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SX1231
BW 20 dB = 2 × ? F DEV + ------- ?
WIRELESS & SENSING PRODUCTS
The 20 dB bandwidth of the signal can be evaluated as follows (double-side bandwidth):
BR
? 2 ?
The frequency error, in Hz, can be calculated with the following formula:
FEI = F STEP × FeiValue
SX1231 in Rx mode
Preamble-modulated input signal
Signal level > Sensitivity
Set FeiStart
=1
DATASHEET
FeiDone
No
=1
Yes
Read
FeiValue
Figure 14. FEI Process
3.5.15. Automatic Frequency Correction
The AFC is based on the FEI block, and therefore the same input signal and receiver setting conditions apply. When the
AFC procedure is done, AfcValue is directly subtracted to the register that defines the frequency of operation of the chip,
F RF . The AFC can be launched:
?
?
Each time the receiver is enabled, if AfcAutoOn = 1
Upon user request, by setting bit AfcStart in RegAfcFei , if AfcAutoOn = 0
Rev. 7 - June 2013
Page 34
www.semtech.com
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