The Intersil HFA3824A Direct Sequence (DSSS) baseband processor is part of the PRISM™ 2.4GHz radio chipset, and contains all the functions necessary for a full or half duplex packet baseband transceiver.

The HFA3824A has on-board ADC’s for analog I and Q inputs, for which the HFA3724/6 IF QMODEM is recommended. Differential phase shift keying modulation schemes DBPSK and DQPSK, with optional data scrambling capability, are combined with a programmable PN sequence of up to 16 bits. Built-in flexibility allows the HFA3824A to be configured through a general purpose control bus, for a wide range of applications. A Receive Signal Strength Indicator (RSSI) monitoring function with on-board 6-bit 2 MSPS ADC provides Clear Channel Assessment (CCA) to avoid data collisions and optimize network throughput. The HFA3824A is housed in a thin plastic quad flat package (TQFP) suitable for PCMCIA board applications.

Features

• Complete DSSS Baseband Processor

• High Data Rate. . . . . . . . . . . . . . . . . . . . . . .up to 4 MBPS

• Processing Gain . . . . . . . . . . . . . . . . . . . . . . . . up to 12dB

• Programmable PN Code . . . . . . . . . . . . . . . .up to 16 Bits

• Ultra Small Package . . . . . . . . . . . . . . . . . . . . 7 x 7 x 1mm

• Single Supply Operation (44MHz Max) . . . . . 2.7V to 5.5V

• Modulation Method. . . . . . . . . . . . . . . .DBPSK or DQPSK

• Supports Full or Half Duplex Operations

• On-Chip A/D Converters for I/Q Data (3-Bit, 44 MSPS) and RSSI (6-Bit, 2 MSPS)

• Backward Compatible with HSP3824

• Programmable Rotation I, Q Sense

Applications

• Systems Targeting IEEE802.11 Standard

• DSSS PCMCIA Wireless Transceiver

• Spread Spectrum WLAN RF Modems

• TDMA Packet Protocol Radios

• Part 15 Compliant Radio Links

• Portable Bar Code Scanners/POS Terminal

• Portable PDA/Notebook Computer

• Wireless Digital Audio

• Wireless Digital Video

• PCN/Wireless PBX