ATA5428-PLSW datasheet(12/100 Pages) ATMEL

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4841D–WIRE–10/07

ATA5423/ATA5425/ATA5428/ATA5429

3.3

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 3-2 shows the typical

sensitivity at 433.92 MHz/FSK/20 Kbit/s/

±16 kHz/Manchester versus the frequency offset

between transmitter and receiver with T

amb = –40°C, +25°C and +105°C and supply voltage

VS1 = VS2 = 2.4V, 3.0V and 3.6V.

Table 3-2.

Input Matching to 50

Ω

fRF/MHz

C1/pF

L1/nH

QL1

315

2.4

345

1.8

433.92

1.8

868.3

1.2

6.8

915

1.3

5.6

Table 3-3.

Measured Sensitivity FSK, ±16 kHz, Manchester, dBm, BER = 10–3

Frequency

BR_Range_0

1.0 Kbit/s

BR_Range_0

2.4 Kbit/s

BR_Range_1

5.0 Kbit/s

BR_Range_2

10 Kbit/s

BR_Range_3

20 Kbit/s

315 MHz

–110.0 dBm

–110.5 dBm

–109.0 dBm

–108.0 dBm

–107.0 dBm

345 MHz

–109.5 dBm

–110.5 dBm

–109.0 dBm

–107.5 dBm

–107.0 dBm

433.92 MHz

–109.0 dBm

–109.5 dBm

–108.0 dBm

–107.0 dBm

–106.0 dBm

868.3 MHz

–106.0 dBm

–106.5 dBm

–105.5 dBm

–104.0 dBm

–103.5 dBm

915 MHz

–105.5 dBm

–106.0 dBm

–105.0 dBm

–103.5 dBm

–103.0 dBm

Table 3-4.

Measured Sensitivity 100% ASK, Manchester, dBm, BER = 10

–3

RF Frequency

BR_Range_0

1.0 Kbit/s

BR_Range_0

2.4 Kbit/s

BR_Range_1

5.0 Kbit/s

BR_Range_2

10 Kbit/s

315 MHz

–117.0 dBm

–117.5 dBm

–115.0 dBm

–113.5 dBm

345 MHz

–117.0 dBm

–117.5 dBm

–115.0 dBm

–113.0 dBm

433.92 MHz

–116.0 dBm

–116.5 dBm

–114.0 dBm

–112.5 dBm

868.3 MHz

–112.5 dBm

–113.0 dBm

–111.5 dBm

–109.5 dBm

915 MHz

–112.5 dBm

–113.0 dBm

–111.0 dBm

–109.0 dBm

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