ISL3685

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . .  . . . . . . . . . 3.6V
V_CC to V_CC Decouple . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +0.3V
Any GND to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +0.3V

CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

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.