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SX1211
WIRELESS & SENSING
450
400
350
300
250
200
150
100
50
0
Butterworth Filter's BW, FSK
Actual
BW
Theoretical
BW
0
2
4
6
8
10
12
14
16
Val (RXParam_ButterFilt) [d]
Figure 18: Butterworth Filter's Actual BW
Table 37 suggests filter settings in FSK mode, along with the corresponding passive filter bandwidth and the
accepted tolerance on the crystal reference.
3.4.6. Channel Filters Setting in OOK Mode
The center frequency, fo, is always set to 100kHz. The following chart shows the receiver bandwidth when
changing RXParam_Butterfilt bits, whilst the polyphase filter is activated.
450
400
350
300
250
200
150
100
50
0
Polyphase Filter's BW, OOK
Actual
BW
Theoretical
BW
0
2
4
6 8 10
12
14
16
Val (RXParam_ButterFilt [d]
RXParam_PolypFilt="0011"
Figure 19: Polyphase Filter's Actual BW
Table 38 suggests a few filter settings in OOK mode, along with the corresponding passive filter bandwidth and the
accepted tolerance on the crystal reference.
3.4.7. RSSI
After filtering, the In-phase and Quadrature signals are amplified by a chain of 11 amplifiers, each with 6dB gain.
The outputs of these amplifiers are used to evaluate the Received Signal Strength (RSSI).
3.4.7.1. Resolution and Accuracy
Whilst the RSSI resolution is 0.5 dB, the absolute accuracy is not expected to be better than +/- 3dB due to process
and external component variation. Higher accuracy whilst performing absolute RSSI measurements will require
additional calibration.
3.4.7.2. Acquisition Time
Rev 8 – February 2013
Page 26 of 92
www.semtech.com
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