The HFA3683A is a monolithic SiGe half-duplex RF/IF transceiver designed to operate in the 2.4GHz ISM band. The receive chain features a low noise, gain selectable amplifier (LNA) followed by a down-converter mixer. An up-converter mixer and a high performance preamplifier compose the transmit chain. The remaining circuitry comprises a high frequency Phase Locked Loop (PLL) synthesizer with a three wire programmable interface for local oscillator applications.

Features
• Highly Integrated
• Multiplexed RX/TX IF Path Utilizes Single IF Filter
• Programmable Synthesizer
• Gain Selectable LNA
• Power Management/Standby Mode
• Single Supply 2.7V to 3.3V Operation

Cascaded LNA/Mixer (High Gain)
• Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25dB
• SSB Noise Figure. . . . . . . . . . . . . . . . . . . . . . . . . . . 3.7dB
• Input IP3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -13dBm
• IF Frequency . . . . . . . . . . . . . . . . . . . 280MHz to 600MHz

Cascaded LNA/Mixer (Low Gain)
• Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -5dB
• Input P1dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +2.5dBm
• IF Frequency . . . . . . . . . . . . . . . . . . . 280MHz to 600MHz

Cascaded Mixer/Preamplifier
• Transmit Cascaded Mixer/Preamplifier Gain . . . . . . .25dB
• SSB Noise Figure. . . . . . . . . . . . . . . . . . . . . . . . . . . .10dB
• Output P1dB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4dBm
• IF Frequency . . . . . . . . . . . . . . . . . . . 280MHz to 600MHz

Applications
• IEEE802.11 1MBPS and 2MBPS Standard
• Systems Targeting IEEE802.11, 11MBPS Standard
• Wireless Local Area Networks
• PCMCIA Wireless Transceivers
• ISM Systems
• TDMA Packet Protocol Radios