19-1872; Rev 1; 4/02
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KIT MA
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FOLLO
1575MHz/1900MHz Variable-IP3
Low-Noise Amplifiers
The MAX2654/MAX2655/MAX2656 high third-order
intercept point (IP3), low-noise amplifiers (LNAs) are
designed for applications in GPS, PCS, WLL, and satellite phone systems. The MAX2654/MAX2655/MAX2656
incorporate on-chip internal output matching to 50Ω,
eliminating the need for external matching components.
A shutdown feature in the MAX2654/MAX2655 reduces
operating current to 0.1µA, eliminating the need for an
external supply switch.
The MAX2654 operates in the GPS frequency of
1575MHz with 15.1dB of gain, 1.5dB noise figure, and
only consumes 5.8mA. The MAX2655 is designed with
high-input IP3 to improve operation in cellular applications where the cellular power amplifier leaks into the
GPS receiver. The MAX2656 is designed for PCS
phone applications with 13.5dB of gain in high-gain
mode and 0.8dB of gain in low-gain mode (selected by
a logic control) and 1.9dB noise figure.
The IP3 of MAX2655/MAX2656 is adjustable by a single
external bias resistor (RBIAS), allowing supply current to
be optimized for a specific application.
The MAX2654/MAX2655/MAX2656 operate from +2.7V
to +5.5V single supply and are available in the miniature 6-pin SC70 package.
________________________Applications
Features
o Low Noise Figure
MAX2654: 1.5dB at 1575MHz
MAX2655: 1.45dB at 1575MHz
MAX2656: 1.9dB at 1960MHz
o High Gain
MAX2654: 15.1dB at 1575MHz
MAX2655: 14.1dB at 1575MHz
MAX2656: 13.5dB at 1960MHz
o 12.7dB Gain Step (MAX2656 only)
o Integrated 50Ω Output Matching
o Variable IP3 Set by One Bias Resistor
(MAX2655/MAX2656 only)
o 0.1µA Shutdown Mode (MAX2654/MAX2655 only)
o +2.7V to +5.5V Single-Supply Operation
o Ultra-Small 6-Pin SC70 Package
Ordering Information
TEMP.
RANGE
PART
PINPACKAGE
SOT
TOPMARK
MAX2654EXT-T
-40°C to +85°C
6 SC70-6
AAI
GPS Receivers
MAX2655EXT-T
-40°C to +85°C
6 SC70-6
AAJ
GPS Receivers in Cell Phones
MAX2656EXT-T
-40°C to +95°C
6 SC70-6
AAK
DCS/PCS Cell Phones
Typical Operating Circuit
Satellite Phones
Wireless Local Loop
VCC = +3.0V
Pin Configuration
Cb
4
MAX2655
MAX2656
1
VCTRL/GND
BIAS
RBIAS
TOP VIEW
10k
1
BIAS (GND)
2
L1
GND MAX2655 GND 5
RFOUT 6
RFIN
C1
MAX2654
6
RFOUT
3
C2
MAX2654
(1)
2
5
( ) IS FOR MAX2654 ONLY
3
VCC 4
RFIN
PART
FREQUENCY
L1(nH)
C1(pF)
C2(pF)
1575
5.6
6
1.6
1575
5.6
1800
1.5
MAX2656
SC70-6
MAX2654
MAX2655
( ) IS FOR MAX2654 ONLY
1960
4.7
1800
1.2
________________________________________________________________ Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX2654/MAX2655/MAX2656
General Description
