72x
GND
INPUT
& V
ref
OUTPUT
& V
d
GND
3
4
1
2
Features
Lead-free Option Available
Operating Frequency: 0.1 GHz ~6.0 GHz
Noise Figure: 1.4 dB at 2 GHz
Gain: 14 dB at 2 GHz
Bypass Switch on Chip Loss = -2.5 dB (Id <5 µA)
IIP3 = +35 dBm
Adjustable Input IP3: +2 to +14 dBm
2.7 V to 4.2 V Operation
Very Small Surface Mount Package
Applications
CDMA (IS-95, J-STD-008) Receiver LNA Transmit
Driver Amp
TDMA (IS-136)Handsets
Surface Mount Package
SOT-343 (SC-70)
Description
Avago’s MGA-72543 is an economical, easy-to-use GaAs
MMIC Low Noise Ampli er (LNA),which is designed for an
adaptive CDMA receiver LNA and adaptive CDMA transmit
driver ampli er.
The MGA-72543 features a minimum noise gure of 1.4 dB
and 14 dB associated gain from a single stage, feedback
FET ampli er. The output is internally matched to 50Ω.
The input is optimally internally matched for lowest noise
gure into 50Ω. The input may be additionally externally
matched for low VSWR through the addition of a single
series inductor. When set into the bypass mode,both input
and output are internally matched to 50Ω.
The MGA-72543 o ers an integrated solution of LNA with
adjustable IIP
3
. The IIP
3
can be xed to a desired current
level for the receiver’s linearity requirements. The LNA has
a bypass switch function,which sets the current to zero
and provides low insertion loss. The bypass mode also
boosts dynamic range when high level signal is being
received.
For the CDMA driver ampli er applications, the MGA-
72543 provides suitable gain and linearity to meet the
ACPR requirements when the handset transmits the
highest power. When transmitting lower power, the MGA-
72543 can be bypassed, saving the drawing current.
The MGA-72543 is a GaAs MMIC, processed on Avago’s
cost e ective PHEMT (Pseudomorphic High Electron Mo-
bility Transistor). It is housed in the SOT343 (SC70 4-lead)
package, and is part of the Avago Technologies CDMAd-
vantage RF chipset.
Pin Connections and Package Marking
Package marking is 3 characters. The last
character represents date code.
Attention:
Observe precautions for
handling electrostatic sensitive devices.
ESD Machine Model (Class A)
ESD Human Body Model (Class 0)
Refer to Avago Application Note A004R:
Electrostatic Discharge Damage and Control.
MGA-72543
PHEMT* Low Noise Ampli er with Bypass Switch
Data Sheet
*Pseudomorphic High Electron Mobility Transistor
