GPS/GNSS LNAs with Antenna Switch and Bias
MAX2674/MAX2676
EVALUATION KIT AVAILABLE
19-5670; Rev 1; 7/15
Typical Operating Circuit
General Description
The MAX2674/MAX2676 are ultra-small, high-IP3, low-
noise amplifiers (LNAs) designed for GPS L1, Galileo,
and GLONASS applications. Designed in Maxim’s
advanced SiGe process, the devices are also equipped
with an autosensing feature for applications that enable
the use of external antennas. These high-performance
LNAs provide high gain and an ultra-low noise figure
while optimizing the input-referred 2dB compression
point and 3rd-order intercept point.
The ultra-small size is ideal for front-end modules and
receiver applications in cellular phones, smartphones,
PDAs, PNDs, or other custom GNSS applications. The
MAX2674/MAX2676 operate from a 1.6V to 3.6V single
supply. The MAX2674 is optimized for high gain, while
the MAX2676 is optimized for high linearity. A shutdown
feature is present in both devices reducing the supply
current to less than 10FA. The antenna port automati-
cally senses when an external antenna is connected,
eliminating the need for additional control circuitry
while also providing improved short-circuit protection.
The MAX2674/MAX2676 are available in an ultra-small,
RoHS-compliant 0.86mm x 1.26mm x 0.64mm wafer-
level package (WLP).
Features
S Eliminate Discrete Antenna Sensing, Switching,
and Bias Networks
Autodetect Antenna Connection
Provide Antenna Bias
Short-Circuit Protection
S Wide 1.6V to 3.6V Supply Voltage Range
S Ultra-Small Footprint (0.86mm x 1.26mm) WLP
Package
S For Applications Without Antenna Port, Use Pin-
Compatible 4-Bump MAX2686/MAX2687/MAX2688
LNA
Applications
Front-End SAW Modules
Receiver Modules
Cellular and Smartphones
Telematics (Asset Tracking and Management)
Personal Navigation Devices (PNDs)
Recreational, Marine Navigation
Ordering Information
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
PART TEMP RANGE PIN-PACKAGE
MAX2674EWT+T -40NC to +85NC6 WLP
MAX2676EWT+T -40NC to +85NC6 WLP
MAX2674
MAX2676
VCC
1.6V TO 3.6V
RFIN
ANT
BIAS
ACTIVE
ANTENNA
RFOUT/SHDN
RFOUT
39pF
25kI
100pF
SHDN
OPTIONAL
GNDAC
GNDDC ANT
A1 A2
B1 B2
10pF
100pF
OPTIONAL
88nH
C1 C2
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
GPS/GNSS LNAs with Antenna Switch and Bias
MAX2674/MAX2676
2 Maxim Integrated
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.
VCC to GND_ ........................................................ -0.3V to +3.9V
Other Pins to GND_ .................................. -0.3V to (VCC + 0.3V)
Maximum Input Power ..................................................... +5dBm
Continuous Power Dissipation (TA = +70NC)
WLP (derate 10.5mW/NC above +70NC)......................840mW
Operating Temperature Range .......................... -40NC to +85NC
Junction Temperature .....................................................+150NC
Storage Temperature Range ............................ -65NC to +160NC
Soldering Temperature (reflow, Note 1) ..........................+260NC
DC ELECTRICAL CHARACTERISTICS
(VCC = 1.6V to 3.6V, no RF signal applied, TA = -40NC to +85NC. Typical values are at VCC = 3.3V, TA = +25NC, unless otherwise
noted.) (Note 2)
ABSOLUTE MAXIMUM RATINGS
CAUTION! ESD SENSITIVE DEVICE
Note 1: Refer to Application Note 1891: Wafer-Level Packaging (WLP) and its Applications.
