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SX1233 Datasheet(PDF) 28 Page - Semtech Corporation |
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SX1233 Datasheet(HTML) 28 Page - Semtech Corporation |
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28 / 81 page  www.semtech.com Page 28 SX1233 ADVANCED COMMUNICATIONS & SENSING DATASHEET Rev 3.April 2010 Figure 8. Cordic Extraction 3.5.10. FSK Demodulator The FSK demodulator of the SX1233 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: The output of the FSK demodulator can be fed to the Bit Synchronizer (described in section 3.5.12), to provide the companion processor with a synchronous data stream in Continuous mode. 3.5.11. 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 9: Figure 9. OOK Peak Demodulator Description I(t) Q(t) Real-time Phase Real-time Magnitude 0.5 β ≤ 2 FDEV × BR ---------------------- 10 ≤ = Zoom Period as defined in OokPeakThreshDec Decay in dB as defined in OokPeakThreshStep Fixed 6dB difference RSSI [dBm] Noise floor of receiver ‘’Floor’’ threshold defined by OokFixedThresh Time ‘’Peak -6dB’’ Threshold Zoom |
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