PRISM - Harris Semiconductor

SEMICONDUCTOR

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 4 MBPS 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

Description

The Harris 2.4GHz PRISM™ chip

set is a highly integrated ﬁve-chip

solution f or RF modems emplo ying

Direct Sequence Spread Spectrum

(DSSS) signaling. Signiﬁcant integration of transmit and receive

functions employ the following ICs: complete integrated DSSS

engine, the HFA3824; a quadrature modulator/demodulator,

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

HFA3726; a combined LNA/Mixer and upconverter/preampli-

ﬁer, the HFA3624; a high performance, low noise ampliﬁer for

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 combi-

nation 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 Physical layer (DS-PHY)”. Differ-

ential BPSK and QPSK signaling is employed with differen-

tial encoding and decoding of packetized data. A PN

sequence rate of up to 22 MCPS is suppor ted for up to a 16

chip PN code. Integrated programmable low pass ﬁlters are

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

22 MCPS. A ﬂexible general purpose data and control inter-

face is provided for parameter conﬁguration and for transfer-

ring data packets between the PHY and Media Access

Control (MAC) layers. Data rates of up to 2 MBPS for

DBPSK and 4 MBPS for DQPSK are supported.

Typical Application Diagram

PRISM™, the PRISM™ logo and Antenna-to-Bits™ are trademarks of Harris Corporation.

QUAD IF MODULATOR

RFPA

HFA3925

HFA3724, HFA3726

DSSS BASEBAND PROCESSOR

DATA TO MACCTRL

HFA3824

TUNE/SELECT

HFA3524

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

August 1997

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

PRISM™

2.4GHz Chip Set

Direct Sequence Spread Spectrum

Wireless Transceiver Chip Set

File Number 4063.6

All Harris Semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certiﬁcation.

Harris Semiconductor products are sold by description only. Harris Semiconductor reser ves 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 Harris is

believed to be accurate and reliable. However, no responsibility is assumed by Harris 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 gr anted b y implication or otherwise under any patent or patent rights of Harris or its subsidiaries.

Sales Ofﬁce Headquarters

For general information regarding Harris Semiconductor and its products, call 1-800-4-HARRIS

NORTH AMERICA

Harris Semiconductor

P. O. Box 883, Mail Stop 53-210

Melbourne, FL 32902

TEL: 1-800-442-7747

(407) 729-4984

FAX: (407) 729-5321

EUROPE

Harris Semiconductor

Mercure Center

100, Rue de la Fusee

1130 Brussels, Belgium

TEL: (32) 2.724.2111

FAX: (32) 2.724.22.05

ASIA

Harris Semiconductor PTE Ltd.

No. 1 Tannery Road

Cencon 1, #09-01

Singapore 1334

TEL: (65) 748-4200

FAX: (65) 748-0400

SEMICONDUCTOR

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

-90dBm, 2 MBPS, 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 . . . . . . . . . . . . . . . . . . . . . . . . 1 MBPS DBPSK

2 MBPS 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