Maxim MAX2659 Gps/gnss low-noise amplifier Datasheet

19-0797; Rev 2; 9/09
KIT
ATION
EVALU
E
L
B
AVAILA
GPS/GNSS Low-Noise Amplifier
Features
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.
o High-Power Gain: 20.5dB
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.
o Low Bill of Materials
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 Small Footprint: 1.5mm x 1.0mm
o Thin Profile: 0.75mm
o Lead-Free and RoHS-Compliant Package
Applications
.
Automotive Navigation
Location-Enabled Mobile Devices
Ordering Information
Telematics (Asset Tracking and Management)
PART
Personal Navigation Device (PND)
TEMP RANGE
MAX2659ELT+
Cellular Phones with GPS
Notebook PC/Ultra-Mobile PC
Recreational, Marine Navigation
PIN-PACKAGE
-40°C to +85°C
6 μDFN
MAX2659ELT/V+
-40°C to +85°C
+Denotes a lead-free package.
/V denotes an automotive qualified part.
6 μDFN
Avionics
Pin Diagram/Functional Diagram/Typical Application Circuit
+
MAX2659
GND
GND
1
6
2
5
RFOUT
RF
OUTPUT
SHDN
LOGIC
CONTROL
VCC
RFIN
RF
INPUT
3
C1
BIAS
L1
4
VCC
C2
L1 = 6.8nH
C1 = 470pF
C2 = 33nF
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1
MAX2659
General Description
MAX2659
GPS/GNSS Low-Noise Amplifier
ABSOLUTE MAXIMUM RATINGS
VCC to GND ...........................................................-0.3V to +4.2V
Other Pins to GND....................-0.3V to + Operating VCC + 0.3V
Maximum RF Input Power .............................................+10dBm
Continuous Power Dissipation (TA = +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
CAUTION! ESD SENSITIVE DEVICE
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.
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
TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
Supply Voltage
Supply Current
MIN
TYP
1.6
2.85
3.3
V
4.1
5.6
mA
1
μA
SHDN = high
Shutdown mode, SHDN = low
Digital Input-Logic High
1.1
Digital Input Current
SHDN = high
UNITS
V
Digital Input-Logic Low
RFIN DC Voltage
MAX
0.4
V
1
μA
0.83
V
AC ELECTRICAL CHARACTERISTICS
(MAX2659 EV kit; VCC = 1.6V to 3.3V, TA = -40°C to +85°C, fRFIN = 1575.42MHz. Typical values are at VCC = 2.85V and TA = +25°C,
unless otherwise noted.) (Note 1)
PARAMETER
RF Frequency
Power Gain
CONDITIONS
MIN
L1 band
TYP
MAX
1575.42
VCC = 2.85V
17
20.5
VCC = 1.6V
16.5
20.5
UNITS
MHz
dB
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
Reverse Isolation
(Note 2)
25
dB
32
dB
Note 1: Min and Max limits guaranteed by test at TA = +25°C and guaranteed by design and characterization at TA = -40°C and
TA = +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.
2
_______________________________________________________________________________________
GPS/GNSS Low-Noise Amplifier
20
20.8
4.1
+25°C
3.9
-40°C
GAIN (dB)
15
GAIN (dB)
SUPPLY CURRENT (mA)
21.0
MAX2659 toc02
MAX2659 toc01
+85°C
4.3
GAIN vs. SUPPLY VOLTAGE
GAIN vs. RF FREQUENCY
25
MAX2659 toc03
SUPPLY CURRENT vs. SUPPLY VOLTAGE
4.5
10
5
20.6
20.4
0
3.7
20.2
-5
3.5
2.2 2.4 2.6 2.8 3.0 3.2 3.4
500 750 1000 1250 1500 1750 2000 2250 2500
1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4
SUPPLY VOLTAGE (V)
RF FREQUENCY (MHz)
SUPPLY VOLTAGE (V)
NOISE FIGURE vs. TEMPERATURE
NOISE FIGURE vs. SUPPLY VOLTAGE
INPUT RETURN LOSS
vs. RF FREQUENCY
0.4
0.2
0.6
0.4
0.2
0
-15
10
35
60
85
OUTPUT RETURN LOSS
vs. RF FREQUENCY
REVERSE ISOLATION
vs. RF FREQUENCY
-20
-25
-30
-35
MAX2659 toc06
500 750 1000 1250 1500 1750 2000 2250 2500
RF FREQUENCY (MHz)
IIP3 vs. TEMPERATURE
MAX2659 toc08
-3.5
-30
-4.0
TWO TONES LOCATED AT 5MHz AND
10MHz OFFSET WITH -40dBm/TONE
-4.5
-40
IIP3 (dBm)
-15
-20
REVERSE ISOLATION |S12| (dB)
MAX2659 toc07
-10
-20
3.0 3.2 3.4
SUPPLY VOLTAGE (V)
-5
-15
-30
1.6 1.8 2.0 2.2 2.4 2.6 2.8
TEMPERATURE (°C)
0
-10
-25
0
-40
-5
MAX2659 toc09
0.6
0.8
0
INPUT RETURN LOSS |S11| (dB)
0.8
MAX2659 toc05
1.0
NOISE FIGURE (dB)
1.0
NOISE FIGURE (dB)
1.2
MAX2659 toc04
1.2
OUTPUT RETURN LOSS |S22| (dB)
20.0
-10
1.6 1.8 2.0
-50
-5.0
-60
-5.5
-70
-6.0
-40
-6.5
-80
-45
500 750 1000 1250 1500 1750 2000 2250 2500
500 750 1000 1250 1500 1750 2000 2250 2500
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
-40
-15
10
35
60
85
TEMPERATURE (°C)
_______________________________________________________________________________________
3
MAX2659
Typical Operating Characteristics
(MAX2659 EV kit; Typical values are at VCC = 2.85V, TA = +25°C, and fRFIN = 1575.42MHz, unless otherwise noted.)
