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SX1230
Integrated Transmitter IC
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
7.7. Matching for 13 dBm Output Power and Below
For operation at or below 13 dBm of output power, the matching configuration of the following figures is recommended for
use in the 915 MHz, 868 MHz and 434/351 MHz bands respectively. Whilst the 17 dBm matching of the preceding section
can be used, the adoption of the following matching configurations will guarantee that the current consumption in transmit
mode is optimized.
VR_PA
0.68 pF
22 nH
S/C
10 pF
RFOUT
3.3 pF
6.8 nH
5.6 nH
27 pF
3.3 pF
13 dBm
Figure 18. Consumption Optimized Matching for 915 MHz operation at or below 13 dBm Output Power
VR_PA
22 nH
0.68 pF
0.68 pF
S/C
22 pF
RFOUT
3.3 pF
6.8 nH
5.6 nH
3.3 pF
13 dBm
8.2 pF
Figure 19. Consumption Optimized Matching for 868 MHz Operation at or below 13 dBm Output Power
VR_PA
1.8 pF
47 nH
5.6 nH
100 pF
RFOUT
5.6 pF
18 nH
18 nH
10 pF
6.8 pF
13 dBm
Figure 20. Consumption Optimized Matching for 315/434 MHz Operation at or below 13 dBm Output Power
SX1230, Revision 2 May 2009
?2008 Semtech Corp.
Page 33
www.semtech.com
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