AC ELECTRICAL CHARACTERISTICS
(VCC = 1.6V to 3.6V, fRFIN = 1575.42MHz, TA = -40NC to +85NC. Typical values are at VCC = 3.3V, TA = +25NC, unless otherwise
noted.) (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Voltage 1.6 3.3 3.6 V
Supply Current 4.5 7 mA
Shutdown Current VSHDN = 0V 10 FA
Shutdown Logic-Low 0.45 V
Shutdown Logic-High 1.2 V
ANT Sense Threshold Causes autosense to switch to ANT 75 200 850 FA
ANT Current Limit ANT connected to GND_ 20 30 45 mA
ANT Port Supply Drop Voltage drop from VCC with 10mA load on ANT 75 mV
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum RF Input
Frequency 1575.42 MHz
Maximum RF Input
Frequency 1610 MHz
Power Gain MAX2674 13 18 dB
MAX2676 11 15
Noise Figure 0.75 dB
In-Band Input IP3 MAX2674, RF input = fO Q2.5MHz at -40dBm each -2 dBm
MAX2676, RF input = fO Q2.5MHz at -40dBm each +5
ANT In-Band Input IP3 RF input = fO Q2.5MHz at -25dBm each +30 dBm
GPS/GNSS LNAs with Antenna Switch and Bias
MAX2674/MAX2676
3Maxim Integrated
AC ELECTRICAL CHARACTERISTICS (continued)
(VCC = 1.6V to 3.6V, fRFIN = 1575.42MHz, TA = -40NC to +85NC. Typical values are at VCC = 3.3V, TA = +25NC, unless otherwise
noted.) (Note 2)
Note 2: Guaranteed by test at TA = +25NC, guaranteed by design and characterization at TA = -40NC and TA = +85NC.
Typical Operating Characteristics
(MAX2674/MAX2676 EV Kit. Typical values are at VCC = 3.3V, TA = +25NC, unless otherwise specified.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Out-of-Band Input IP3
MAX2674, RF input = 1713.42MHz, -17dBm and
1851.42MHz, -59dBm 3
dBm
MAX2676, RF input = 1713.42MHz, -17dBm and
1851.42MHz, -59dBm 5
Input P2dB MAX2674, fRFIN = 1580.42MHz -7 dBm
MAX2676, fRFIN = 1580.42MHz -4
Input Return Loss 15 dB
Output Return Loss 15 dB
Reverse Isolation 45 dB
ANT Insertion Loss 1.5 dB
RFIN to ANT Isolation 45 dB
MAX2674 INPUT RETURN LOSS
vs. FREQUENCY
MAX2674 toc01
FREQUENCY (MHz)
|S11| (dB)
225020001500 17501000 1250750
-40
-35
-30
-25
-20
-15
-10
-5
0
-45
500 2500
LNA
ANTENNA
MAX2674 GAIN vs. FREQUENCY
MAX2674 toc02
FREQUENCY (MHz)
GAIN (dB)
22502000750 1000 1250 1500 1750
-10
-5
0
5
10
15
20
25
-15
500 2500
LNA
ANTENNA
MAX2674 REVERSE ISOLATION
vs. FREQUENCY
MAX2674 toc03
FREQUENCY (MHz)
|S12| (dB)
-60
-50
-40
-30
-20
-10
0
-70
22502000750 1000 1250 1500 1750500 2500
LNA
ANTENNA
GPS/GNSS LNAs with Antenna Switch and Bias
MAX2674/MAX2676
4 Maxim Integrated
Typical Operating Characteristics (continued)
(MAX2674/MAX2676 EV Kit. Typical values are at VCC = 3.3V, TA = +25NC, unless otherwise specified.)
MAX2674 OUTPUT RETURN LOSS
vs. FREQUENCY
MAX2674 toc04
|S22| (dB)
-25
-20
-15
-10
-5
0
-30
FREQUENCY (MHz)
22502000750 1000 1250 1500 1750500 2500
LNA
ANTENNA
MAX2674 ACTIVE PATH IN-BAND IIP3
vs. SUPPLY VOLTAGE AND TEMPERATURE
(TWO TONES LOCATED AT 1MHz AND
2MHz OFFSET WITH -30dBm/TONE)
MAX2674 toc05
SUPPLY VOLTAGE (V)
IIP3 (dBm)
3.02.82.62.42.22.01.8
-3
-2
-1
0
-4
1.6 3.2
-40°C
+25°C
+85°C
MAX2674 ANTENNA PATH IN-BAND IIP3
vs. SUPPLY VOLTAGE AND TEMPERATURE
(TWO TONES LOCATED AT 1MHz
AND 2MHz OFFSET WITH -10dBm/TONE)
MAX2674 toc06
SUPPLY VOLTAGE (V)
