SM1211E915TOPIC Semtech, SM1211E915TOPIC Datasheet - Page 21

• Manufacturer Part Number: SM1211E915TOPIC
• Description: KIT PICTAIL EXT FOR SX1211
• Manufacturer: Semtech
• Type: Transceiver, UHFr

Specifications of SM1211E915TOPIC

• Frequency: 915MHz
• For Use With/related Products: SX1211
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

As the PA and the LNA front-ends in the SX1211 share the same Input/Output pin, they are internally matched to
approximately 50 .
Please refer to the reference design section for an optimized PA load setting.
Rev 7 – Sept 2
ADVANCED COMMUNICATIONS & SENSING
nd
, 2008
3.3.7.2. Optimum Load Impedance
VR_PA
PA Output
power
DATA
[V]
Figure 11: Optimal Load Impedance Chart
60 dB
95 %
Figure 10: PA Control
t
t
VR_PA
PA_OUT
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t
t
VR_PA
PA_OUT
60 dB
95 %
Pmax-1dB circle
Pmax-1dB circle
Pmax-1dB circle
Pmax-1dB circle
Max Power
Max Power
Max Power
Max Power
Zopt = 30+j25
Zopt = 30+j25
Zopt = 30+j25
Zopt = 30+j25
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SX1211