ISL3685

www.DataSheet4U.com ISL3685 TM Data Sheet January 2001 File Number 4860.2 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. A reduced filter count is realized by multiplexing the receive and transmit IF paths and by sharing a common differential matching network. Furthermore, both transmit and receive RF amplifiers can be directly connected to mixers as bandwidth characteristics attenuate image frequencies. The inherent image rejection of both the transmit and receive functions allows this economic advantage. The ISL3685 is housed in a 44 lead MLFP package well suited for PCMCIA board and MINI PCI 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 . . . . . ....