Data Sheet

LJ1269HC
Rev1.0 Page 31 Web: www.ljelect.com
signed result is loaded in FeiValue in RegFei, in 2‟s complement format. The time required for an FEI evaluation is 4 times the
bit period.
To ensure a proper behavior of the FEI:
 The operation must be done during the reception of preamble
 The sum of the frequency offset and the 20 dB signal bandwidth must be lower than the base band filter bandwidth
The 20 dB bandwidth of the signal can be evaluated as follows (double-side bandwidth):
The frequency error, in Hz, can be calculated with the following formula:
Figure 13. FEI Process
Sub GHz FSK/OOK Transceiver Module DATASHEET
BW20dB=2×{FDEV+
𝐵𝑅
2
}
FEI = FSTEP×FeiValue