RFM69W Datasheet, PDF (21/78 Pages) List of Unclassifed Manufacturers – ISM TRANSCEIVER MODULE

RFM69W
3.3.5. Modulation Shaping
Modulation shaping can be applied in both OOK and FSK modulation modes, to improve the narrowband response of the
transmitter. Both shaping features are controlled with PaRamp bits in RegPaRamp.
„ _{In FSK mode, a Gaussian filter with BT = 0.3, 0.5 or 1 is used to filter the modulation stream, at the input of the}
sigma-delta ^{modulator. If the Gaussian filter is enabled when the RFM69W is in Continuous mode, DCLK signal on}
the DIO1/DCLK pin will trigger an interrupt on the uC each time a new bit has to be transmitted. Please refer to
section 5.4.2 for details.
„ _{When OOK modulation is used, the PA bias voltages are ramped up and down smoothly when the PA is turned on}
and ^{off, to reduce spectral splatter.}
Note the transmitter must be restarted if the PaRamp setting is changed, in order to recalibrate the built-in filter.
3.3.6. Power Amplifiers
Three power amplifier blocks are embedded in the RFM69W. The first one, herein referred to as PA0, can generate up to
+13 dBm into a 50 Ohm load. PA0 shares a common front-end pin RFIO with the receiver LNA.
‹ _{A low power mode, where -2 dBm < Pout < 13 dBm, with PA1 enabled}
All PA settings are controlled by RegPaLevel, and the truth table of settings is given in Table 10.
Table 10 Power Amplifier Mode Selection Truth Table
Pa0On Pa1On Pa2On
Mode
1
0
0
PA0 output on pin RFIO
Power Range
-18 to +13 dBm
Pout Formula
-18 dBm + OutputPower
Other combinations
Reserved
Notes - To ensure correct operation at the highest power levels, please make sure to adjust the Over Current Protection
Limit accordingly in RegOcp,
not used (+13dBm applications and less), the pin can be left floating.
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