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ATA5423-PLSW Datasheet(PDF) 15 Page - ATMEL Corporation

Part # ATA5423-PLSW
Description  UHF ASK/FSK Transceiver
PDF  100 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATA5423-PLSW Datasheet(HTML) 15 Page - ATMEL Corporation

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15
4841D–WIRE–10/07
ATA5423/ATA5425/ATA5428/ATA5429
Figure 3-3.
Narrow Band 3 dB Blocking Characteristic at 433.92 MHz
Figure 3-4.
Wide Band 3 dB Blocking Characteristic at 433.92 MHz
Figure 3-5 on page 16 shows the blocking measurement close to the received frequency to illus-
trate the selectivity and image rejection. This measurement was done 6 dB above the sensitivity
level with a useful signal of 433.92 MHz/FSK/20 Kbit/s/±16 kHz/ Manchester with a level of
–106 dBm + 6 dB = –100 dBm. The figure shows to which extent a continuous wave signal can
surpass –100 dBm until the BER is higher than 10
-3. For example, at 1 MHz the blocker can then
be 59 dB higher than –100 dBm which is –100 dBm + 59 dB = –41 dBm.
Table 3-6 on page 16 shows the blocking performance measured relative to –100 dBm for some
other frequencies. Note that sometimes the blocking is measured relative to the sensitivity level
(dBS) instead of the carrier (dBC).
70
50
60
40
20
30
-1
0
1
2
-5
-4
-3
-2
Distance of Interfering to Receiving Signal (MHz)
10
-10
0
34
5
80
60
70
50
30
40
20
-10
0
10
-10
0
10
20
-50
-40
-30
-20
Distance of Interfering to Receiving Signal (MHz)
30
40
50



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