SI4X55-C Datasheet, PDF (15/39 Pages) Silicon Laboratories – Preamble sense mode

Si4x55-C
3.4. Transmitter
The device 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 4. 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 4. Tx Power vs PA_PWR_LVL and VDD
Rev 1.0
15