Semtech SX1272/73 860 MHz to 1020 MHz Low Power Long Range Transceiver智慧城市::热点频道::大联大控股


Semtech SX1272/73 860 MHz to 1020 MHz Low Power Long Range Transceiver



 LoRaTM Modem
 157 dB maximum link budget
 +20 dBm at 100 mW constant RF output vs. V supply
 +14 dBm high efficiency PA
 Programmable bit rate up to 300 kbps
 High sensitivity: down to -137 dBm
 Bullet-proof front end: IIP3 = -12.5 dBm
 Low RX current of 10 mA, 100 nA register retention
 Fully integrated synthesizer with a resolution of 61 Hz
 FSK, GFSK, MSK, GMSK, LoRaTM and 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


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


The SX1272/73 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 data rate 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 SX1272 offers three bandwidth options of 125 kHz, 250 kHz, and 500 kHz with spreading factors ranging from 6 to 12.