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RF/Microwave??

Sub-GHz PHY transceiver supports multiple IEEE modes

Posted: 30 Jul 2012 ?? ?Print Version ?Bookmark and Share

Keywords:transceiver? OFDM? FSK? OOK?

The new SX1257 is a low power digital I/Q RF multimode PHY transceiver from Semtech Corporation that supports all mandatory and optional IEEE 802.15.4g PHY modes including orthogonal frequency division multiplexing (OFDM).

It is suitable for customers desiring higher bit rates with complex modulation schemes such as OFDM in the sub-GHz band for smart metering applications.

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 1bit 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 (NF). The TX chain is highly linear with a +6dBm 1dB compression point to support non-constant envelope modulation schemes.

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 offers both flexibility and high performance for applications desiring alternative modulation schemes to FSK and OOK.

Among the key features of the product are a fully flexible I and Q modulator and demodulator; half or full-duplex operation; bullet-proof RX LNA; analog TX and RX pre-filtering; a programmable tap TX FIR-DAC filter and linear TX amplifier for both constant and non-constant envelope modulation schemes.

Product applications include metering, sensor applications, two-way radios, walkie-talkies and RFID.

The SX1257 (order code: SX1257IWLTRT) is available immediately in production quantities and is priced at $1.80 each in 10,000 piece lots.





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