Storage Temperature Range............................. -65°C to +160°C
Lead Temperature (soldering, 10s).........Reflow Profile (Note 1)
Soldering Temperature (reflow).......................................+260°C
Note 1:
Refer to Application Note 1891:
Wafer-Level Packaging (WLP)
and
Its Applications.
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
(MAX2686/MAX2688 EV kit, V
CC
= 1.6V to 3.3V, T
A
= -40°C to +85°C, no RF signals are applied. Typical values are at V
CC
= 2.85V
and T
A
= +25°C, unless otherwise noted.) (Note 2)
PARAMETER
Supply Voltage
Supply Current
Digital Input Logic-High
Digital Input Logic-Low
SHDN
= high
MAX2686
MAX2688
1.2
0.45
CONDITIONS
MIN
1.6
TYP
2.85
4.1
4.1
10
MAX
3.3
UNITS
V
mA
µA
V
V
Shutdown mode,
SHDN
= low
(Note 3)
(Note 3)
AC Electrical Characteristics
(MAX2686/MAX2688 EV kit, V
CC
= 1.6V to 3.3V, T
A
= -40°C to +85°C, f
RFIN
= 1575.42MHz. Typical values are at V
CC
= 2.85V and
T
A
= +25°C, unless otherwise noted.) (Note 2)
PARAMETER
RF Frequency
L1 band
V
CC
= 2.85V (Note 4)
Power Gain
V
CC
= 1.6V
Noise Figure
In-Band 3rd-Order Input
Intercept Point
Out-of-Band 3rd-Order Input
Intercept Point
Input 1dB Compression Point
Input Return Loss
V
CC
= 1.6V to 3.3V
(Note 5)
(Note 6)
(Note 7)
MAX2686
MAX2688
MAX2686
MAX2688
MAX2686
MAX2688
MAX2686
MAX2688
MAX2686
MAX2688
MAX2686
MAX2688
14.7
11.9
14.4
11.6
CONDITIONS
MIN
TYP
1575.42
19
15.4
18.9
15.3
0.75
0.8
-3
+4
0
+7
-10
-6
8.5
dB
dBm
dBm
dBm
dB
dB
MAX
UNITS
MHz
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Maxim Integrated
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MAX2686/MAX2688
GPS/GNSS Low-Noise Amplifiers
AC Electrical Characteristics (continued)
(MAX2686/MAX2688 EV kit, V
CC
= 1.6V to 3.3V, T
A
= -40°C to +85°C, f
RFIN
= 1575.42MHz. Typical values are at V
CC
= 2.85V and
T
A
= +25°C, unless otherwise noted.) (Note 2)
PARAMETER
Output Return Loss
Reverse Isolation
CONDITIONS
MIN
TYP
15
40
MAX
UNITS
dB
dB
Note 2:
Min and max limits guaranteed by test at T
A
= +25°C and guaranteed by design and characterization at T
A
= -40°C and
T
A
= +85°C, unless otherwise noted.
Note 3:
Min and max limits guaranteed by test at T
A
= +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 -27dBm/tone for the
MAX2686 and -24dBm/tone for the MAX2688.
Note 6:
Measured with input tones at 1713MHz (-27dBm) and 1851MHz (-39dBm).
Note 7:
Measured with a tone located at 5MHz offset from the center of the GPS band.
Typical Operating Characteristics
INPUT RETURN LOSS vs. FREQUENCY
MAX2686 toc01
(MAX2686/MAX2688 EV kit. Typical values are at V
CC
= 2.85V, T
A
= +25°C, and f
RFIN
= 1575.42MHz, unless otherwise noted.)
