SI4455-B1A-FM Datasheet, PDF (16/40 Pages) Silicon Laboratories – EASY-TO-USE, LOW-CURRENT OOK/(G)FSK SUB-GHZ TRANSCEIVER

Si4455
3.4. Transmitter
The Si4455 contains a +13 dBm power amplifier that is capable of transmitting from –40 to +13 dBm. The output
power set size is dependent on the power level and can be seen in Figure 3. The PA power level is set using the
API command: PA_PWR_LVL. The power amplifier is single-ended to allow for easy antenna matching and low
BOM cost. For detailed matching values, BOM, and performance expectations, refer to "AN686: Antennas for the
Si4455/4355 RF ICs". Power ramp-up and ramp-down is automatically performed to reduce unwanted spectral
spreading.
Figure 3. Tx Power vs PA_PWR_LVL and VDD
16
Rev 1.1