15.15.3 Transmitter Characteristics

Test Conditions (unless otherwise stated):

VDD = 3.0V, fRF = 914MHz, TOP = +25°C, Measurement setup in Basic Application Schematic.

Symbol Parameter Condition Min. Typ. Max. Unit
PTX_MAX TX Output power Maximum configurable TX output power value
Normal mode +5 dBm
Boost mode +10 +11 dBm
PRANGE Output power range 36 steps, configurable in the PHY_TX_PWR register 35 dB
PACC Output power tolerance 868.3MHz ±3 dB
P1dB 1dB compression point Normal mode 5 dBm
Boost mode 10 dBm
EVM Error vector magnitude(1) BPSK-20 5 %rms
BPSK-40 8 %rms
BPSK-40-ALT 8 %rms
OQPSK-SIN-RC-100(2)(3) 29 %rms
OQPSK-SIN-250 16 %rms
OQPSK-RC-100(3) 10 %rms
OQPSK-RC-250 10 %rms
P2nd_HARM 2nd Harmonics(4) TX power: +10dBm
914MHz –27 dBm
868.3MHz –26 dBm
782MHz –28 dBm
TX power: -2dBm
914MHz –53 dBm
868.3MHz –46 dBm
782MHz –42 dBm
P3rd_HARM 3rd Harmonics(4) TX power: +10dBm
914MHz –22 dBm
868.3MHz –22 dBm
782MHz –23 dBm
TX power: -2dBm
914MHz –38 dBm
868.3MHz –38 dBm
782MHz –37 dBm
PSPUR_TX Spurious Emissions(5) 30 – ≤ 1000MHz -36 dBm
>1 – 12.75GHz -30 dBm
  1. Power settings according to the TX_PWR bits in the PHY_TX_PWR register (PHY_TX_PWR.TX_PWR).
  2. The EVM of OQPSK-SIN-RC-100 is significantly higher than the EVM of the other modulation schemes. This phenomenon can be explained by the fact that the combination of SIN and RC shaping as specified in IEEE 802.15.4-2006/2011 inherently show some inter-chip interference.
  3. The EVM is valid up to +5dBm.
  4. Measured single ended @ RFP/ RFN into 50Ω; termination of the other pin with 50Ω; constant wave signal.
  5. Complies with EN 300 220, FCC-CFR-47 part 15, ARIB STD-108, RSS-210.