SX1279 查看數據表（PDF） - Semtech Corporation

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SX1279

137 MHz to 1020 MHz Low Power Long Range Transceiver

Semtech Corporation 

SX1276/77/78/79

WIRELESS, SENSING & TIMING

DATASHEET

1. General Description

The SX1276/77/78/79 incorporates the LoRaTM spread spectrum modem which is capable of achieving significantly longer

range than existing systems based on FSK or OOK modulation. At maximum data rates of LoRaTM the sensitivity is 8dB

better than FSK, but using a low cost bill of materials with a 20ppm XTAL LoRaTM can improve receiver sensitivity by more

than 20dB compared to FSK. 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 SX1276 and SX1279 offer bandwidth options ranging from 7.8 kHz to 500 kHz with spreading factors ranging from 6 to

12, and covering all available frequency bands. The SX1277 offers the same bandwidth and frequency band options with

spreading factors from 6 to 9. The SX1278 offers bandwidths and spreading factor options, but only covers the lower UHF

bands.

1.1. Simplified Block Diagram

Figure 1. Block Diagram

Rev. 4 - March 2015

©2015 Semtech Corporation

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