HFA3824

r at OR D F 4A en te c E C D t 2 r ME N A3 8 pp o m /ts CO M S ee HF ic al Su e rs il.c o E R n t in ch N OT ww. r Te t ou IL or w c a t S R on or c 8 -IN TE 1 -8 8 ® DE S NE W IGN S HFA3824 June 1998 File Number 4308.1 Direct Sequence Spread Spectrum Baseband Processor The Intersil HFA3824 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 HFA3824 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 HFA3824 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 HFA3824 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 . . . . . . . . ....