IIP3 (dBm)
3.02.82.62.42.22.01.8
29.5
30.0
30.5
31.0
31.5
32.0
29.0
1.6 3.2
+85°C
+25°C
-40°C
MAX2674 ACTIVE PATH OUT-OF-BAND IIP3
vs. SUPPLY VOLTAGE AND TEMPERATURE
(TONE1 AT -27dBm/1713MHz, TONE2 AT -39dBm/1851MHz)
MAX2674 toc07
SUPPLY VOLTAGE (V)
IIP3 (dBm)
3.02.81.8 2.0 2.2 2.4 2.6
-2
-1
0
1
2
3
4
5
-3
1.6 3.2
-40°C +25°C
+85°C
MAX2674 ACTIVE PATH INPUT P2dB
vs. SUPPLY VOLTAGE AND TEMPERATURE
(TONE1 AT -27dBm/1713MHz, TONE2 AT -39dBm/1851MHz)
MAX2674 toc08
SUPPLY VOLTAGE (V)
INPUT P2dB (dBm)
3.23.02.6 2.82.0 2.2 2.41.8
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-14
1.6
+85°C
+25°C
-40°C
MAX2674 ACTIVE PATH 2dB GAIN
DESENSE vs. BLOCKER FREQUENCY
MAX2674 toc09
FREQUENCY (MHz)
BLOCKER POWER (dBm)
22502000750 1000 1250 1500 1750
-7
-6
-5
-4
-3
-2
-1
0
-8
500 2500
MAX2676 INPUT RETURN LOSS
vs. FREQUENCY
MAX2674 toc10
FREQUENCY (MHz)
|S11| (dB)
-40
-35
-30
-25
-20
-15
-10
-5
0
-45
22502000750 1000 1250 1500 1750500 2500
LNA
ANTENNA
GPS/GNSS LNAs with Antenna Switch and Bias
MAX2674/MAX2676
5Maxim Integrated
Typical Operating Characteristics (continued)
(MAX2674/MAX2676 EV Kit. Typical values are at VCC = 3.3V, TA = +25NC, unless otherwise specified.)
MAX2676 GAIN vs. FREQUENCY
MAX2674 toc11
GAIN (dB)
-10
-5
0
5
10
15
20
25
-15
FREQUENCY (MHz)
22502000750 1000 1250 1500 1750500 2500
LNA
ANTENNA
MAX2676 REVERSE ISOLATION
vs. FREQUENCY
MAX2674 toc12
FREQUENCY (MHz)
|S12| (dB)
-60
-50
-40
-30
-20
-10
0
-70
22502000750 1000 1250 1500 1750500 2500
LNA
ANTENNA
MAX2676 OUTPUT RETURN LOSS
vs. FREQUENCY
MAX2674 toc13
|S22| (dB)
-35
-30
-25
-20
-15
-10
-5
0
-40
FREQUENCY (MHz)
22502000750 1000 1250 1500 1750500 2500
LNA
ANTENNA
MAX2676 ACTIVE PATH IN-BAND IIP3
vs. SUPPLY VOLTAGE AND TEMPERATURE
(TWO TONES LOCATED AT 1MHz
AND 2MHz OFFSET WITH -30dBm/TONE)
MAX2674 toc14
SUPPLY VOLTAGE (V)
IIP3 (dBm)
3.02.81.8 2.0 2.2 2.4 2.6
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
2.0
1.6 3.2
-40°C
+25°C
+85°C
MAX2676 ANTENNA PATH IN-BAND IIP3
vs. SUPPLY VOLTAGE AND TEMPERATURE
(TWO TONES LOCATED AT 1MHz
AND 2MHz OFFSET WITH -10dBm/TONE)
MAX2674 toc15
SUPPLY VOLTAGE (V)
IIP3 (dBm)
3.02.82.62.42.22.01.8
29.5
30.0
30.5
31.0
31.5
32.0
29.0
1.6 3.2
+85°C
+25°C
-40°C
MAX2676 ACTIVE PATH OUT-OF-BAND IIP3
vs. SUPPLY VOLTAGE AND TEMPERATURE
(TONE1 AT -27dBm/1713MHz,
TONE2 AT -39dBm/1851MHz)
MAX2674 toc16
SUPPLY VOLTAGE (V)
IIP3 (dBm)
3.02.81.8 2.0 2.2 2.4 2.6
2
3
4
5
6
7
8
1
1.6 3.2
+25°C
-40°C
+85°C
MAX2676 ACTIVE PATH INPUT P2dB
vs. SUPPLY VOLTAGE AND TEMPERATURE
(TONE1 AT -27dBm/1713MHz, TONE2 AT -39dBm/1851MHz)
MAX2674 toc17
SUPPLY VOLTAGE (V)
INPUT P2dB (dBm)
3.23.02.6 2.82.0 2.2 2.41.8
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-12
1.6
+85°C
+25°C
-40°C
MAX2676 ACTIVE PATH 2dB GAIN
DESENSE vs. BLOCKER FREQUENCY
MAX2674 toc18
FREQUENCY (MHz)
BLOCKER POWER (dBm)
22502000750 1000 1250 1500 1750
-4
-3
-1
-2
0
1
2
3
4
-6
-5
500 2500
GPS/GNSS LNAs with Antenna Switch and Bias
MAX2674/MAX2676
6 Maxim Integrated
Bump Configuration
Bump Description
PIN NAME FUNCTION
A1 VCC VCC. Place bypass capacitor as close as possible to the pin.
