First Sub-GHz RF Multi-Mode PHY Transceiver delivers complete solution for IEEE 802.15.4g

The SX1257 is the first available solution to support all mandatory and optional IEEE 802.15.4g PHY modes including orthogonal frequency division multiplexing. The SX1257 can operate in both half and full-duplex mode and covers the frequency band from 862-950MHz. It is fully compliant with ETSI, FCC and ARIB regulatory requirements.

The SX1257 is designed for high performance and flexibility with a high level of integration. It is a generic RF front-end designed to support several constant and non-constant envelope modulation schemes such as MR-FSK, MR-OFDM, and MR_OQPSK. A simple 4-wire 1-bit digital interface is provided for RX and TX I/Q data, which provides maximum flexibility. The receiver integrates the RF balun and 70dB of gain control with exceptional noise figure. The TX chain is highly linear with a +6dBm 1dB compression point to support non-constant envelope modulation schemes.

The SX1257 offers both flexibility and high performance for applications desiring alternative modulation schemes to FSK and OOK, said Hardy Schmidbauer, Director of Wireless Products. It solidifies Semtech's position as a top-supplier in smart metering applications.

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Key Features of the SX1257:
• Fully flexible I and Q modulator and demodulator
• Half or full-duplex operation
• Bullet-proof RX LNA
• Analog TX and RX pre-filtering
• Programmable tap TX FIR-DAC filter
• Linear TX amplifier for both constant and non-constant envelope modulation schemes

Applications:
• Metering
• Sensor applications
• Two-way radio
• Walkie-Talkie
• RFID

Pricing and Availability:
The SX1257 (order code: SX1257IWLTRT) is available immediately in production quantities and is priced at $1.80 each in 10,000 piece lots. Semtech offers comprehensive design assistance, including field and factory-based support.