2.4GHz RF/IF Converter and Synthesizer

The ISL3685 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 prescribes 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -12dBm

• IF Frequency . . . . . . . . . . . . . . . . . . . 280MHz to 600MHz

Cascaded LNA/Mixer (Low Gain)

• Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -9dB

• 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

• MINI PCI Wireless Transceivers