EVALUATION KIT AVAILABLE
MAX2686L/MAX2693L
GPS/GNSS Low-Noise Amplifiers
with Integrated LDO
General Description
Benefits and Features
The MAX2686L/MAX2693L low-noise amplifiers (LNAs)
are designed for GPS L1, Galileo, and GLONASS applications. Designed in Maxim’s advanced SiGe process, the
devices achieve high gain and low noise figure while maximizing the input-referred 1dB compression point and the
3rd-order intercept point. Both devices include an internal
LDO ideal for battery-powered applications. For currentsensitive applications, the MAX2693L achieves excellent
performance while consuming only 1.8mA current.
●● High Power Gain: 19dB (MAX2686L)
●● Low Noise Figure: 0.88dB (MAX2686L)
●● Integrated 50Ω Output Matching Circuit
●● Low Supply Current: 1.8mA (MAX2693L)
●● Wide Supply Voltage Range: 1.6V to 4.2V
●● Low Bill of Materials: One Inductor, Two Capacitors
●● Small Footprint: 0.86mm x 0.86mm
●● 0.4mm Pitch WLP
The devices operate from a +1.6V to +4.2V single supply. The shutdown feature reduces the supply current to
less than 20µA. The devices are available in a very small,
lead-free, RoHS-compliant, 0.86mm x 0.86mm x 0.65mm
wafer-level package (WLP).
Applications
●●
●●
●●
●●
●●
●●
Ordering Information appears at end of data sheet.
Telematics (Asset Tracking and Management)
Cellular Phones with GPS
Notebook PCs/Ultra-Mobile PCs
Recreational, Marine Navigation
Watches
Digital Cameras
Typical Operating Circuit
+
VCC
VCC
MAX2686L
MAX2693L
A1
LDO
A2
RFOUT
C2
RF
INPUT
C1
L1
R1
25kΩ
RFIN
ENABLE = VCC
SHDN = GND
B1
MAX2686L
L1 = 7.3nH
C1 = 100nF
C2 = 10pF
19-6258; Rev 1; 2/15
RF
OUTPUT
B2
MAX2693L
L1 = 12nH
C1 = 100nF
C2 = 10pF
GND
MAX2686L/MAX2693L
GPS/GNSS Low-Noise Amplifiers
with Integrated LDO
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................................................+5dBm
Continuous Power Dissipation (TA = +70°C)
WLP (derates 9.7mW/°C above +70°C).......................776mW
Maximum Current into RF Input...........................................10mA
Operating Temperature Range.............................-40°C to +85°C
Junction Temperature.......................................................+150°C
Storage Temperature Range..............................-65°C to +160°C
Soldering Temperature (reflow) (Note 1)...........................+260°C
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: Refer to Application Note 1891: Wafer-Level Packaging (WLP) and Its Applications.
CAUTION! ESD SENSITIVE DEVICE
DC Electrical Characteristics
(MAX2686L /MAX2693L EV kit, VCC = 1.6V to 4.2V, TA = -40°C to +85°C, no RF signals are applied. Typical values are at VCC = 3.3V
and TA = +25°C, unless otherwise noted.) (Note 2)
PARAMETER
CONDITIONS
Supply Voltage
Supply Current
SHDN = high
MIN
TYP
MAX
UNITS
1.6
