XE1205
6.2
HARDWARE SETTINGS
When operating at 304.7 kbit/s, the loop filter must be modified. Typical recommended component values are provided
below :
Name
CL1
CL2
RL1
434 MHz
3.3 nF
220 pF
1.5 k Ω
869 MHz
10 nF
150 pF
1.5 k Ω
915 MHz
10 nF
150 pF
1.5 k Ω
Tolerance
± 5%
± 5%
± 5%
Table 15: PLL Loop Filter Bill of Material for 304.7 kbit/s
6.3
OPERATION
Like for any other configuration, in order to avoid crystal misalignment issues and get the best performance it is
recommended to perform an AFC with maximum Rx filter bandwidth before using the 304.7 kbit/s with the settings
described above.
AFC operation may need to be performed at a lower datarate to cover worst case crystal, process and temperature
variations.
Please note that all features including FIFO are available at bit rates up to 304.7 kbit/s.
6.4
?
?
TYPICAL PERFORMANCE
Sensitivity@0.1%: -102 dBm in mode A and -90 dBm in mode B.
ACR@1MHz offset, single tone: 25 dBc.
? Semtech 2008
23
www.semtech.com
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