Intersil Corporation HFA3424 Datasheet

HFA3424

Data Sheet January 1997 File Number

2.4GHz - 2.5GHz Low Noise Amplifier

™

The Intersil 2.4GHz PRISM™ chip set is
a highly integrated five-chip solution for
RF modems employing Direct
Sequence Spread Spectrum (DSSS)
signaling. The HF A3424 2.4GHz -

2.5GHz low noise amplifier is an optional chip that can be
added to the five chips in the PRISM™ chip set. The
HF A3424 offers increased sensitivity for systems targeting

802.11 specifications. (See Figure 1, the Typical Application
Diagram.)

The Intersil HFA3424 PRISM™ is a high performance low
noise amplifier in a low cost SOIC 8 lead surface mount
plastic package. The HFA3424 employs a fully monolithic
design which eliminates the need for external tuning
networks. It can be biased using 3V or 5V supplies and has
an option for biasing at higher currents for increased
dynamic range.

The HFA3424 is ideally suited for use where low noise
figure, high gain, high dynamic range and low power
consumption required. Typical applications include receiver
front ends in the Wireless Local Area Network (WLAN) and
wireless data collection markets in the 2.4GHz Industrial,
Scientific and Medical (ISM) band, as well as standard gain
blocks, buffer amps, driver amps and IF amps in both fixed
and portable systems.

4131.2

Features

• Low Noise Figure . . . . . . . . . . . . . . . . . . . . . . . . . . 1.90dB

• High Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14dB

• Low Power Consumption . . . . . . . . . . . . . . 3V to 5V, 5mA

• High Dynamic Range

• DC Decoupled RF Input and Output

• No External RF Tuning Elements Necessary

• Low Cost SOIC 8 Lead Plastic Package

Applications

• Systems Targeting IEEE 802.11 Standard

• TDD Quadrature-Modulated Communication
Systems

• Wireless Local Area Networks

• PCMCIA Wireless Transceivers

• ISM Systems

• TDMA Packet Protocol Radios

• PCS/Wireless PBX

• Wireless Local Loop

Ordering Information

TEMP.

PART NUMBER

HFA3424IB -40 to 85 8 Ld SOIC M8.15
HFA3424IB96 -40 to 85 Tape and Reel

RANGE (oC) PACKAGE

PKG.

NO.

Pinout

GND

V

BIAS

RF IN

GND

1
2
3
4

HFA3424

(SOIC)

TOP VIEW

2-7

8
7
6
5

Functional Block Diagram

V

DD

RF OUT

GND
V

DD

RF OUT
GND

EXTENDED

BIAS

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

http://www.intersil.com or 407-727-9207

PRISM® is a registered trademark of Intersil Corporation. PRISM logo is a trademark of Intersil Corporation.

LNA 1

RF IN

| Copyright © Intersil Corporation 1999

Typical Application Diagram

HFA3424

HFA3724

(FILE# 4067)

HF A3424 (NOTE)

(FILE# 4131)

HF A3624

UP/DOWN

CONVERTER

(FILE# 4066)

RFPA

HF A3925

VCO

VCO

(FILE# 4132)

DUAL SYNTHESIZER

HFA3524

(FILE# 4062)

FIGURE 1. TYPICAL TRANSCEIVER AMPLIFIER APPLICATIONS CIRCUIT USING THE HFA3424

NOTE: Required for systems targeting 802.11 specifications.

For additional information on the PRISM™ chip set, call
[phone]toaccessIntersil’AnswerFAX system. When
prompted, key in the four-digit document number (File #) of
the datasheets you wish to receive.

÷2

0o/90

QUAD IF MODULATOR

The four-digit file numbers are shown in Typical Application
Diagram, and correspond to the appropriate circuit.

TUNE/SELECT

I

M

o

U
X

Q

HSP3824

(FILE# 4064)

RXI

RXQ

RSSI

M
U
X

A/D

DE-

SPREAD

A/D

CCA

A/D

TXI

SPREAD

TXQ

DSSS BASEBAND PROCESSOR

PRISM™ CHIP SET FILE #4063

DPSK

DEMOD

802.11

MAC-PHY

INTERFACE

DPSK

MOD.

DATA TO MACCTRL

2-8