intersil ISL3871A DATA SHEET

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ISL3871A

Data Sheet April 2002

Wireless LAN Integrated Medium Access Controller with Baseband Processor

The Intersil ISL3871A Wireless LAN Integrated Medium Acce ss Controller

with Integrated Baseband Processor is part of the PRISM® 2.4GHz radio chipset. The ISL3871A directly interfaces with the Intersil’s Zero-IF QMODEM(ISL3684). Adding Intersil’s Power Amp (ISL3984) offers the designer a complete end-to-end WLAN chipset solution. Protocol and PHY support are implemented in firmware, thus supporting customization of the WLAN solution.

Firmware implements the full IEEE 802.11 Wireless LAN MAC protocol. It supports BSS and IBSS operation under DCF, and operation under the optional point coordination function (PCF). Low level protocol functions such as RTS/CTS generation and acknowledgment, fragmentation and de-fragmentatio n, and auto matic bea con mo nito ring are handed without host intervention. Active scanning is performed autonomously once initiated by host command. Host interface command and status handshakes allow concurrent operations from multi-threaded I/O drivers. Additional firmware functions specifi c to acces s poin t applications are also available.

The ISL3871A has on-board A/D’s and D/A for analog I and Q inputs and outputs, for which the ISL3684 Zero-IF QMODEM is recommended. Differential phase shift keying modulation schemes DBPSK and DQPSK, with data scrambling capability, are available along with Complementary Code Keying to provide a variety of data rates. Both Receive and Transmit AGC functions with 7-bit AGC control obtain maximum performance in the analog portions of the transceiver.

Built-in flexibility allows the ISL3871A to be configured through a general purpose control bus, for a range of applications. The ISL3871A is housed in either a thin plastic BGA package or a TQFP flat pack suitable for PCMCIA board applications.

The ISL3871A is designed to provide maximum performance with mi nimum power c onsumption . External pin layout is organized to provide optimal PC board layout to all user interfaces including PCMCIA and USB.

FN8034

Features

• USB host interface supports USB V1.1 at 12Mbps.

• New Start up modes allow the PCMCIA card information structure to be initialized from a serial EEPROM. This allows firmware to be downloaded from the host, eliminating the parallel flash memory device

• Firmware can be loaded from serial flash memory

• Zero glue connection to 16-bit wide sram devices

• Low-frequency crysta l oscillator to ma intain time and allow baseband clock source to power off during sleep mode

• Improved performance of internal WEP engine

• Improvements to debug mode support tracing execution from on chip memory

• Programmable MBUS cycl e extension allo ws acces sing of slow memory devices without slowing the clock

• Complete DSSS baseband processor

• RAKE receiver with decision feedback equalizer

• Processing gain. . . . . . . . . . . . . . . . . . . . . FCC compliant

• Programmable data rate . . . . . . . . .1, 2, 5.5, and 11Mbps

• Available in two packages:

- Ultra small BGA package. . . . . . . . . . . . . . . 14 x 14mm

- Large LQFP flat pack for easy board layout

• Modulation methods . . . . . . . .DBPSK, DQPSK, and CCK

• Supports full or half duplex operati ons

• On-chip A/D and D/A converters for I/Q data , AGC, and adaptive power control

• Targeted for multipath delay spreads 100ns at 11Mbps, 250ns at 5.5Mbps

• Supports short preamble and antenna diversity

Applications

• PC Card Wireless LAN Adapters

• USB Wireless LAN Adapters

• PCN / Wireless PBX / Wireless Local Loop

• High Data Rate Wireless LAN Systems Targeting IEEE

802.11b Standard

• Wireless LAN Access Points and Bridge Products

• Spread Spectrum WLAN RF Modems

• TDMA or CSMA Packet Protocol Radios

• ISA, ISA PnP WLAN Cards

PRISM® is a registered trademark of Intersil Americas Inc. PRISM and design is a trademark of Intersil Americas Inc.

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

| Intersil (and design) is a registered trademark of Intersil Americas Inc.