OVERVIEW
The MRF24J40 is an IEEE 802.15.4™ Standard compliant 2.4 GHz RF transceiver. It integrates the PHY and MAC functionality in a single chip solution. Figure 1-1 shows a simplified block diagram of a MRF24J40 wireless node. The MRF24J40 creates a low-cost, low-power, low data rate (250 or 625 kbps) Wireless Personal Area Network (WPAN) device. The MRF24J40 interfaces to many popular Microchip PIC® microcontrollers via a 4-wire serial SPI interface, interrupt, wake and Reset pins.

FEATUREs:
• IEEE 802.15.4™ Standard Compliant RF Transceiver
• Supports ZigBee®, MiWi™, MiWi P2P and Proprietary Wireless Networking Protocols
• Simple, 4-Wire Serial Peripheral Interface (SPI)
• Integrated 20 MHz and 32.768 kHz Crystal Oscillator Circuitry
• Low-Current Consumption:
   - RX mode: 19 mA (typical)
   - TX mode: 23 mA (typical)
   - Sleep: 2 μA (typical)
• Small, 40-Pin Leadless QFN 6x6 mm2 Package

RF/Analog Features:
• ISM Band 2.405-2.48 GHz Operation
• Data Rate: 250 kbps (IEEE 802.15.4); 625 kbps (Turbo mode)
• -95 dBm Typical Sensitivity with +5 dBm Maximum Input Level
• +0 dBm Typical Output Power with 36 dB TX Power Control Range
• Differential RF Input/Output with Integrated TX/RX Switch
• Integrated Low Phase Noise VCO, Frequency Synthesizer and PLL Loop Filter
• Digital VCO and Filter Calibration
• Integrated RSSI ADC and I/Q DACs
• Integrated LDO
• High Receiver and RSSI Dynamic Range

MAC/Baseband Features:
• Hardware CSMA-CA Mechanism, Automatic Acknowledgement Response and FCS Check
• Independent Beacon, Transmit and GTS FIFO
• Supports all CCA modes and RSSI/ED
• Automatic Packet Retransmit Capability
• Hardware Security Engine (AES-128) with CTR, CCM and CBC-MAC modes
• Supports Encryption and Decryption for MAC Sublayer and Upper Layer