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MRF89XA
3.4.8
f dev SETTING IN RECEIVE MODE
EQUATION 3-13:
2 ? f dev
The effect of the f dev setting is different for FSK and
OOK modes:
β = ------------------- ≥ 2
BRVAL
3.4.8.1
FSK RX Mode
In FSK mode, the f dev setting as configured by
FDVAL<7:0> bits (FDEVREG<7:0>), sets sampling
frequencies on the receiver. The user should program
the right values to make it consistent with the frequency
deviation of the FSK signal that is received.
3.4.10 OOK DEMODULATOR
The OOK demodulator performs a comparison of the
RSSI output and a threshold value. Three different
threshold modes are available, which can be
programmed through the OOKTYP<1:0> bits
3.4.8.2
OOK RX Mode
(DMODREG<4:3>).
The frequency deviation f dev , as described previously,
sets the sampling rate of the RSSI block. It is therefore
necessary to set f dev to the recommended low-IF
frequency, IF2, of 100 kHz:
f dev = IF2 = 100 kHz
FDVAL<7:0> = 00000011
3.4.9 FSK DEMODULATOR
The FSK demodulator provides data polarity informa-
tion based on the relative phase of the input I and Q sig-
nals at the baseband. Its outputs can be fed to the Bit
Synchronizer to recover the timing information. The
user can use the raw, unsynchronized, output of the
FSK demodulator in Continuous mode.
The FSK demodulator of the MRF89XA operates effec-
tively for FSK signals with a modulation index greater
than or equal to two, as shown in Equation 3-13 .
The recommended mode of operation is the Peak
Threshold mode, as illustrated in Figure 3-11 .
In Peak Threshold mode, the comparison threshold
level is the peak value of the RSSI, reduced by 6 dB. In
the absence of an input signal or during the reception
of a logical ‘ 0 ’, the acquired peak value is decremented
by one based on the step value of the OOKTHSV<2:0>
bits (OOKCREG<7:5>) for every period value based on
OOKTHPV<2:0> bits (OOKCREG<4:2>).
When the RSSI output is null for a long time (for exam-
ple, after a long string of zeros is received, or if no
transmitter is present), the peak threshold level will
continue falling until it reaches the “Floor Threshold”
that is programmed through the FTOVAL<7:0> bits
(FLTHREG<7:0>).
The default settings of the OOK demodulator lead to
the performance stated in Section 5.0, Electrical
Characteristics .
FIGURE 3-11:
RSSI
(dB)
OOK DEMODULATOR OVERVIEW
Zoom
''Peak -6 dB'' Threshold
''Floor'' threshold defined by
FTOVAL<7:0>
Noise floor of
receiver
Time
Decay in dB as defined in
OOKTHSV<2;0>
Period as defined in
OOKTHPV<2:0>
Fixed 6dB difference
DS70622C-page 66
Preliminary
? 2010–2011 Microchip Technology Inc.
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