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Maxim Integrated - 1575MHz/1900MHz Variable-IP3 Low-Noise Amplifiers

Numéro de référence MAX2654
Description 1575MHz/1900MHz Variable-IP3 Low-Noise Amplifiers
Fabricant Maxim Integrated 
Logo Maxim Integrated 





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MAX2654 fiche technique
19-1872; Rev 1; 4/02
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1575MHz/1900MHz Variable-IP3
Low-Noise Amplifiers
General Description
The MAX2654/MAX2655/MAX2656 high third-order
intercept point (IP3), low-noise amplifiers (LNAs) are
designed for applications in GPS, PCS, WLL, and satel-
lite phone systems. The MAX2654/MAX2655/MAX2656
incorporate on-chip internal output matching to 50,
eliminating the need for external matching components.
A shutdown feature in the MAX2654/MAX2655 reduces
the 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 applica-
tions 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 a
+2.7V to +5.5V single supply and are available in the
miniature 6-pin SC70 package.
________________________Applications
GPS Receivers
GPS Receivers in Cellular Phones
DCS/PCS Cellular Phones
Satellite Phones
Wireless Local Loop
Pin Configuration
BIAS (GND) 1
GND 2
RFIN 3
MAX2654
MAX2655
MAX2654
6 RFOUT
5 GND
4 VCC
ARE FOR MAX2654 ONLY
SC70-6
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 50Output 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
PART
TEMP
RANGE
PIN-
PACKAGE
MAX2654EXT-T
MAX2655EXT-T
MAX2656EXT-T
-40°C to +85°C
-40°C to +85°C
-40°C to +95°C
6 SC70-6
6 SC70-6
6 SC70-6
SOT
TOP-
MARK
AAI
AAJ
AAK
Typical Operating Circuit
VCC = +3V
MAX2655
MAX2656
1
RFIN
C1
RBIAS
L1
C2
3
4 Cb
BIAS
VCTRL/GND
10k
6
RFOUT
( ) ARE FOR MAX2654 ONLY
(1)
25
PART
MAX2654
MAX2655
MAX2656
FREQUENCY
1575
1575
1960
L1 (nH)
5.6
5.6
4.7
C1 (pF)
6
1800
1800
C2 (pF)
1.6
1.5
1.2
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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