LX5541
P
RODUCTION
D
AT A
S
HEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
WWW.
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Co-Package 2.3 – 2.5 GHz HBT Power Amp +
pHEMT Low Noise Amplifier + SPDT Switch
TM
®
Copyright
2006
Rev. 1.3, 2008-02-11
D E S C R I P T I O N
D E S C R I P T I O ND E S C R I P T I O N
D E S C R I P T I O N
LX5541 is a co-package RFIC
consisting of an InGaP/GaAs
Heterojunction Bipolar Transistor
(HBT) power amplifier, an InGaAs
pseudomorphic HEMT (pHEMT) low
noise amplifier, and a SPDT switch.
All three RF devices are optimized for
WLAN applications in the 2.3 to 2.5
GHz frequency range.
The PA is implemented as a two-
stage monolithic microwave integrated
circuit (MMIC) with active bias and
output pre-matching. The LNA is fully
matched internally, and the LNA is
connected to the RX port of SPDT
switch directly inside the MLPQ
package.
Both PA and LNA operate with
single low voltage supply of 3.3V.
The PA (including SPDT switch loss)
offers 27 dB power gain between 2.3-
2.5GHz, at a low quiescent current of
90mA.
For 19dBm OFDM output power
(64QAM, 54Mbps) at the antenna port,
the PA including SPDT switch provides
a low EVM (Error-Vector Magnitude)
of about 3%, and consumes 145 mA
total DC current.
The LNA (including SPDT switch
loss) offers 13 dB gain, 2 dB noise
figure (switch contribution included)
and a high input IP3 of +5 dBm at 10
mA DC current.
LX5541 is available in a low profile
16-pin 3mmx3mm micro-lead package
(MLPQ-16L). LX5541 with a PA,
LNA and SPDT integrated in a small,
low profile, and low thermal resistance
package offers an ideal compact front
end solution for IEEE 802.11b/g/n
applications.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
K E Y F E A T U R E S
K E Y F E A T U R E SK E Y F E A T U R E S
K E Y F E A T U R E S
Small Footprint: 3x3mm
2
Low Profile: 0.45mm
2.3-2.5GHz Operation
Single-Polarity 3.3V
Supply
On-Chip Active Bias Circuit
for both PA and LNA
TX Features:
Input matched PA
Quiescent Current ~ 90mA
Power Gain ~ 27 dB *
Total Current ~
Pout=19 dBm OFDM *
EVM~3 % at 19dBm (2%
at 17dBm) 54Mbps/64QAM
RX Features:
LNA Gain ~ 13 dB *
LNA Noise Figure ~ 2 dB *
LNA Input IP3 ~ +5dBm *
LNA On-Chip Input/Output
Match
* Including SPDT switch loss
A P P L I C A T I O N S
A P P L I C A T I O N SA P P L I C A T I O N S
A P P L I C A T I O N S
IEEE 802.11b/g/n
B L O C K D I A
B L O C K D I A B L O C K D I A
B L O C K D I A G R A M
G R A MG R A M
G R A M
.
