ISL3871IK18, ISL3871IN18
®
Data Sheet
Ma rc h 2003
FN8040.1
Wireles s LAN Integrated Medium Acces s
Controller with Bas eband Proces s or
Features
• USB host interface supports USB V1.1 at 12Mbps.
The Intersil ISL3871 Wireless LAN
Integrated Medium Access Controller
with Integrated Baseband Processor
• 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
is part of the PRISM® 2.4GHz radio chipset. The ISL3871
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 can be loaded from serial flash memory
• Zero glue connection to 16-bit wide SRAM devices
• Low-frequency crystal oscillator to maintain 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
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-fragmentation, and automatic beacon monitoring 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 specific to access point
applications are also available.
• Programmable MBUS cycle extension allows accessing 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 operations
• On-chip A/D and D/A converters for I/Q data, AGC, and
adaptive power control
The ISL3871 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.
• 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
Built-in flexibility allows the ISL3871 to be configured
through a general purpose control bus, for a range of
applications. The ISL3871 is housed in either a thin plastic
BGA package or a TQFP flat pack suitable for PCMCIA
board applications.
• 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
The ISL3871 is designed to provide maximum performance
with minimum power consumption. External pin layout is
organized to provide optimal PC board layout to all user
interfaces including PCMCIA and USB.
Ordering Information
TEMP.
PACKAGE
PACKAGE
PART #
o
PART NUMBER RANGE ( C) DESCRIPTION
ISL3871IK18
-40 to 85
-40 to 85
-40 to 85
-40 to 85
192 BGA
V192.14x14
ISL3871IK18-TK
ISL3871IN18
Tape and Reel 1000 Units /Reel
208 LQFP Q208.28x28A
Tape and Reel 500 Units/Reel
ISL3871IN18-TS
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003. All Rights Reserved
PRISM® is a registered trademark of Intersil Americas Inc. PRISM and design is a trademark of Intersil Americas Inc.
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