AX5051 is a universal single-chip RF transceiver for the 433/868/915 MHz SRD bands. It is typically used for medium distances up to 1 km. The supported data rates for this transceiver are 1 - 600 kbps.

The AX5051 transceiver consists of an integrated RF front-end with modulator and demodulator, flexible communication controller and integrated voltage regulator. Base band data processing is implemented in the integrated communication controller for user-friendly communication and configuration via SPI interface. The integrated framing enables the use of low cost external micro-controllers.

Higher data rates of up to 350 kbps for FSK modulated data and 600 kbps for ASK/PSK modulated data differentiate this chip from the AXSEM narrow-band line of transceivers. The receiver sensitivities are -116 dBm at 1.2 kbps and -103 dBm at 100 kbps, the values can be reached for operation at 433 MHz, 868 MHz and 915 MHz. Together with an output power of up to 16 dBm this allows to build a system with an attractive link budget.

The AX5051 supportsFSK, MSK, PSK and ASK modulations. In transmit mode all modulations are shaped. The AX5051 features an easy to use protocol implemented in hardware. This guarantees shortest code size and lowest CPU usage of a microcontroller. CRCs are calculated automatically both in RX and TX. Digital spread spectrum is possible on all modulations.External components are only a crystal, an antenna and a few passive components. All parameters of the AX5051 including modulation, frequency, deviation and output power can be programmed via an SPI interface. Systems built with the AX5051 provide cost-efficient, longest range bi-directional communication links.

• Supported modulations: FSK, MSK, PSK and ASK
• Programmable channel filtering
• Communication with the device via SPI interface
• Optional data transfer can be handled via a UART interface
• Supports HDLC and Raw frames in hardware
• Automatic frequency control (AFC)
• Integrated RX/TX switching with differential antenna pins
• RF Carrier and FSK deviation programmable in 1 Hz steps
• Brown-out detection
• Freely programmable general purpose IOs