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RFM92W-868S2 Datasheet(PDF) 10 Page - List of Unclassifed Manufacturers |
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RFM92W-868S2 Datasheet(HTML) 10 Page - List of Unclassifed Manufacturers |
10 / 126 page RFM92W/93W V3.0 Page 10 Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com 1. General Description The RFM92W/93W incorporates the LoRaTM 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. LoRaTM 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 Figure 1. RFM92W/93W Block Diagram RFM92W/93W |
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