RFM92 Datasheet, PDF (10/126 Pages) List of Unclassifed Manufacturers – Low Power Long Range Transceiver Module

RFM92W/93W V3.0
1. General Description
The RFM92W/93W incorporates the LoRa^TM spread spectrum modem which is capable of achieving significantly longer
range than existing systems based on FSK or OOK modulation. With this new modulation scheme sensitivities 8 dB
better than equivalent FSK can be achieved with a low-cost, low-tolerance crystal reference. This increase in link budget
provides much longer range and robustness without the need for a TCXO or external amplification. LoRa^TM Also provides
significant advances in selectivity and blocking performance, further improving communication reliability. For maximum
flexibility the user may decide on the spread spectrum modulation bandwidth (BW), spreading factor (SF) and error
correction rate (CR). Another benefit of the spread modulation is that each spreading factor is orthogonal - thus multiple
transmitted signals can occupy the same channel without interfering. This also permits simple coexistence with existing
FSK based systems. Standard GFSK, FSK, OOK, and GMSK modulation is also provided to allow compatibility with
existing systems or standards such as wireless MBUS and IEEE 802.15.4g.
The RFM92W offers three bandwidth options of 125 kHz, 250 kHz, and 500 kHz with spreading factors ranging from 6 to
12. The RFM93W offers the same bandwidth options with spreading factors from 6 to 9.
1.1. Simplified Block Diagram
RFM92W/93W
Figure 1. RFM92W/93W Block Diagram
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