9.3.2 Transmitter Characteristics

The following table provides the ATSAMR30M18A transmitter characteristics.

Test Conditions (unless otherwise stated):

V_DD = 3.3V, f_RF = 914 MHz, T_OP = +25°C, Measurement setup in Application Reference Design.

Table 9-4. Transmitter Characteristics
Symbol	Parameter	Condition	Min.	Typ.	Max.	Unit
P_{TX_MAX}	TX Output power	BPSK-20 f_RF = 868.3 MHz (TX_PWR setting: 11)	—	8.7	—	dBm
		BPSK-40 f_RF = 914 MHz (TX_PWR setting: 11)	—	8.6	—	dBm
		OQPSK-SIN-RC-100 f_RF = 868.3 MHz (TX_PWR setting: 9)	—	5.3	—	dBm
		OQPSK-SIN-250 f_RF = 914 MHz (TX_PWR setting: 11)	—	7.3	—	dBm
P_RANGE	Output power range	36 steps, configurable in the PHY_TX_PWR register	—	35	—	dB
P_1dB	1 dB compression point	Normal mode	—	4	—	dBm
P_1dB	1 dB compression point	Boost mode	—	9	—	dBm
EVM	Error vector magnitude⁽¹⁾	BPSK-20	—	6.2	—	%rms
		BPSK-40	—	5.9	—	%rms
		BPSK-40-ALT	—	5.9	—	%rms
		OQPSK-SIN-RC-100⁽²⁾⁽³⁾	—	21.31	—	%rms
		OQPSK-SIN-250	—	15.81	—	%rms
		OQPSK-RC-100⁽³⁾	—	11.2	—	%rms
		OQPSK-RC-250	—	12.1	—	%rms
P_{2nd_HARM}	2nd Harmonics	TX_PWR setting: 11	—	—	—	—
		906 MHz	—	–52.43	—	dBm
		868.3 MHz	—	–51.35	—	dBm
P_{3rd_HARM}	3rd Harmonics	TX_PWR setting: 11	—	—	—	—
		906 MHz	—	–61.64	—	dBm
		868.3 MHz	—	–69.31	—	dBm
P_{SPUR_TX}	Spurious Emissions⁽⁴⁾	30 – ≤ 1000 MHz	—	—	-54.38	dBm
P_{SPUR_TX}	Spurious Emissions⁽⁴⁾	>1 – 12.75 GHz	—	—	-46.72	dBm

Power settings according to the TX_PWR bits in the PHY_TX_PWR register (PHY_TX_PWR.TX_PWR).
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 shows some inter-chip interference.
The EVM is valid up to +5 TX power setting.
Complies with EN 300 220, FCC 47CFR Part 15: Subpart C Section 15.247, RSS-247.