AX5031 datasheet(16/36 Pages) ONSEMI

16 / 36 page

Circuit Description

www.onsemi.com

AX5031

Circuit Description

The AX5031 is a true single chip low-power CMOS transmitter primarily for use in SRD bands.

The on-chip transmitter consists of a fully integrated RF front-end with modulator, and

demodulator. Base band data processing is implemented in an advanced and flexible

communication controller that enables user friendly communication via the SPI interface.

AX5031 can be operated from a 2.2 V to 3.6 V power supply over a temperature range of

-40oC to 85oC, it consumes 11 - 45 mA for transmitting, depending on the output power.

The AX5031 features make it an ideal interface for integration into various battery powered

SRD solutions such as ticketing or as transmitter for telemetric applications e.g. in sensors. As

primary application, the transmitter is intended for UHF radio equipment in accordance with

the European Telecommunication Standard Institute (ETSI) specification EN 300 220-1 and the

US Federal Communications Commission (FCC) standard CFR47, part 15. The use of AX5031 in

accordance to FCC Par 15.247, allows for improved range in the 915 MHz band. Additionally

AX5031 is compatible with the low frequency standards of 802.15.4 (ZigBee).

The AX5031 receives data via the SPI port in frames. This standard operation mode is called

Frame Mode. Pre and post ambles as well as checksums can be generated automatically.

Interrupts control the data flow between a controller and the AX5031.

The AX5031 behaves as a SPI slave interface. Configuration of the AX5031 is also done via

the SPI interface.

AX5031 supports any data rate from 1 kbps to 350 kbps for FSK and MSK, from 1 kbps to 2000

kbps for ASK and from 10 kbps to 2000 kbps for PSK. To achieve optimum performance for

specific data rates and modulation schemes several register settings to configure the AX5031

are necessary, they are outlined in the following, for details see the AX5031 Programming

Manual.

Spreading is possible on all data rates and modulation schemes. The net transfer rate is

reduced by a factor of 15 in this case. For ZigBee either 600 or 300 kbps modes have to be

chosen.

AX5031 Datasheet(PDF) 16 Page - ON Semiconductor