SX1231
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
This product datasheet contains a detailed description of the SX1231 performance and functionality. Please consult the
Semtech website for the latest updates or errata.
1. General Description
The SX1231 is a single-chip integrated circuit ideally suited for today's high performance ISM band RF applications. The
SX1231's advanced features set, including state of the art packet engine greatly simplifies system design whilst the high
level of integration reduces the external BOM to a handful of passive decoupling and matching components. It is intended
for use as high-performance, low-cost FSK and OOK RF transceiver for robust frequency agile, half-duplex bi-directional
RF links, and where stable and constant RF performance is required over the full operating range of the device down to
1.8V.
The SX1231 is intended for applications over a wide frequency range, including the 433 MHz and 868 MHz European and
the 902-928 MHz North American ISM bands. Coupled with a link budget in excess of 135 dB, the advanced system
features of the SX1231 include a 66 byte TX/RX FIFO, configurable automatic packet handler, listen mode, temperature
sensor and configurable DIOs which greatly enhance system flexibility whilst at the same time significantly reducing MCU
requirements.
The SX1231 complies with both ETSI and FCC regulatory requirements and is available in a 5x 5 mm QFN 24 lead
package
1.1. Simplified Block Diagram
VBAT1&2
VR_ANA
VR_DIG
RC
Oscillator
Power Distribution System
Σ/Δ
Modulators
LNA
Mixers
Single to
Differential
RFIO
RESET
SPI
RXTX
RSSI
AFC
GND
Division by
2, 4 or 6
DIO0
DIO1
DIO2
DIO3
DIO4
DIO5
Tank
Inductor
PA0
Loop
Filter
Frac-N PLL
Synthesizer
Ramp &
Control
VR_PA
XO
32 MHz
PA_BOOST
PA1&2
XTAL
GND
Frequency Synthesis
Receiver Blocks
Transmitter Blocks
Control Blocks
Primarily Analog
Primarily Digital
Figure 1. Block Diagram
Rev 2 - Nov 2009
Page 8
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