3.3
4.2
V
MAX2686L
5
MAX2693L
1.8
mA
Shutdown mode, VSHDN = 0V
Digital Input Logic-High
(Note 3)
Digital Input Logic-Low
(Note 3)
20
1.2
µA
V
0.45
V
AC Electrical Characteristics
(MAX2686L/MAX2693L EV kit, VCC = 1.6V to 4.2V, TA = -40°C to +85°C, fRFIN = 1575.42MHz. Typical values are at VCC = 3.3V and
TA = +25°C, unless otherwise noted.) (Note 2)
PARAMETER
RF Frequency
Power Gain
CONDITIONS
VCC = 4.2V (Note 4)
VCC = 1.6V
Noise Figure
MIN
L1 band
VCC = 1.6V to 4.2V
TYP
MAX2686L
14.65
19.0
MAX2693L
11.6
18.4
MAX2686L
14.85
19.1
MAX2693L
11.6
18.7
MAX2686L
0.88
MAX2693L
1.05
In-Band 3rd-Order Input Intercept
(Note 5)
Point
MAX2686L
-4.1
MAX2693L
-14.3
Out-of-Band 3rd-Order Input
Intercept Point
(Note 6)
MAX2686L
-0.1
MAX2693L
-13.9
Input 1dB Compression Point
(Note 7)
MAX2686L
-12.1
MAX2693L
-11.0
Input Return Loss
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MAX
1575.42
MAX2686L
11.2
MAX2693L
10.7
UNITS
MHz
dB
dB
dBm
dBm
dBm
dB
Maxim Integrated │ 2
MAX2686L/MAX2693L
GPS/GNSS Low-Noise Amplifiers
with Integrated LDO
AC Electrical Characteristics (continued)
(MAX2686L/MAX2693L EV kit, VCC = 1.6V to 4.2V, TA = -40°C to +85°C, fRFIN = 1575.42MHz. Typical values are at VCC = 3.3V and
TA = +25°C, unless otherwise noted.) (Note 2)
PARAMETER
CONDITIONS
Output Return Loss
Reverse Isolation
MIN
TYP
MAX2686L
22.0
MAX2693L
14.3
MAX2686L
41.0
MAX2693L
40.0
MAX
UNITS
dB
dB
Note 2: 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, unless otherwise noted.
Note 3: Min and max limits guaranteed by test at TA = +25°C.
Note 4: Min limit guaranteed by design and characterization.
Note 5: Measured with the two tones located at 1MHz and 2MHz offset from the center of the GPS band with -30dBm/tone.
Note 6: Measured with input tones at 1713MHz (-27dBm) and 1851MHz (-39dBm).
Note 7: Measured with a tone located at the center of the GPS band.
Typical Operating Characteristics
(MAX2686L/MAX2693L EV kit. Typical values are at VCC = 3.3V, TA = +25°C, and fRFIN = 1575.42MHz, unless otherwise noted.)
MAX2686L
-10
VCC = 1.6V
15
GAIN (dB)
S11 (dB)
VCC = 4.2V
+25°C
VCC = 3.2V
VCC = 4.2V
10
1.6V
3.2V
4.2V
-40
-50
VCC = 1.6V
-20
5
-30
-30
MAX2686L toc03
VCC = 3.2V
20
MAX2686L REVERSE ISOLATION
vs. FREQUENCY
|S12| (dB)
+25°C
MAX2686L toc01
0
MAX2686L
GAIN vs. FREQUENCY
MAX2686L toc02
MAX2686L INPUT RETURN LOSS
vs. FREQUENCY
500
1000
1500
2000
FREQUENCY (MHz)
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2500
0
-60
500
1000
1500
2000
FREQUENCY (MHz)
2500
-70
500
1000
1500
2000
2500
FREQUENCY (MHz)
Maxim Integrated │ 3
MAX2686L/MAX2693L
GPS/GNSS Low-Noise Amplifiers
with Integrated LDO
Typical Operating Characteristics (continued)
(MAX2686L/MAX2693L EV kit. Typical values are at VCC = 2.85V, TA = +25°C, and fRFIN = 1575.42MHz, unless otherwise noted.)