Typical Operating Characteristics (continued)
(MAX2659 EV kit; Typical values are at VCC = 2.85V, TA = +25°C, and fRFIN = 1575.42MHz, unless otherwise noted.)
INPUT P1dB COMPRESSION
vs. TEMPERATURE
-5
-6
-10
-7
-12
-13
-14
-15
-8
1.6 1.8 2.0 2.2 2.4 2.6 2.8
-40
3.0 3.2 3.4
10
35
60
TEMPERATURE (°C)
INPUT P1dB COMPRESSION
vs. SUPPLY VOLTAGE
INPUT P1dB COMPRESSION
vs. JAMMER FREQUENCY
-14
-16
MAX2659 toc13
-5
P1dB COMPRESSION (dBm)
-12
85
0
MAX2659 toc12
-10
-18
-10
-15
-20
-25
-20
-30
1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4
500 750 1000 1250 1500 1750 2000 2250 2500
SUPPLY VOLTAGE (V)
JAMMER FREQUENCY (MHz)
NF vs. JAMMER POWER AT 850MHz
NF vs. JAMMER POWER AT 1850MHz
3.5
MAX2659 toc14
3.5
3.0
3.0
2.5
NF (dB)
2.5
2.0
1.5
2.0
1.5
1.0
1.0
0.5
0.5
0
0
-30
-25
-20
-15
JAMMER POWER (dBm)
4
-15
SUPPLY VOLTAGE (V)
-8
P1dB COMPRESSION (dBm)
-11
MAX2659 toc15
IIP3 (dBm)
-4
-9
MAX2659 toc11
TWO TONES LOCATED AT 5MHz AND
10MHz OFFSET WITH -40dBm/TONE
P1dB COMPRESSION (dBm)
-3
MAX2659 toc10
IIP3 vs. SUPPLY VOLTAGE
NF (dB)
MAX2659
GPS/GNSS Low-Noise Amplifier
-10
-5
-30
-25
-20
-15
JAMMER POWER (dBm)
_______________________________________________________________________________________
-10
GPS/GNSS Low-Noise Amplifier
PIN
NAME
FUNCTION
1, 2
GND
Ground. Connect to the PCB ground plane.
3
RFIN
RF Input. Requires a DC-blocking capacitor and external matching components.
4
VCC
Supply Voltage. Bypass to ground with a 33nF capacitor as close as possible to the IC.
5
SHDN
Shutdown Input. A logic-low disables the device.
6
RFOUT
RF Output. RFOUT is internally matched to 50 and incorporates an internal DC-blocking capacitor.
Detailed Description
The MAX2659 is an LNA designed for GPS L1,
GALILEO, and GLONASS applications. The device features a power-shutdown control mode to eliminate the
need for an external supply switch. The device
achieves a 20.5dB gain and an ultra-low-noise figure of
0.8dB. The MAX2659 consumes approximately 4.1mA
while providing a IP1dB of -12dBm and an IIP3 of -5dBm.
Input and Output Matching
The MAX2659 requires an off-chip input matching. Only
a 6.8nH inductor in series with a DC-blocking capacitor
is needed to form the input matching circuit. The
Typical Application Circuit diagram shows the recommended input-matching network. These values are
optimized for the best simultaneous gain, noise figure,
and return loss performance. Table 1 lists typical
device S11 values. The MAX2659 integrates an on-chip
output matching to 50Ω at the output, eliminating the
need for external matching components.
Shutdown
The MAX2659 includes a shutdown feature to turn off
the entire chip. Apply a logic high to SHDN pin to place
the part in the active mode and a logic low to place the
part in the shutdown mode.
Applications Information
A properly designed PC board (PCB) is essential to any
RF microwave circuit. Use controlled-impedance lines
on all high-frequency inputs and outputs. Bypass VCC
with decoupling capacitors located close to the device.
For long VCC lines, it may be necessary to add decoupling capacitors. Locate these additional capacitors
further away from the device package. Proper grounding of the GND pins is essential. If the PCB uses a topside RF ground, connect it directly to the GND pins. For
a board where the ground is not on the component
layer, connect the GND pins to the board with multiple
vias close to the package.
Table 1. Typical S11 Values
FREQUENCY (MHz)
REAL S11
Chip Information
IMAGINARY S11
PROCESS: SiGe BiCMOS
1000
-0.58
-j0.52
1100
-0.68
-j0.356
1200
-0.74
-j0.16
1300
-0.74
j0.036
1400
-0.676
j0.22
Package Information
1500
-0.56
j0.36
1575
-0.47
j0.415
For the latest package outline information and land patterns, go
to www.maxim-ic.com/packages.
1600
-0.44
j0.43
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
1700
-0.36
j0.467
6 µDFN
L611-2
21-0147
1800
-0.3
j0.51
1900
-0.228
j0.567
2000
-0.14
j0.622
_______________________________________________________________________________________
5
MAX2659
Pin Description
MAX2659
GPS/GNSS Low-Noise Amplifier
Revision History
PAGES
CHANGED
REVISION
NUMBER
REVISION
DATE
0
4/07
Initial release
—
1
5/08
Updated Digital Input-Logic High specification and added RFIN DC
Voltage specification in DC Electrical Characteristics table
2
2
9/09
Added MAX2659ELT/V+ to Ordering Information
1
DESCRIPTION
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
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