Semtech SX1308 IMLTRT Indoor Micro Gateway Digital Baseband Chip
Published time: 2020-12-11 14:50:14
Semtech SX1308 is a digital baseband chip mainly used for indoor LoRaWAN pico gateways, with a sensitivity of -139dBm and dynamic data rate adjustment (ADR). The SX1308 digital baseband chip is a huge digital signal processing engine, specially designed to provide breakthrough gateway functions in the ISM worldwide, and integrates LoRa concentrator IP.
Functional block diagram:
SX1308 generally connects two SX1257 (or SX1255). SX125x is a radio frequency front-end chip, which is responsible for converting I/Q (In-phase / Quadrature, in-phase quadrature digital signals) into radio analog signals.
2x SX1257 radio front end supports 868 MHz bands and antenna diversity
2x SX1255 radio front end is 433 MHz band with antenna diversity support
1x SX1257 and 1x SX1255, dual-frequency operation can be performed simultaneously
The IF of all modems can independently adjust the baseband bandwidth within the allowed radio range, such as ±400khz. Provides optimized firmware to optimize the settings of the SX1257/55 radio and performs real-time automatic gain control. As shown in the following block diagram:
Semtech SX1308 features:
Up to -139dBm sensitivity with SX1257 or SX1255 Tx/Rx front end
70dB continuous wave interference offset at 1MHz
Can work under negative signal-to-noise ratio
CCR up to 9dB
49x LoRa demodulator and 1x (G)FSK demodulator
Dual digital Tx and Rx radio front-end interface
10 programmable parallel demodulation paths
Dynamic data rate adjustment (ADR)
Semtech SX1308 Product Description
SX1308 is a constant frequency and uses a 6-pin SOT23 current-mode boost converter, so it is suitable for small, low-power applications. It is worth noting that the switching frequency of SX1308 is 1.2MHz, and small and low-cost capacitors and inductors with a height of less than 2mm can be used. Internal soft-start reduces inrush current and extends battery life. SX1308 has the function of automatically switching to pulse frequency modulation mode under a light load. SX1308 includes under-voltage lockout, current limit, and thermal overload protection to prevent damage in case of an output overload.
Semtech SX1308 application areas:
Secure sensor network
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