MAX2686L
MAX2686L OUTPUT RETURN LOSS
vs. FREQUENCY
-40°C
+25°C
-40°C
1
IIP3 (dBm)
VCC = 3.2V
VCC = 1.6V
-15
VCC = 4.2V
+25°C
IIP3 (dBm)
-4
-10
3
MAX2686L toc05
+25°C
-5
|S22| (dB)
-3
MAX2686L toc04
0
MAX2686L OUT-OF-BAND IIP3
vs. SUPPLY VOLTAGE AND TEMPERATURE
(TONE 1 AT 1713MHz, -27dBm;
TONE 2 AT 1851MHz, -39dBm)
+85°C
-1
-5
+85°C
-20
500
1000
1500
2000
-6
2500
1.6
2.1
2.6
3.1
3.6
2.0
1.6
MAX2686L toc07
-9
-13
2.2
2.6
3.0
3.6
4.0
1.2
+25°C
0.8
-40°C
3.4
SUPPLY VOLTAGE (V)
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3.2
MAX2686L NOISE FIGURE vs. SUPPLY
VOLTAGE AND TEMPERATURE
+85°C
-15
2.8
+85°C
NOISE FIGURE (dB)
-40°C
+25°C
2.4
SUPPLY VOLTAGE (V)
MAX2686L INPUT P1dB COMPRESSION
vs. SUPPLY VOLTAGE AND TEMPERATURE
INPUT P1dB (dBm)
1.6
SUPPLY VOLTAGE (V)
FREQUENCY (MHz)
-11
-3
4.1
MAX2686L toc08
-25
MAX2686L toc06
MAX2686L IN-BAND IIP3 vs. SUPPLY VOLTAGE
AND TEMPERATURE (TWO TONES LOCATED AT
1MHz AND 2MHz OFFSET WITH -30dBm/ TONE)
3.8
4.2
0.4
1.6
2.0
2.4
2.8
3.2
3.6
4.0
SUPPLY VOLTAGE (V)
Maxim Integrated │ 4
MAX2686L/MAX2693L
GPS/GNSS Low-Noise Amplifiers
with Integrated LDO
Typical Operating Characteristics (continued)
(MAX2686L/MAX2693L EV kit. Typical values are at VCC = 2.85V, TA = +25°C, and fRFIN = 1575.42MHz, unless otherwise noted.)
MAX2693L
+25°C
+25°C
VCC = 1.6V
10
VCC = 1.6V
GAIN (dB)
S11 (dB)
-4
MAX2693L GAIN vs. FRQUENCY
20
MAX2686L toc09
0
MAX2686L toc10
MAX2693L INPUT RETURN LOSS
vs. FREQUENCY
-8
VCC = 3.2V
VCC = 4.2V
0
-12
VCC = 3.2V
VCC = 4.2V
500
500
1000
1500
2000
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX2693L REVERSE ISOLATION
vs. FREQUENCY
MAX2693L OUTPUT RETURN LOSS
vs. FREQUENCY
0
-60
-8
VCC = 3.2V
1000
1500
2000
FREQUENCY (MHz)
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2500
-16
VCC = 4.2V
VCC = 1.6V
-12
500
2500
-4
|S22| (dB)
+25°C
-50
-70
-10
2500
2000
1.6V
3.2V
4.2V
-40
|S12| (dB)
1500
MAX2686L toc12
-30
1000
MAX2686L toc11
-16
500
1000
1500
2000
2500
FREQUENCY (MHz)
Maxim Integrated │ 5
MAX2686L/MAX2693L
GPS/GNSS Low-Noise Amplifiers
with Integrated LDO
Typical Operating Characteristics (continued)
(MAX2686L/MAX2693L EV kit. Typical values are at VCC = 2.85V, TA = +25°C, and fRFIN = 1575.42MHz, unless otherwise noted.)
MAX2693L
-16
+25°C
-40°C
MAX2686L toc14
+85°C
IIP3 (dBm)
+85°C
IIP3 (dBm)
-13
MAX2686L toc13
-15
MAX2693L OUT-OF-BAND IIP3
vs. SUPPLY VOLTAGE AND TEMPERATURE
(TONE 1 AT 1713MHz, -27dBm;
TONE 2 AT 1851MHz, -39dBm)
MAX2693L IN-BAND IIP3 vs. SUPPLY
VOLTAGE AND TEMPERATURE
(TWO TONES LOCATED AT 1MHz AND
2MHz OFFSET WITH -30dBm/TONE)
-14
+25°C
-40°C
-17
1.6
2.1
2.6
3.1
3.6
1.6
2.0
2.4
2.8
3.2
3.6
4.0
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
MAX2693L INPUT P1dB COMPRESSION
vs. SUPPLY VOLTAGE AND TEMPERATURE
MAX2693L NOISE FIGURE
vs. SUPPLY VOLTAGE AND TEMPERATURE
NOISE FIGURE (dB)
-12
-40°C
+25°C
MAX2686L toc16
+85°C
-14
1.6
MAX2686L toc15
-10
INPUT P1dB (dBm)
-15
4.1
+85°C
1.2
+25°C
0.8
-16
-18
1.6
2.0
2.4
2.8
3.2
SUPPLY VOLTAGE (V)
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3.6
4.0
0.4
-40°C
1.6
2.0
2.4
2.8
3.2
3.6
4.0
SUPPLY VOLTAGE (V)
Maxim Integrated │ 6
MAX2686L/MAX2693L
GPS/GNSS Low-Noise Amplifiers
with Integrated LDO
Bump Configuration
TOP VIEW
VCC
+
A1
A2
MAX2686L
MAX2693L
RFIN
B1
B2
RFOUT
ENABLE/(SHDN)
GND
WLP
Bump Description
BUMP
NAME
A1
VCC
FUNCTION
A2
RFOUT
ENABLE/(SHDN)
B1
RFIN
RF Input. Requires a DC-blocking capacitor and external matching components.
