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MAX2655EXT-T ,1575MHz/1900MHz Variable-IP3 Low-Noise AmplifiersApplications6 SC70-6MAX2654EXT-T -40°C to +85°C AAI6 SC70-6MAX2655EXT-T -40°C to +85°C AAJGPS Recei ..
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MAX2654EXT-T-MAX2655EXT-T
1575MHz/1900MHz Variable-IP3 Low-Noise Amplifiers
General DescriptionThe 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 50Ω,
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.
________________________ApplicationsGPS Receivers
GPS Receivers in Cellular Phones
DCS/PCS Cellular Phones
Satellite Phones
Wireless Local Loop
FeaturesLow Noise Figure
MAX2654: 1.5dB at 1575MHz
MAX2655: 1.45dB at 1575MHz
MAX2656: 1.9dB at 1960MHzHigh Gain
MAX2654: 15.1dB at 1575MHz
MAX2655: 14.1dB at 1575MHz
MAX2656: 13.5dB at 1960MHz12.7dB Gain Step (MAX2656 only)Integrated 50ΩOutput MatchingVariable IP3 Set by One Bias Resistor
(MAX2655/MAX2656 only)0.1µA Shutdown Mode (MAX2654/MAX2655 only)+2.7V to +5.5V Single-Supply OperationUltra-Small 6-Pin SC70 Package
MAX2654/MAX2655/MAX2656
1575MHz/1900MHz Variable-IP3
Low-Noise Amplifiers
Pin Configuration
Typical Operating Circuit19-1872; Rev 1; 4/02
Ordering Information
MAX2654/MAX2655/MAX2656
1575MHz/1900MHz Variable-IP3
Low-Noise Amplifiers
ABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VCCto GND .............................................................-0.3V to +6V
RF Input Power.................................................................+5dBm
Continuous Power Dissipation (TA= +70°C)
6-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW
Operating Temperature Range...........................-40°C to +85°C
Maximum Junction Temperature.....................................+150°C
Storage Temperature.........................................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
DC ELECTRICAL CHARACTERISTICS(VCC = +2.7V to +5.5V, RBIAS= 511Ω±1%, TA= -40°C to +85°C. No RF signal applied. RFIN is AC-coupled and terminated to 50Ω.
RFOUT is unconnected. Typical values are at VCC= +3V, TA= +25°C, unless otherwise noted.) (Note 1)
MAX2654/MAX2655/MAX2656
1575MHz/1900MHz Variable-IP3
Low-Noise Amplifiers
AC ELECTRICAL CHARACTERISTICS (MAX2654)(MAX2654 Evaluation Kit, VCC= +3.0V, PIN= -30dBm, fIN = 1575MHz, VRFOUT = VCCthrough a 10kΩresistor, TA= +25°C. Typical
values are at VCC= +3V, TA= +25°C, unless otherwise noted.) (Note 6)
AC ELECTRICAL CHARACTERISTICS (MAX2655)(MAX2655 Evaluation Kit, VCC= +3.0V, PIN= -30dBm, fIN = 1575MHz, VRFOUT = VCCthrough a 10kΩresistor, RBIAS= 511Ω±1%,
MAX2654/MAX2655/MAX2656
1575MHz/1900MHz Variable-IP3
Low-Noise Amplifiers
AC ELECTRICAL CHARACTERISTICS (MAX2656)(MAX2656 Evaluation Kit, VCC= +3V, PIN= -30dBm, fIN = 1960MHz, VRFOUT = GND through a 12kΩresistor, RBIAS= 511Ω±1%, TA
= +25°C. Typical valuesare at VCC= +3V, TA= +25°C, unless otherwise noted.) (Note 6)
Note 1:Devices are production tested at TA= +25°C. Minimum and maximum values are guaranteed by design and characteriza-
tion over temperature and supply voltages to ±6 sigma.
Note 2:Minimum DC voltage through a 10kΩresistor that sets the MAX2654/MAX2655 to operate in normal mode and MAX2656 in
low-gain mode.
Note 3:Maximum DC voltage through a 10kΩresistor that sets the MAX2654/MAX2655 to operate in shutdown mode and
MAX2656 in high-gain mode.
Note 4:DC current required when VRFOUTis connected to VCCthrough a 10kΩresistor.
Note 5:DC current required when VRFOUTis connected to GND through a 10kΩresistor.
Note 6:Guaranteed by design and characterization to ±3 sigma.
Note 7:The part has been characterized at the specified frequency range. Operation outside of this range is possible, but not
guaranteed.
Note 8:Production tested at TA= +25°C.
Note 9:Measured with two input tones, f1= 1570MHz, f2= 1580MHz, both at -30dBm per tone.
Note 10:Excludes PC board losses of 0.2dB for MAX2654/MAX2655 and 0.25dB for MAX2656.
Note 11:High-gain mode is set up by connecting RFOUT to GND through a 12kΩresistor.
Note 12:Low-gain mode is set up by connecting RFOUT to VCCthrough a 12kΩresistor.
Note 13:Measured with two input tones, f1= 1955MHz, f2= 1965MHz, both at -30dBm per tone.
MAX2654/MAX2655/MAX2656
1575MHz/1900MHz Variable-IP3
Low-Noise Amplifiers
Typical Operating Characteristics(PIN= -30dBm, input and output are terminated to 50Ω, VCC= +3V, high-gain and low-gain modes are applicable only to the MAX2656,= +25°C, unless otherwise noted.)
MAX2654
INPUT IP3 vs. TEMPERATURE
MAX2654 toc06
INPUT IP3 (dBm)
-402040-2006080
MAX2654/MAX2655/MAX2656
1575MHz/1900MHz Variable-IP3
Low-Noise Amplifiers
MAX2655
SUPPLY CURRENT vs. SUPPLY VOLTAGEMAX2655 toc18
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
Typical Operating Characteristics (continued)
(PIN= -30dBm, input and output are terminated to 50Ω, VCC= +3V, high-gain and low-gain modes are applicable only to the MAX2656,= +25°C, unless otherwise noted.)
MAX2654/MAX2655/MAX2656
1575MHz/1900MHz Variable-IP3
Low-Noise Amplifiers
Typical Operating Characteristics (continued)(PIN= -30dBm, input and output are terminated to 50Ω, VCC= +3V, high-gain and low-gain modes are applicable only to the MAX2656,= +25°C, unless otherwise noted.)
MAX2655
SUPPLY CURRENT vs. RBIASMAX2655 toc19
SUPPLY CURRENT (mA)
RBIAS (Ω)
MAX2655
SHUTDOWN CURRENT vs. TEMPERATURETEMPERATURE (°C)
SHUTDOWN CURRENT (nA)
-40020-20406080
