SX1308
General Description
Manufacturer
unknown
Overview
Part: SX1308
Type: LoRa Concentrator Digital Baseband Chip
Key Specs:
- Sensitivity: Up to -139 dBm (with SX1257 or SX1255 Tx/Rx front-end)
- CW Interferer Rejection: 70 dB at 1 MHz offset
- CCR: Up to 9 dB
- Demodulators: Emulates 49x LoRa and 1x (G)FSK demodulators
Features:
- Able to operate with negative SNR
- Dual digital Tx & Rx radio front-end interfaces
- 10 programmable parallel demodulation paths
- Dynamic data-rate adaptation (ADR)
- True antenna diversity or simultaneous dual-band operation
Applications:
- Smart Metering
- Security Sensors Network
- Agricultural Monitoring
- Internet of Things (IoT)
Package:
- 64-pin package with exposed ground paddle
Features
- Up to -139 dBm sensitivity with SX1257 or SX1255 Tx/Rx front-end
- 70 dB CW interferer rejection at 1 MHz offset
- Able to operate with negative SNR
- CCR up to 9 dB
- Emulates 49x LoRa demodulators and 1x (G)FSK demodulator
- Dual digital Tx & Rx radio front-end interfaces
- 10 programmable parallel demodulation paths
- Dynamic data-rate adaptation (ADR)
- True antenna diversity or simultaneous dual-band operation
Applications
- Smart Metering
- Security Sensors Network
- Agricultural Monitoring
- Internet of Things (IoT)
Electrical Characteristics
The table below gives the specifications of the circuit within the Operating Conditions as indicated in 2.3 unless otherwise specified.
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Current Consumption | ||||||
| Current in idle mode | IVDDCORE,IDLE | 1.8V supply current in Idle mode1 | 120 | 5000 | uA | |
| IVDDIO,IDLE | 3.3V supply current in idle mode | 1 | 2 | uA | ||
| Current in medium active | IVDDCORE,MED | 1.8V supply current with 4 active paths | 330 | 600 | mA | |
| IVDDIO,MED | 3.3V supply current with 4 active paths – no load | 5 | 10 | mA | ||
| Current in full active | IVDDCORE,FULL | 1.8V supply current with 8 active paths | 550 | 800 | mA | |
| IVDDIO,FULL | 3.3V supply current with 8 active paths – no load | 5 | 10 | mA | ||
| IO Pins levels | ||||||
| Logic low input threshold | VIL | "0" logic input | 0.4 | V | ||
| Logic high input threshold | VIH | "1" logic input | VDDIO – 0.4 | V | ||
| Logic low output level | VOL | "0" logic output, 2 mA sink | VSS | VSS + 0.4 | V | |
| Logic high output level | VOH | "1" logic output, 2 mA source | VDDIO – 0.4 | VDDIO | V |
Table 5: Electrical Specifications
Absolute Maximum Ratings
Stresses above the values listed below may cause permanent device failure. Exposure to absolute maximum ratings for extended periods may affect device reliability. Operation outside the parameters specified in the Operating Conditions section is not implied.
| Parameter | Symbol | Conditions | Value |
|---|---|---|---|
| IO power supply to VSS | VDDIO,ABSMAX | -0.5 V to 4.0 V | |
| Core power supply to VSS | VDDCORE,ABSMAX | -0.5 V to 2.0 V | |
| Storage temperature | TJ,STORE | -50 °C to 150 °C | |
| Junction temperature | TJ,ABSMAX | -40 °C to 125 °C | |
| Pin voltage on IO and Clock pins | VDPIN,ABSMAX | -0.3 V to VDDIO + 0.3 V | |
| Peak reflow temperature | TPKG | 260 °C | |
| Latchup | ILUP | JESD78D, class I | +/-100 mA |
| Humidity | HR | 0 – 95 % | |
| ESD | HBM | Human Body Model | 2 kV |
| JESD22-A114 CLASS 2 | |||
| CDM | Charged Device Model | 300 V | |
| JESD22-C101 CLASS III | |||
| Table 2: Absolute Maximum Ratings |
2.2 Constraints on External
Circuit is expected to be used with the following external conditions.
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Radio ADC samples clock input | XTAL32F | Clock for data communication | 32 | MHz | ||
| frequency | with Tx† | |||||
| ADC sample clock frequency | XTAL32T | -10 | +10 | ppm | ||
| tolerance | ||||||
| High speed processing clock | HSC_F | Clock for data processing | 130 | 133 | 150 | MHz |
| Load on IO pins | CLOP | 0 | 25 | pF | ||
| Notes: | ||||||
| † The data communication IOs are A_I_RX, A_Q_RX, B_X_RX, B_Q_RX and clock signal is CLK32M | ||||||
| Table 3: Externals |
2.3 Operating Conditions
The circuit will operate full specs within the following operating conditions.
| Parameter† | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Digital IO supply | VDDIO | Operating Conditions for | 3.0 | 3.6 | V | |
| Electrical Specification | ||||||
| Digital core supply | VDDCORE | Operating Conditions for | 1.75 | 1.85 | V | |
| Electrical Specification | ||||||
| Ambient operating temperature | TA | With chip paddle soldered to | 0 | 70 | °C | |
| PCB ground plan with | ||||||
| minimum 100 cm2 air | ||||||
| exposed area and heat sink | ||||||
| Table 4: Operating Conditions for Electrical Specifications |
Thermal Information
Thermal impedance with natural convection is 16.4 °C/W. Thermal impedance with heat sink on package bottom is 0.18 °C/W.
The measurement was made with chip paddle soldered to PCB ground plane with minimum 100 cm2 air exposed area and heat sink per JESD51-7. The package is mounted on a 4-layer (2S2P) standard JEDEC board.
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