Datasheet
Table Of Contents
- 1. General Description
- 2. Electrical Characteristics
- 3. SX1272/73 Features
- 4. SX1272/73 Digital Electronics
- 4.1. The LoRaTM Modem
- 4.2. FSK/OOK Modem
- 4.2.1. Bit Rate Setting
- 4.2.2. FSK/OOK Transmission
- 4.2.3. FSK/OOK Reception
- 4.2.4. Operating Modes in FSK/OOK Mode
- 4.2.5. General Overview
- 4.2.6. Startup Times
- 4.2.7. Receiver Startup Options
- 4.2.8. Receiver Restart Methods
- 4.2.9. Top Level Sequencer
- 4.2.10. Data Processing in FSK/OOK Mode
- 4.2.11. FIFO
- 4.2.12. Digital IO Pins Mapping
- 4.2.13. Continuous Mode
- 4.2.14. Packet Mode
- 4.2.15. io-homecontrol® Compatibility Mode
- 4.3. SPI Interface
- 5. SX1272/73 Analog & RF Frontend Electronics
- 6. Description of the Registers
- 7. Application Information
- 8. Packaging Information
- 9. Revision History
www.semtech.comPage 85
SX1272/73
WIRELESS, SENSING & TIMING DATASHEET
Rev. 2 - July 2014
©2014 Semtech Corporation
Figure 43. Receiver Block Diagram
5.5.3. Automatic Gain Control In FSK/OOK Mode
The AGC feature allows receiver to handle a wide Rx input dynamic range from the sensitivity level up to maximum input
level of 0 dBm or more, whilst optimizing the system linearity.
The following table shows typical NF and IIP3 performances for the SX1272/73 LNA gains available.
Table 36 LNA Gain Control and Performances
RX input level (Pin)
Gain
Setting
LnaGain
Relative LNA
Gain [dB]
NF
[dB]
IIP3
[dBm]
Pin <= AgcThresh1 G1 ‘001’ 0 dB 7 -12
AgcThresh1 < Pin <= AgcThresh2 G2 ‘010’ -6 dB 11 -8
AgcThresh2 < Pin <= AgcThresh3 G3 ‘011’ -12 dB 16 -5
AgcThresh3 < Pin <= AgcThresh4 G4 ‘100’ -24 dB 26 5
AgcThresh4 < Pin <= AgcThresh5 G5 ‘110’ -26 dB 34 10
AgcThresh5 < Pin G6 ‘111’ -48 dB 44 10