RF69 datasheet(21/81 Pages) ETC2

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RF69

Page 21

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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 RF69 is in Continuous mode, DCLK signal on pin

10 (DIO1/DCLK) 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 RF69. 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 (pin 21) with the receiver LNA.

PA1 and PA2 are both connected to pin PA_BOOST (pin 23), allowing for two distinct power ranges:

 A low power mode, where -2 dBm < Pout < 13 dBm, with PA1 enabled

 A higher power mode, when PA1 and PA2 are combined, providing up to +20 dBm to a matched load.

When PA1 and PA2 are combined to deliver +20 dBm to the antenna, a specific impedance matching / harmonic filtering

design is required to ensure impedance transformation and regulatory compliance.

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

Power Range

Pout Formula

PA0 output on pin RFIO

-18 to +13 dBm

-18 dBm + OutputPower

PA1 enabled on pin PA_BOOST

-2 to +13 dBm

-18 dBm + OutputPower

PA1 and PA2 combined on pin PA_BOOST

+2 to +17 dBm

-14 dBm + OutputPower

PA1+PA2 on PA_BOOST with high output

power +20dBm settings (see 3.3.7)

+5 to +20 dBm

-11 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, except above +18dBm where it must be disabled

- If PA_BOOST pin is not used (+13dBm applications and less), the pin can be left floating.

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