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SX1230
Integrated Transmitter IC
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
7.6. Operation with 17 dBm Output Power
With both power amplifiers enabled the SX1230 can generate a 17 dBm (50 mW) output. Starting with the default power
amplifier configuration, the register changes necessary to avail of the full output power are:
The over current protection limiter (OCP) through which the PA is biased must be increased to 100 mA.
Both PA1 and PA 2 must be enabled.
A programmed power output (pow_val) must be set to 13 dBm.
The ideal matching network for full regulatory compliance with FCC Part 15 for 915 MHz operation is shown in Figure 15
where, in addition to matching, is an additional discrete notch filter for harmonic rejection.
VR_PA
0.68 pF
12 nH
6.2 nH
33 pF
RFOUT
10 nH
17 dBm
6.8 pF
2.7 pF
Figure 15. Single 17 dBm Matching Circuit for both 902-928 MHz (FCC) and 868 MHz (ETSI) Compliance
Figures 9 and 10 show the circuit diagrams of the 434 MHz ETSI and 315 MHz FCC compliant matching schemes.
Although the full power may not necessarily be availed of in these bands, 17 dBm operation can permit the use of lower
gain, electrically small antennas.
VR_PA
33 nH
3.3 pF
3.3 pF
1.5 nH
33 pF
RFOUT
15 pF
10 nH
18 nH
15 pF
10 pF
17 dBm
Figure 16. Output Matching for 17 dBm Output Power in the 434 MHz Band
SX1230, Revision 2 May 2009
?2008 Semtech Corp.
Page 31
www.semtech.com
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