Rainbow Electronics MAX2659 User Manual
General Description
The MAX2659 high-gain, low-noise amplifier (LNA) is
designed for GPS, Galileo, and GLONASS applications.
Designed in Maxim’s advanced SiGe process, the
device achieves a 20.5dB gain and an ultra-low-noise
figure of 0.8dB while maximizing the input-referred 1dB
compression point and the 3rd-order intercept point at 12dBm and -5dBm, respectively.
The MAX2659 operates from a +1.6V to +3.3V single
supply and consumes only 4.1mA. The shutdown feature in the device reduces the supply current to be less
than 1µA. The MAX2659 is available in a very small,
lead-free, RoHS-compliant, 1.5mm x 1.0mm x 0.75mm,
6-pin µDFN package.
.
Applications
Automotive Navigation
Location-Enabled Mobile Devices
Telematics (Asset Tracking and Management)
Personal Navigation Device (PND)
Cellular Phones with GPS
Notebook PC/Ultra-Mobile PC
Recreational, Marine Navigation
Avionics
Features
o High-Power Gain: 20.5dB
o Ultra-Low-Noise Figure: 0.8dB
o Integrated 50Ω Output Matching Circuit
o Low Supply Current: 4.1mA
o Wide Supply Voltage Range: 1.6V to 3.3V
o Low Bill of Materials
o Small Footprint: 1.5mm x 1.0mm
o Thin Profile: 0.75mm
o Lead-Free and RoHS-Compliant Package
MAX2659
GPS/GNSS Low-Noise Amplifier
________________________________________________________________
Maxim Integrated Products
1
Pin Diagram/Functional Diagram/Typical Application Circuit
Ordering Information
19-0797; Rev 0; 4/07
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.
+
Denotes a lead-free package.
PART TEMP RANGE PIN-PACKAGE
PKG
CODE
MAX2659ELT+ -40°C to +85°C 6 µDFN L611-2
EVALUATION KIT
AVAILABLE
+
MAX2659
GND
1
GND
2
RF
INPUT
C1
RFIN
L1
3
BIAS
L1 = 6.8nH
C1 = 470pF
C2 = 33nF
RFOUT
6
SHDN
5
V
CC
4
RF
OUTPUT
LOGIC
CONTROL
V
CC
C2
MAX2659
GPS/GNSS Low-Noise Amplifier
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(MAX2659 EV kit; VCC= 1.6V to 3.3V, TA= -40°C to +85°C, no RF signals are applied. Typical values are at VCC= 2.85V and
T
A
= +25°C, unless otherwise noted.) (Note 1)
Stresses 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.
Note 1: Min and Max limits guaranteed by test at TA= +25°C and guaranteed by design and characterization at TA= -40°C and
T
A
= +85°C.
Note 2: Guaranteed by design and characterization.
Note 3: Measured with the two tones located at 5MHz and 10MHz offset from the center of the GPS band with -40dBm/tone.
Note 4: Measured with a tone located at 5MHz offset from the center of the GPS band.
V
CC
to GND...........................................................-0.3V to +4.2V
Other Pins to GND....................-0.3V to + Operating V
CC
+ 0.3V
Maximum RF Input Power .............................................+10dBm
Continuous Power Dissipation (T
A
= +70°C)
6-Pin µDFN (derates 2.1mW/°C above +70°C)............167mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+260°C
AC ELECTRICAL CHARACTERISTICS
(MAX2659 EV kit; VCC= 1.6V to 3.3V, TA= -40°C to +85°C, f
RFIN
= 1575.42MHz. Typical values are at VCC= 2.85V and TA= +25°C,
unless otherwise noted.) (Note 1)
CAUTION! ESD SENSITIVE DEVICE
Supply Voltage 1.6 2.85 3.3 V
Supply Current
Digital Input-Logic High 1.4 V
Digital Input-Logic Low 0.4 V
Digital Input Current 1 µA
PARAMETER CONDITIONS MIN TYP MAX UNITS
SHDN = high 4.1 5.6 mA
Shutdown mode, SHDN = low 1 µA
PARAMETER CONDITIONS MIN TYP MAX UNITS
RF Frequency L1 band 1575.42 MHz
Power Gain
Noise Figure (Note 2) 0.8 dB
3rd-Order Input Intercept Point (Note 3) -5 dBm
Input 1dB Compression point (Note 4) -12 dBm
Input Return Loss (Note 2) 10 15 dB
Output Return Loss (Note 2) 10 25 dB
Reverse Isolation (Note 2) 32 dB
VCC = 2.85V 17 20.5
= 1.6V 16.5 20.5
V
CC
dB
MAX2659
GPS/GNSS Low-Noise Amplifier
_______________________________________________________________________________________
3
Typical Operating Characteristics
(MAX2659 EV kit; Typical values are at VCC= 2.85V, TA= +25°C, and f
RFIN
= 1575.42MHz, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
4.5
+85°C
4.3
4.1
3.9
SUPPLY CURRENT (mA)
3.7
3.5
1.6 1.8 2.0 3.4
SUPPLY VOLTAGE (V)
+25°C
-40°C
2.8
NOISE FIGURE vs. TEMPERATURE
1.2
1.0
0.8
25
20
MAX2659 toc01
15
10
GAIN (dB)
5
0
-5
MAX2659 toc04
-10
1.2
1.0
0.8
3.0 3.22.62.42.2
GAIN vs. RF FREQUENCY
500 2500
RF FREQUENCY (MHz)
NOISE FIGURE vs. SUPPLY VOLTAGE
21.0
MAX2659 toc02
20.8
20.6
GAIN (dB)
20.4
20.2
MAX2659 toc05
20.0
-5
-10
2000 225017501250 1500750 1000
GAIN vs. SUPPLY VOLTAGE
1.6 3.43.2
SUPPLY VOLTAGE (V)
2.8 3.02.62.2 2.41.8 2.0
INPUT RETURN LOSS
vs. RF FREQUENCY
0
MAX2659 toc03
MAX2659 toc06
0.6
NOISE FIGURE (dB)
0.4
0.2
0
-40 85
TEMPERATURE (°C)
35 6010-15
OUTPUT RETURN LOSS
vs. RF FREQUENCY
0
-5
-10
-15
-20
-25
-30
-35
OUTPUT RETURN LOSS |S22| (dB)
-40
-45
500 2000 22501500750 2500
RF FREQUENCY (MHz)
175012501000
0.6
NOISE FIGURE (dB)
0.4
0.2
0
1.6 3.0 3.22.62.21.8 3.4
-20
-30
MAX2659 toc07
-40
-50
-60
REVERSE ISOLATION |S12| (dB)
-70
-80
500 2000 22501500750 2500
2.82.42.0
SUPPLY VOLTAGE (V)
REVERSE ISOLATION
vs. RF FREQUENCY
175012501000
RF FREQUENCY (MHz)
-15
-20
INPUT RETURN LOSS |S11| (dB)
-25
-30
500 2000 22501500750 2500
-3.5
TWO TONES LOCATED AT 5MHz AND
10MHz OFFSET WITH -40dBm/TONE
-4.0
MAX2659 toc08
-4.5
-5.0
IIP3 (dBm)
-5.5
-6.0
-6.5
-40 60 85
175012501000
RF FREQUENCY (MHz)
IIP3 vs. TEMPERATURE
MAX2659 toc09
3510-15
TEMPERATURE (°C)
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