15.15.3 Transmitter Characteristics

Test Conditions (unless otherwise stated):

V_DD = 3.0V, f_RF = 914MHz, T_OP = +25°C, Measurement setup in Basic Application Schematic.


Symbol	Parameter	Condition	Typ.	Max.	Unit
P_{TX_MAX}	TX Output power	Maximum configurable TX output power value
		Normal mode	+5		dBm
		Boost mode	+10	+11	dBm
P_RANGE	Output power range	36 steps, configurable in the PHY_TX_PWR register	35		dB
P_ACC	Output power tolerance	868.3MHz		±3	dB
P_1dB	1dB compression point	Normal mode	5		dBm
P_1dB	1dB compression point	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
P_{2nd_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
P_{3rd_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
P_{SPUR_TX}	Spurious Emissions⁽⁵⁾	30 – ≤ 1000MHz		-36	dBm
P_{SPUR_TX}	Spurious Emissions⁽⁵⁾	>1 – 12.75GHz		-30	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 show some inter-chip interference.
The EVM is valid up to +5dBm.
Measured single ended @ RFP/ RFN into 50Ω; termination of the other pin with 50Ω; constant wave signal.
Complies with EN 300 220, FCC-CFR-47 part 15, ARIB STD-108, RSS-210.