PRISM - Intersil Corporation

File Number 4063.6

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

PRISM is a registered trademark of Intersil Corporation. PRISM and design is a trademark of Intersil Corporation.

PRISM® 2.4GHz Chip Set

Direct Sequence Spread Spectrum

Wireless Transceiver Chip Set

The Intersil 2.4GHz PRISM® chip set

is a highly integrated six-chip solution

f or RF modems emplo ying Direct

Sequence Spread Spectrum (DSSS)

signaling. Significant integration of tr ansmit and receiv e

functions emplo y the f ollo wing ICs: complete integr ated DSSS

engine, the HFA3824; a quadrature modulator/ demodulator,

integrated with an IF limiter amplifier with RSSI, the HFA3724,

HFA3726; a combined LNA/Mixer and

upconv erter/preamplifier , the HFA3624; a high performance,

low noise amplifier f or 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.

The PRISM chip set is intended to support various data rates

including systems targeting the proposed IEEE 802.11

standard “Direct Sequence Ph ysical layer (DS-PHY)”.

Diff erential BPSK and QPSK signaling is employed with

diff erential encoding and decoding of packetized data. A PN

sequence rate of up to 22MCPS is supported f or up to a 16

chip PN code. Integr ated prog r ammable low pass filters are

used on the HFA3724 to allow chip rates from 2.75MCPS to

22MCPS. A flexible general purpose data and control

interf ace is pro vided for parameter configuration and f or

transferring data packets between the PHY and Media Access

Control (MA C) layers. Data rates of up to 2MBPS for DBPSK

and 4MBPS f or DQPSK are supported.

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 4MBPS 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

Typical Application Diagram

QUAD IF MODULATOR

RFPA

HFA3925

HFA3724, HFA3726

DSSS BASEBAND PROCESSOR

DATA TO MACCTRL

HFA3824

TUNE/SELECT

HFA3524/A

0o/90o

VCO

A/D

MAC-PHY

INTERFACE

802.11

VCO

DUAL SYNTHESIZER

HFA3624

UP/DOWN

CONVERTER A/D

(FILE# 4067, 4310) (FILE# 4308)

(FILE# 4062)

(FILE# 4066)

(FILE# 4132)

PRISM CHIP SET FILE #4063

DPSK

DEMOD

DPSK

MOD.

DE-

SPREAD

HFA3424 (NOTE)

(FILE# 4131)

NOTE: Required for systems targeting 802.11 speciﬁcations.

CCA

RXI

RXQ

RSSI

TXI

TXQ

÷2

Antenna to Bits™ is a trademark of Intersil Corporation.

Data Sheet August 1997

[ /Title

(PRIS

2.4GH

z Chip

Set)

/Sub-

ject

(Direct

Sequen

Spread

Spec-

trum

Wire-

less

Trans-

ceiver

Chip

Set)

/Autho

r ()

/Key-

words

(Inter-

sil

Corpo-

ration,

semi-

con-

ductor,

PRIS

Wire-

less

Com-

muni-

cations

, RF,

All Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems.

Intersil Corporation’s quality certiﬁcations can be viewed at website www.intersil.com/quality/iso.asp.

Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without notice.

Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. How-

ever, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use.

No license is granted b y implication or otherwise under an y patent or patent rights of Intersil or its subsidiaries.

For information regarding Intersil Corporation and its products, see web site www.intersil.com

Sales Ofﬁce Headquarters

NORTH AMERICA

Intersil Corporation

P. O. Box 883, Mail Stop 53-204

Melbourne, FL 32902

TEL: (321) 724-7000

FAX: (321) 724-7240

EUROPE

Intersil SA

Mercure Center

100, Rue de la Fusee

1130 Brussels, Belgium

TEL: (32) 2.724.2111

FAX: (32) 2.724.22.05

ASIA

Intersil Ltd.

8F-2, 96, Sec. 1, Chien-kuo North,

Taipei, Taiwan 104

Republic of China

TEL: 886-2-2515-8508

FAX: 886-2-2515-8369

Typical 802.11 DS-PHY System Level Performance (Note 5) (Measured at a diversity antenna port)

Receiver

• Frequency Range. . . . . . . . . . . . . . .2.4GHz - 2.4835GHz

• Step Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1MHz

• Cascaded Noise Figure . . . . . . . . . . . . . . . . . . . . . .6.8dB

• Sensitivity . . . . . . . . -93dBm, 1MBPS, 8E-2 FER (Note 1)

-90dBm, 2MBPS, 8E-2 FER (Note 1)

• Input Intercept Point . . . . . . . . . . . . . . . . . . . . . . . -17dBm

• IF Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280MHz

• IF Bandwidth. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17MHz

• Image Rejection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80dB

• Adjacent Channel Rejection . . . . . . . . . . . . . . . . . . >35dB

• Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . .2.7V - 5.5V

Transmitter

• Frequency Range . . . . . . . . . . . . . .2.4GHz - 2.4835GHz

• Step Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1MHz

• Output Power . . . . . . . . . . . . . . . . . . . . . . . . . . . .+18dBm

• Spurious Outputs . . . . . . . . . . . . . . Targeting ISM/802.11

• Transmit Spectral Mask . . . . . . -32dBr at First Side-Lobe

• IF Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280MHz

• Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . .2.7V - 5.5V

General Speciﬁcations

• Targeted Standard . . . . . . . . . . . . . . . . . . . . .IEEE 802.11

• Data Rate. . . . . . . . . . . . . . . . . . . . . . . . . 1MBPS DBPSK

2MBPS DQPSK

• Range. . . . . . . . . . . . . . . . . . . . . . . . 400ft Indoor (Note 2)

3700ft Outdoor (Note 2)

• RX/TX Switching Speed. . . . . . . . . . . . . . . . . . . . . . . .2µs

• Power Savings Modes

- Mode 1: 190mA at 1µs Recovery (Notes 3, 4)

- Mode 2: 70mA at 25µs Recovery (Notes 3, 4)

- Mode 3: 60mA at 2ms Recovery (Notes 3, 4)

- Mode 4: 30mA at 5ms Recovery (Notes 3, 4)

• Average Current

(Without Power Savings Modes) . . . . . . . 298mA (Note 6)

• Average Current

(With Power Savings Modes) . . . . . . . . . . . 60mA (Note 7)

NOTES:

1. FER = Frame Error Rate or Packet Error Rate.

2. Range Test using AND-C-107 omnidirectional antenna.

3. Supply current includes AM79C930 MAC Processor.

4. Recovery time is for the PRISM 2.4GHz Chip Set only and does

not include programming latency of the AM79C930 MAC

Processor.

5. Refer to Application Note AN9624 for more information on the

“PRISM DSSS PC Card Wireless LAN Description”.

6. Based on average current consumption for “typical” application.

7. Power savings modes refer to AN9665. Average radio current

consumption for “typical” application.

PRISM 2.4GHz Chip Set