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SX1231
WIRELESS & SENSING PRODUCTS
DATASHEET
2 × F DEV
0.5 ≤ β = ---------------------- ≤ 10
3.5.11. FSK Demodulator
The FSK demodulator of the SX1231 is designed to demodulate FSK, GFSK, MSK and GMSK modulated signals. It is
most efficient when the modulation index of the signal is greater than 0.5 and below 10:
BR
The output of the FSK demodulator can be fed to the Bit Synchronizer (described in section 3.5.13), to provide the
companion processor with a synchronous data stream in Continuous mode.
3.5.12. OOK Demodulator
The OOK demodulator performs a comparison of the RSSI output and a threshold value. Three different threshold modes
are available, configured through bits OokThreshType in RegOokPeak .
The recommended mode of operation is the "Peak" threshold mode, illustrated in Figure 11:
RSSI
[dBm]
‘’Peak -6dB’’ Threshold
‘’Floor’’ threshold defined by
OokFixedThresh
Noise floor of
receiver
Time
Zoom
Decay in dB as defined in
OokPeakThreshStep
Fixed 6dB difference
Period as defined in
OokPeakThreshDec
Figure 11. OOK Peak Demodulator Description
In peak threshold mode the comparison threshold level is the peak value of the RSSI, reduced by 6dB. In the absence of
an input signal, or during the reception of a logical "0", the acquired peak value is decremented by one
OokPeakThreshStep every OokPeakThreshDec period.
When the RSSI output is null for a long time (for instance after a long string of "0" received, or if no transmitter is present),
the peak threshold level will continue falling until it reaches the "Floor Threshold", programmed in OokFixedThresh .
The default settings of the OOK demodulator lead to the performance stated in the electrical specification. However, in
applications in which sudden signal drops are awaited during a reception, the three parameters should be optimized
accordingly.
Rev. 7 - June 2013
Page 31
www.semtech.com
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