TM

2-1

File Number

4634.5

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

1-888-INTERSIL or 321-724-7143

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HFA3683A

2.4GHz RF/IF Converter and Synthesizer

The HFA3683A is a monolithic SiGe

half-duplex RF/IF transceiver designed

to operate in the 2.4GHz ISM band.

The receive chain features a low noise,

gain selectable amplifier (LNA) followed

by a down-converter mixer. An up-converter mixer and a

high performance preamplifier compose the transmit chain.

The remaining circuitry comprises a high frequency Phase

Locked Loop (PLL) synthesizer with a three wire

programmable interface for local oscillator applications.

A reduced filter count is realized by multiplexing the receive

and transmit IF paths and by sharing a common differential

matching network. Furthermore, both transmit and receive

RF amplifiers can be directly connected to mixers. The

inherent image rejection of both the transmit and receive

functions allow this economic advantage.

The HFA3683A is housed in a 64 lead TQFP package well

suited for PCMCIA board applications.

Simplified Block Diagram

Features

• Highly Integrated

• Multiplexed RX/TX IF Path Utilizes Single IF Filter

• Programmable Synthesizer

• Gain Selectable LNA

• Power Management/Standby Mode

• Single Supply 2.7V to 3.3V Operation

Cascaded LNA/Mixer (High Gain)

• Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25dB

• SSB Noise Figure. . . . . . . . . . . . . . . . . . . . . . . . . . . 3.7dB

• Input IP3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -13dBm

• IF Frequency . . . . . . . . . . . . . . . . . . . 280MHz to 600MHz

Cascaded LNA/Mixer (Low Gain)

• Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -5dB

• Input P1dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +2.5dBm

• IF Frequency . . . . . . . . . . . . . . . . . . . 280MHz to 600MHz

Cascaded Mixer/Preamplifier

• Transmit Cascaded Mixer/Preamplifier Gain . . . . . . .25dB

• SSB Noise Figure. . . . . . . . . . . . . . . . . . . . . . . . . . . .10dB

• Output P1dB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4dBm

• IF Frequency . . . . . . . . . . . . . . . . . . . 280MHz to 600MHz

Applications

• IEEE802.11 1MBPS and 2MBPS Standard

• Systems Targeting IEEE802.11, 11MBPS Standard

• Wireless Local Area Networks

• PCMCIA Wireless Transceivers

• ISM Systems

• TDMA Packet Protocol Radios

Ordering Information

PART

NUMBER

TEMP. RANGE

PACKAGE

PKG. NO.

HFA3683AIN

-40 to 85

64 Ld TQFP

Q64.10x10

HFA3683AIN96

-40 to 85

Tape and Reel

RX_MX_OUT

PLL

MODULE

LO_IN

RX_IN

INTERFACE

TXA_OUT

REF_IN

TX_MX_IN

CP_DO

Data Sheet

June 2000