Set up M2M links over 15 km with long-range RFIC devices

June 28, 2013 // By Julien Happich
With a range of up to 15km, the SX1272 RFIC from Semtech enables metering, control and sensor applications. This device integrates Semtech's new LoRa (long range) modulation technology to enable drastic range improvements over alternative modulation methods.

In comparison, the maximum distance today of a smart meter transceiver in Europe using FSK modulation is between one and two kilometers. The additional range provided by LoRa will eliminate the need for repeaters in these applications, significantly simplifying the system design and lowering the total cost of deployment. The range extension provided by LoRa also makes the device suitable for emerging smart city, Internet of things (IOT) and machine-to-machine (M2M) applications.

The SX1272 achieves receiver sensitivity up to -137 dBm using a low-cost crystal. This compares to today’s state-of-the-art FSK devices that can achieve sensitivity of -115 dBm with a comparable crystal or -125 using an expensive temperature controlled crystal oscillator (TCXO). Additionally, the SX1272 has a 25 dB improvement over FSK devices for rejecting in-band interfering signals. The SX1272 supports GFSK, FSK, GMSK, and OOK modulation in addition to LoRa and is designed to support WMBus, IEEE 802.15.4g (SUN), FCC 15.247, ARIB T96/108, EN 300-220 as well as other worldwide standards and regulations. Operating from a 1.8 to 3.7V supply range, the SX1272 draws 9.7 or 10.8mA for the receiver, 28mA for the transceiver at +13dBm, and has a sleep current of 100nA. It supports bit rates up to 300 kbps.