LX5551

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 & SPDT for 11b/g/n

TM

®

Copyright

© 2008

Rev. 1.0, 2008-12-17

DESCRIPTION

LX5551

is

a

high-performance

WLAN front-end module (FEM) for

802.11b/g/n and other applications in

the

2.4-2.5GHz

frequency

range.

LX5551

integrates

an

advanced

InGaP/GaAs

Heterojunction

Bipolar

Transistor (HBT) power amplifier with

both input/output impedance matching,

and an InGaAs pseudomorphic HEMT

(pHEMT) switch, into a single 3x3mm

package.

The Tx path of LX5551 features a

two-stage

monolithic

microwave

integrated

circuit

(MMIC)

power

amplifier with active bias circuitry, and

50

Ω input/output matching inside the

package. With 3.3V supply voltage and

90mA nominal bias current, the Tx

path provides 27dB gain and +18dBm

linear output power, with extremely low

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

OFDM. Both gain and power are

readily measured at antenna port, with

switch insertion loss included.

The Rx path of LX5551 includes a

low-cost SPDT switch with excellent

insertion loss and isolation. It features a

very

low

Tx-to-Rx

port

leakage

in

receive mode.

LX5551 is available in a 16-pin,

3x3mm micro-lead package (MLPQ-

16L).

With its best-class performance

and compact footprint, LX5551 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

implementation.

KEY FEATUR ES

2.4-2.5GHz 11b/g/n Front-End

Solution in a Single 3x3mm

MLP Package

All RF Ports Matched to 50

Ω

Single-Polarity 3.3V Supply

Tx Path Power Gain ~ 27dB

Rx Path Loss ~ 0.6dB

Pout ~ +18dBm at Antenna* for

EVM = 3%

Total Current ~140mA for

+18dBm with 90% Duty Cycle

Pout > +22dBm for 11b 1Mbps

DSSS Mask Compliance

Small Footprint: 3x3mm

2

Low Profile: 0.9mm

RoHS Compliant & Pb-Free

* Including SPDT switch loss

APPLI C ATION S

IEEE 802.11b/g

IEEE 802.11n MIMO

BLOCK DIAGRAM

Vref

TxIn

Antenna

Vc

Det

Internal

OMN*

Ctl1 Ctl2

RxOut

*OMN: Output Matching Network

Vref

TxIn

Antenna

Vc

Det

Internal

OMN*

Ctl1 Ctl2

RxOut

Vref

TxIn

Antenna

Vc

Det

Internal

OMN*

Ctl1 Ctl2

RxOut

*OMN: Output Matching Network