LX5552

Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 1

2.4-2.5 GHz Front-End Module with Internally

Matched Power Amplifier, LNA & SPDT Switch

TM

®

Copyright

© 2009

Rev. 1.0, 2009-06-02

DESCRIPTION

LX5552 is a high-integration, high-

performance WLAN front-end module

(FEM) for 802.11b/g/n and other

applications

in

the

2.4-2.5GHz

frequency range. LX5552 integrates a

fully matched InGaP/GaAs Hetero-

junction Bipolar Transistor (HBT)

power amplifier, a low noise amplifier

based on InGaAs Enhancement mode

pseudo-morphic

high

electron

mobility

transistor

(E-pHEMT)

technology, and a low-cost Depletion

mode pHEMT (D-pHEMT) single

pole double throw (SPDT) antenna

switch in a single package.

The Tx path of LX5552 features a

two-stage

monolithic

microwave

integrated

circuit

(MMIC)

power

amplifier with active bias circuitry,

on-chip output power detector, and

50

Ω input/output matching inside the

package. With 3.3V supply voltage

and 80mA bias current, the Tx path

provides about 26dB power gain and

+17dBm linear output power, with low

total EVM (<3%) for 64QAM/ 54Mbps

OFDM. Both gain and power are

readily measured at antenna port with

the insertion loss of the Tx switch

included.

The Rx path of LX5552 features

small-signal gain of 12.5dB, low noise

figure of 2dB, and high input third-

order intercept point (IIP3) of +5dBm

with the insertion loss of the the Rx

switch

loss

included.

The

LNA

consumes about 10mA current with

3.3V supply voltage.

LX5552 is available in a 16-pin,

3x3mm micro-lead package (MLPQ-

16L). With its high level of functional

integration,

best-class

performance,

compact footprint and low profile,

LX5552

offers

an

ideal

front-end

solution for the ever demanding design

requirements

of

today’s

WLAN

systems,

including 802.11b/g and the

latest 11n MIMO applications.

KEY FEA T URES

2.4-2.5GHz 802.11b/g/n Front-

End Solution in a Single MLP

Package

All RF I/O Matched to 50

Ω

Single-Polarity 3.3V Supply

Small Footprint: 3x3mm

2

Low Profile: 0.55mm

RoHS Compliant & Pb-Free

TX Features :

Power Gain ~ 26dB*

Pout ~ +17dBm* for 3% EVM

Current ~140mA at +17dBm

Pout ~ +21dBm* for 11b

1Mbps DSSS Mask

Compliance

Quiescent Current ~ 80mA

RX Features :

Gain ~ 12.5dB*

Noise Figure ~ 2dB*

IIP3 ~ +5dBm*

* Including SPDT switch loss

A P P L IC A T IO N S

IEEE 802.11b/g

IEEE 802.11n MIMO

BLOCK DIAGRAM

*IMN:

Input Matching Network

*OMN:

Output Matching Network

Vref

TxIn

Antenna

Port

Vc1

Det

CtrlTx CtrlRx

Vdd

RxOut

IMN*

PA

PA

Out SwIn

OMN*

Vc2

LNA

*IMN:

Input Matching Network

*OMN:

Output Matching Network

Vref

TxIn

Antenna

Port

Vc1

Det

CtrlTx CtrlRx

Vdd

RxOut

IMN*

PA

PA

Out SwIn

OMN*

Vc2

LNA