBm –109 dBm 433.92 MHz –113 dBm –113 dBm –112 dBm –110 dBm –108 dBm Table 2-5. Limits for Sensitivity Measurements Bit Rate T EE Min T EE Typ T EE Max 2 × T EE Min 2 × T EE Typ 2 × T EE Max 1.0 Kbit/s 260 µs 500 µs 790 µs 800 µs 1000 µs 1340 µs 2.4 Kbits/s 110 µs 208 µs 310 µs 320 µs 416 µs 525 µs 5.0 Kbits/s 55 µs 100 µs 155 µs 160 µs 200 µs 260 µs 9.6 Kbits/s 27 µs 52 µs 78 µs 81 µs 104 µs 131 µs |
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