RF98 datasheet(21/121 Pages) HOPE

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Page 21

RF96/97/98

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WIRELESS & SENSING

PRELIMINARY

DATASHEET

All major parameters of the RF front end and digital state machine are fully configurable via an SPI interface which gives

access to RF96/97/98

‟s configuration registers. This includes a mode auto sequencer that oversees the transition and

calibration of the RF96/97/98 between intermediate modes of operation in the fastest time possible.

The RF96/97/98 are equipped with both standard FSK and long range spread spectrum (LoRaTM) modems. Depending

upon the mode selected either conventional OOK or FSK modulation may be employed or the LoRaTM spread spectrum

modem.

3.1. LoRa

TM Modem

The LoRaTM modem uses a proprietary spread spectrum modulation technique. This modulation, in contrast to legacy

modulation techniques, permits an increase in link budget and increased immunity to in-band interference. At the same

time the frequency tolerance requirement of the crystal reference oscillator is relaxed - allowing a performance increase for

a reduction in system cost. For a fuller description of the design trade-offs and operation of the RF96/97/98 please

consult Section 4.1 of the datasheet.

3.2. FSK/OOK Modem

In FSK/OOK mode the RF96/97/98 supports standard modulation techniques including OOK, FSK, GFSK, MSK and

GMSK. The RF96/97/98 is especially suited to narrow band communication thanks the low-IF architecture employed and

the built-in AFC functionality. For full information on the FSK/OOK modem please consult Section 4.2 of this document.

RF98 データシート(PDF) 21 Page - HOPE Microelectronics CO., Ltd.