B2
GND
Ground. Connect to the PCB ground plane.
Supply Voltage. Bypass to ground with a 10pF capacitor as close as possible to the IC.
RF Output. RFOUT is internally matched to 50Ω. Pulling the DC high through the 25kΩ resistor
enables the IC. RFOUT(SHDN) can be pulled to a DC low through a 25kΩ resistor to shut down
the IC.
Detailed Description
The MAX2686L/MAX2693L are LNAs designed for GPS
L1, Galileo, and GLONASS applications. The devices feature an optional power-shutdown control mode to eliminate the need for an external supply switch. The devices
achieve high gain and low noise figure in an ultra-small
package ideal for space-sensitive applications. These
integrated ICs eliminate the need for an external LDO.
Input and Output Matching
The devices require an off-chip input matching. Only an
inductor in series with a DC-blocking capacitor is needed
to form the input matching circuit. The Typical Operating
Circuit shows the recommended input-matching network.
These values are optimized for the best simultaneous
gain, noise figure, and return loss performance. The value
of the input coupling capacitor affects IIP3. A smaller
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coupling capacitor results in lower IIP3. The devices integrate an on-chip output matching to 50Ω at the output,
eliminating the need for external matching components.
Table 1 and Table 2 list typical device S parameters and
Kf values. Typical noise parameters are shown in Table 3
and Table 4.
ENABLE/(SHDN)
The devices include a shutdown feature to turn off the
entire chip. The devices are placed in active mode by
default once VCC is applied, due to the off-chip pullup
resistor to VCC at the RFOUT bump. To shut down the part,
apply a logic-low to the RFOUT bump through an external
resistor with an adequate value, e.g., 25kΩ, in order not to
load the RF output signal during active operation.
To enable the part, apply a logic-high to the RFOUT bump
through the external 25kΩ resistor.
Maxim Integrated │ 7
MAX2686L/MAX2693L
GPS/GNSS Low-Noise Amplifiers
with Integrated LDO
Table 1. MAX2686L Typical S Parameter Values and K-Factor
S11
S21
S21 MAG
PHASE
PHASE
(dB)
(DEGREES)
(DEGREES)
S22
PHASE
(DEGREES)
Kf
-1.9
-153.8
16.1
-2.4
-169.9
9.8
64.8
-3.1
172.8
7.4
-49.2
51.0
-4.4
153.8
6.6
-47.4
1.8
-6.8
132.5
6.9
85.4
-50.7
19.3
-11.9
102.3
7.8
16.8
66.9
-44.6
29.9
-26.0
46.7
5.9
-126.8
16.8
58.4
-43.4
15.5
-24.3
-79.5
5.1
-131.1
16.5
34.7
-49.8
-7.5
-10.1
-125.4
6.5
-3.5
-139.0
16.1
12.9
-51.0
39.5
-5.4
-148.1
4.0
1900
-3.7
-146.3
15.2
-7.7
-41.9
7.5
-3.0
-169.7
2.2
2000
-4.0
-152.0
13.8
-24.4
-41.8
-10.7
-1.9
170.5
2.0
S12 MAG
(dB)
S12
S22 MAG
PHASE
(dB)
(DEGREES)
FREQ
(MHz)
S11 MAG
(dB)
1000
-2.7
-88.3
7.9
162.0
-56.7
101.9
1100
-2.9
-95.0
9.6
150.5
-48.5
57.5
1200
-3.2
-101.7
11.2
136.9
-45.5
1300
-3.4
-107.4
12.8
122.2
1400
-3.5
-113.3
14.4
104.8
1500
-3.3
-120.2
16.0
1575
-3.5
-125.7
1600
-3.7
1700
-3.6
1800
Table 2. MAX2693L Typical S Parameter Values and K-Factor
S11
S21
S12
S22
S21 MAG
S12 MAG
S22 MAG
PHASE
PHASE
PHASE
PHASE
(dB)
(dB)
(dB)
(DEGREES)
(DEGREES)
(DEGREES)