A2 RFOUT/
SHDN
RF Output and Shutdown Logic Input. Output match is included on-chip. Couple SHDN logic control
through a 25kI resistor. DC logic-low shuts down the part.
B1 RFIN RF Input. Requires a DC-blocking capacitor and an external inductor matching component.
B2 GNDAC Ground for RF Circuits. Connect to the 2nd layer PCB ground plane with a via next to the pad.
C1 GNDDC Ground for DC and Bias Circuits. Connect to the 2nd layer PCB ground plane with a via next to the
pad.
C2 ANT Antenna Input
TOP VIEW
VCC
RFIN
GNDDC
RFOUT/SHDN
GNDAC
ANT
A1 A2
B1 B2
C1 C2
MAX2674
MAX2676
GPS/GNSS LNAs with Antenna Switch and Bias
MAX2674/MAX2676
7Maxim Integrated
Detailed Description
The MAX2674/MAX2676 are low-power LNAs designed
for GPS/GNSS receiver applications. The devices feature
low noise and high linearity in an ultra-small package.
They also include an antenna switch and circuitry sup-
porting bias to accommodate external LNA applications.
Input and Output Matching
To achieve optimal performance in noise figure, gain,
and IIP3, the devices require one matching inductor at
RFIN in series with a DC-blocking capacitor. RFOUT/
SHDN is internally matched to 50I, eliminating the need
for external matching components. At RFOUT/SHDN, an
external DC-blocking capacitor should be used to isolate
the shutdown control function.
Shutdown Mode
To place the device in shutdown mode, apply logic-low
to RFOUT/SHDN through a 25kΩ resistor. An additional
DC-blocking capacitor or component is required at
RFOUT/SHDN in this case. Apply a logic-high state or no
DC bias to turn the part permanently on.
DC Supply Decoupling and Layout
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 a decoupling capacitor located close to the device.
For long VCC lines, it may be necessary to add additional
decoupling capacitors. Locate these additional capaci-
tors further away from the device package.
Proper grounding of GND_ pins is essential. If the PCB
uses a top-side 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.
Antenna Switch Control
The MAX2674/MAX2676 ANT input includes an autode-
tection feature. When no current is drawn from ANT, the
switch defaults to normal LNA operation. The pin can be
directly connected to an external active antenna. The
device automatically switches to the ANT input when an
external active antenna is connected.
Refer to www.maximintegrated.com for the MAX2674/
MAX2676 EV Kit schematic, layout files, BOM information,
and S-parameters.
Table 1. MAX2674 Typical Noise Parameters (VCC = 2.85V, TA = +25°C)
Table 2. MAX2676 Typical Noise Parameters (VCC = 2.85V, TA = +25°C)
FREQUENCY (MHz) NFMIN (dB) GAMMA_OPT MAG (°)GAMMA_OPT PHASE (°)Rn (I)
1550 0.651 0.446 44.1 8.33
1560 0.652 0.445 44.3 8.33
1570 0.654 0.445 44.6 8.32
1580 0.655 0.444 44.8 8.31
1590 0.656 0.444 45.1 8.3
1600 0.657 0.443 45.4 8.3
FREQUENCY (MHz) NFMIN (dB) GAMMA_OPT MAG (°)GAMMA_OPT PHASE (°)Rn (I)
1550 0.744 0.441 53.1 8.7
1560 0.746 0.44 53.4 8.68
1570 0.748 0.439 53.7 8.66
1580 0.75 0.438 54 8.65
1590 0.751 0.437 54.3 8.63
1600 0.753 0.436 54.7 8.62
GPS/GNSS LNAs with Antenna Switch and Bias
MAX2674/MAX2676
8 Maxim Integrated
Package Information
For the latest package outline information and land patterns, go
to www.maximintegrated.com/packages. Note that a “+”, “#”,
or “-” in the package code indicates RoHS status only. Package
drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Chip Information
PROCESS: SiGe BiCMOS
PACKAGE
TYPE
PACKAGE
CODE OUTLINE NO. LAND
PATTERN NO.
6 WLP W61B1+1 21-0217
Refer to
Application Note
1891
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and
max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 9
© 2015 Maxim Integrated Products, Inc. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
GPS/GNSS LNAs with Antenna Switch and Bias
MAX2674/MAX2676
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 12/10 Initial release —
1 7/15 Removed Avionics and Military from Applications 1
