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MRF89XA Arkusz danych(PDF) 64 Page - Microchip Technology

Numer części MRF89XA
Szczegółowy opis  Ultra Low-Power, Integrated ISM BandSub-GHz Transceiver
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Producent  MICROCHIP [Microchip Technology]
Strona internetowa  http://www.microchip.com
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MRF89XA Arkusz danych(HTML) 64 Page - Microchip Technology

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MRF89XA
DS70000622D-page 64
Preliminary
 2010-2017 Microchip Technology Inc.
3.4.6
CHANNEL FILTERS SETTING IN
OOK MODE
The center frequency, fo, is set to 100 kHz by default.
The chart in Figure 3-8 illustrates the receiver
bandwidth
when
the
BUTFILV<3:0>
bits
(FILCREG<3:0>) are changed when the polyphase
filter is activated.
Table A-2 suggests a few filter settings in OOK mode
along with the corresponding passive filter bandwidth,
and Table 4-2 specifies the accepted tolerance on the
crystal reference.
3.4.7
RECEIVED SIGNAL STRENGTH
(RSSI)
After filtering, the In-phase and Quadrature signals are
amplified by a chain of 11 amplifiers, each with 6 dB
gain. The outputs of these amplifiers are used to
evaluate the RSSI.
3.4.7.1
Resolution and Accuracy
When the RSSI resolution is 0.5 dB, the absolute
accuracy is not expected to be better than ±3 dB due to
process and external component variation. Higher
accuracy
while
performing
absolute
RSSI
measurements requires additional calibration.
FIGURE 3-8:
ACTUAL BW OF POLYPHASE FILTER
3.4.7.2
Acquisition Time
In OOK mode, the RSSI evaluates the signal strength
by sampling I(t) and Q(t) signals 16 times in each
period of the chosen IF2 frequency (refer to
Section 2.10.1, Receiver Architecture). In FSK
mode, the signals are sampled 16 times in each fdev
period, fdev being the frequency deviation of the
companion transmitter. An average is then performed
over a sliding window of 16 samples. Therefore, the
RSSI output register RSTSREG (RSSIVAL<7:0>) is
updated 16 times in each fdev or IF2 period.
The following settings are recommended:
• FSK Mode: Ensure that the fdev parameter (as
described in the FDEVREG register (Register 2-3)
through the FDVAL<7:0> bits)) remains consistent
with the actual frequency deviation of the
companion transmitter.
• OOK reception: Ensure that the fdev parameter (as
described in the FDEVREG register (Register 2-3)
through the FDVAL<7:0> bits)) is equal to the
frequency of the I(t) and Q(t) signals (that is, the
second Intermediate Frequency, IF2, of the
receiver). Note that, this IF2 equals fo, the center
frequency of the polyphase filter.
Polyphase Filter's BW, OOK
0
50
100
150
200
250
300
350
400
450
04
8
10
12
14
Val (BUTFILV<3:0>) [d]
POLCFV<3:0> = 0011
16
Actual
BW
Theoretical
BW
26


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