(DEGREES)
FREQ
(MHz)
S11 MAG
(dB)
1000
-1.0
-77.4
-2.5
-148.6
-55.5
78.6
-0.9
-138.2
16.1
Kf
1100
-1.1
-84.8
0.1
-159.7
-51.0
85.5
-1.2
-154.2
9.8
1200
-1.2
-92.5
2.7
-172.2
-48.0
70.0
-1.6
-172.0
7.4
1300
-1.3
-99.4
5.6
171.7
-46.4
56.0
-2.3
167.2
6.6
1400
-1.5
-106.5
8.4
152.1
-45.9
35.6
-3.8
140.1
6.9
1500
-1.6
-113.2
11.0
124.7
-46.3
22.2
-8.0
96.8
7.8
1575
-1.6
-118.5
12.2
99.5
-44.0
38.3
-14.8
23.5
5.9
1600
-1.7
-120.6
12.3
88.4
-42.4
22.2
-14.9
-33.4
5.1
1700
-1.9
-126.6
11.5
55.8
-45.3
-9.5
-6.5
-117.5
6.5
1800
-1.8
-133.6
10.0
30.2
-43.6
12.4
-3.3
-152.3
4.0
1900
-2.0
-140.7
8.4
10.0
-40.1
-8.1
-2.0
-176.5
2.2
2000
-2.1
-146.9
6.9
-4.9
-39.6
-29.9
-1.5
164.9
2.0
Table 3. MAX2686L Simulated Typical Noise Parameters (VCC = 3.3V, TA = +25°C)
FREQUENCY (MHz)
FMIN (dB)
|ΓOPT|
|ΓOPT| ANGLE
RN (Ω)
1550
0.70
0.43
45
8.45
1560
0.70
0.43
45
8.43
1570
0.70
0.42
45
8.42
1580
0.70
0.42
45
8.41
1590
0.70
0.42
46
8.39
1600
0.71
0.42
46
8.38
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Maxim Integrated │ 8
MAX2686L/MAX2693L
GPS/GNSS Low-Noise Amplifiers
with Integrated LDO
Table 4. MAX2693L Simulated Typical Noise Parameters (VCC = 3.3V, TA = +25°C)
FREQUENCY (MHz)
FMIN (dB)
|ΓOPT|
|ΓOPT| ANGLE
RN (Ω)
1550
0.88
0.69
32
24.27
1560
0.88
0.69
32
24.22
1570
0.88
0.68
32
24.17
1580
0.88
0.68
32
24.12
1590
0.88
0.68
32
24.07
1600
0.88
0.68
33
24.03
Applications Information
A properly designed PCB is essential to any RF microwave circuit. Use controlled-impedance lines on all highfrequency 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 bump is
essential. If the PCB uses a topside RF ground, connect
it directly to the GND bump. For a board where the ground
is not on the component layer, connect the GND bump
to the board with multiple vias close to the package. For
general layout guidelines, refer to www.maximintegrated.
com/app-notes/index.mvp/id/5100.
Refer to www.maximintegrated.com/datasheet /index. mvp/
id/6934/t/do for the MAX2686L/MAX2693L EV kit schematic, Gerber data, PADS layout file, and BOM information.
www.maximintegrated.com
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX2686LEWS+T
-40°C to +85°C
4 WLP
MAX2693LEWS+T
-40°C to +85°C
4 WLP
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel
Chip Information
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns
(footprints), 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.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
4 WLP
W40A0+1
21-0480
Refer to
Application
Note 1891
Maxim Integrated │ 9
MAX2686L/MAX2693L
GPS/GNSS Low-Noise Amplifiers
with Integrated LDO
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
0
3/12
Initial release
1
2/15
Updated Typical Operating Circuit, Bump Description, and Detailed Description to
show that the external resistor is now required and not optional
DESCRIPTION
—
1, 7
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
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 and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2015 Maxim Integrated Products, Inc. │ 10
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