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Semtech SX1276/77/78/79 137 MHz to 1020 MHz Low Power Long Range Transceiver

 2016-12-07

【產品特性】

 LoRaTM Modem
 168 dB maximum link budget
 +20 dBm - 100 mW constant RF output vs. V supply
 +14 dBm high efficiency PA
 Programmable bit rate up to 300 kbps
 High sensitivity: down to -148 dBm
 Bullet-proof front end: IIP3 = -11 dBm
 Excellent blocking immunity
 Low RX current of 9.9 mA, 200 nA register retention
 Fully integrated synthesizer with a resolution of 61 Hz
 FSK, GFSK, MSK, GMSK, LoRaTMand OOK modulation
 Built-in bit synchronizer for clock recovery
 Preamble detection
 127 dB Dynamic Range RSSI
 Automatic RF Sense and CAD with ultra-fast AFC
 Packet engine up to 256 bytes with CRC
 Built-in temperature sensor and low battery indicator

【產品應用】

 Automated Meter Reading
 Home and Building Automation
 Wireless Alarm and Security Systems
 Industrial Monitoring and Control
 Long range Irrigation Systems

【文字介紹】

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.