SM1211E915 Semtech, SM1211E915 Datasheet - Page 21

• Manufacturer Part Number: SM1211E915
• Description: Dev Kit Accessory
• Manufacturer: Semtech

Specifications of SM1211E915

• Modulation Type: FSK, OOK
• Data Rate Max: 200Kbps
• Frequency Range: 902MHz To 928MHz
• Supply Voltage Range: 2.1V To 3.6V
• Module Interface: SPI
• Supply Current: 25mA
• Accessory Type: RF Module
• Sensitivity: -105dBm
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Package Type: TQFN EP
• Operating Supply Voltage (min): 2.1V
• Operating Supply Voltage (typ): 2.5/3.3V
• Operating Supply Voltage (max): 3.6V
• Sensitivity (dbm): -105dBm
• Rohs Compliant: NA
• Lead Free Status / RoHS Status: na
• Lead Free Status / RoHS Status: na

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