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SX1211
WIRELESS & SENSING
To ensure correct operation of the Bit Synchronizer, the following conditions have to be satisfied:
A preamble (0x55 or 0xAA) of three bytes is required for synchronization, the longer the synchronization the
better the packet success rate
The subsequent payload bit stream must have at least one transition from '0' to '1' or '1' to'0 every 16 bits
during data transmission
The bit rate matching between the transmitter and the receiver must be better than 6.5%.
3.4.12. Alternative Settings
Bit Synchronizer and Active channel filter settings are a function of the reference oscillator crystal frequency, F XTAL .
Settings other than those programmable with a 12.8 MHz crystal can be obtained by selection of the correct
reference oscillator frequency. Please contact your local Semtech representative for further details.
3.4.13. Data Output
After OOK or FSK demodulation, the baseband signal is made available to the user on pin 20, DATA, when
Continuous mode is selected.
In Buffered and Packet modes, the data is retrieved from the FIFO through the SPI interface.
Rev 8 – February 2013
Page 32 of 92
www.semtech.com
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