The Intersil 2.4GHz PRISM™ chip set is a highly integrated six-chip solution for RF modems employing Direct Sequence Spread Spectrum (DSSS) signaling. Significant integration of transmit and receive functions employ the following ICs: complete integrated DSSS engine, the HFA3824; a quadrature modulator/demodulator, integrated with an IF limiter amplifier with RSSI, the HFA3724, HFA3726; a combined LNA/Mixer and upconverter/preamplifier, the HFA3624; a high performance, low noise amplifier for increased receiver sensitivity, the HFA3424; a dual synthesizer, the HFA3524 and a monolithic RF power amplifier, the HFA3925. Each of the functions may be used individually or in any combination in support of a variety of RF modem applications.

FEATUREs
• Provides Antenna-to-Bits™ Data Stream
• Low Voltage Operation from 2.7V to 5.5V
• 2.4GHz - 2.5GHz ISM Band Operation
• Single Heterodyne Conversion
• Programmable Antialiasing and Shaping Filters
• 10MHz to 400MHz IF Operation with RSSI
• Autonomous Half Duplex Direct Sequence Modem
• Selectable DBPSK, DQPSK Signalling
• Antenna Diversity Selection
• Direct Sequence Physical Layer (DS-PHY)
• Differential Data Encoding/Decoding
• Programmable 16-Bit PN Code
• Data Rates up to 4 MBPS DQPSK
• Power Management Control
• Low Profile PCMCIA-Compatible Surface Mount Packaging

APPLICATIONs
• Systems Targeting IEEE 802.11 Standard
• PCMCIA Wireless Transceiver
• WLAN RF Modems
• TDMA Packet Protocol Radios
• Part 15 Compliant Radio Links