GAIN vs. FREQUENCY
MAX2686 toc02
-5
-10
MAX2686
MAX2688
20
15
GAIN (dB)
-25
-30
-35
|S12| (dB)
-40
-45
-50
-55
-60
-65
-70
MAX2688
MAX2686
|S11| (dB)
-15
-20
-25
-30
-35
-40
500
1000
MAX2686
10
MAX2688
5
0
-5
1500
2000
2500
500
1000
1500
2000
2500
500
1000
1500
2000
2500
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX2686 toc04
-5
-10
-15
-20
-25
-30
-35
500
MAX2686
-1
-2
IIP3 (dBm)
-3
-4
-5
T
A
= -40°C
T
A
= +25°C
|S22| (dB)
MAX2688
1000
1500
2000
2500
-6
T
A
= +85°C
1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2
SUPPLY VOLTAGE (V)
FREQUENCY (MHz)
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MAX2686 toc05
0
OUTPUT RETURN LOSS vs. FREQUENCY
(TWO TONES LOCATED AT 1MHz AND 2MHz OFFSET WITH -30dBm/TONE)
0
MAX2686 IN-BAND IIP3
vs. SUPPLY VOLTAGE AND TEMPERATURE
MAX2686 toc03
0
25
-20
REVERSE ISOLATION vs. FREQUENCY
MAX2686/MAX2688
GPS/GNSS Low-Noise Amplifiers
Typical Operating Characteristics (continued)
MAX2688 IN-BAND IIP3
vs. SUPPLY VOLTAGE AND TEMPERATURE
MAX2686 toc06
(MAX2686/MAX2688 EV kit. Typical values are at V
CC
= 2.85V, T
A
= +25°C, and f
RFIN
= 1575.42MHz, unless otherwise noted.)
MAX2686 OUT-OF-BAND IIP3
vs. SUPPLY VOLTAGE AND TEMPERATURE
MAX2686 toc07
(TWO TONES LOCATED AT 1MHz AND 2MHz OFFSET WITH -30dBm/TONE)
6
5
4
IIP3 (dBm)
3
2
1
0
T
A
= +85°C
IIP3 (dBm)
T
A
= -40°C
T
A
= +25°C
(TONE 1 AT 1713MHz, -27dBm; TONE 2 AT 1851MHz, -39dBm)
2.0
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
-2.5
T
A
= +85°C
1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2
SUPPLY VOLTAGE (V)
-3.0
T
A
= -40°C
T
A
= +25°C
1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2
SUPPLY VOLTAGE (V)
MAX2686 toc08
10
8
IIP3 (dBm)
6
4
2
0
T
A
= +25°C
T
A
= +85°C
-7
-8
INPUT P1dB (dBm)
-9
-10
-11
-12
-13
-14
-15
-16
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
T
A
= -40°C
1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2
SUPPLY VOLTAGE (V)
1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2
SUPPLY VOLTAGE (V)
MAX2686 toc10
-5
INPUT P1dB (dBm)
-6
-7
-8
-9
-10
-11
-12
1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2
SUPPLY VOLTAGE (V)
T
A
= -40°C
T
A
= +85°C
T
A
= +25°C
0
BLOCKER POWER (dBm)
-5
-10
-15
-20
-25
MAX2688
MAX2686
500
1000
1500
2000
2500
BLOCKER FREQUENCY (MHz)
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Maxim Integrated
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4
MAX2686 toc11
-4
MAX2688 INPUT P1dB COMPRESSION
vs. SUPPLY VOLTAGE AND TEMPERATURE
5
1dB GAIN DESENSE
vs. BLOCKER FREQUENCY
MAX2686 toc09
(TONE 1 AT 1713MHz, -27dBm; TONE 2 AT 1851MHz, -39dBm)
12
MAX2688 OUT-OF-BAND IIP3
vs. SUPPLY VOLTAGE AND TEMPERATURE
-6
MAX2686 INPUT P1dB COMPRESSION
vs. SUPPLY VOLTAGE AND TEMPERATURE
MAX2686/MAX2688
GPS/GNSS Low-Noise Amplifiers
Bump Configuration
TOP VIEW
+
A1
A2
V
CC
RFOUT (SHDN)
MAX2686
MAX2688
RFIN
B1
B2
GND
WLP
Bump Description
BUMP
A1
A2
B1
B2
NAME
V
CC
RFOUT
(SHDN)
RFIN
GND
FUNCTION
Supply Voltage. Bypass to ground with a 10pF capacitor as close as possible to the IC.
RF Output/SHDN
Input. RFOUT is internally matched to 50Ω and pulled up to V
CC
through a 1MΩ
resistor.
SHDN
is shared with the RFOUT bump. The devices are in active mode by default once V
CC
is applied. RFOUT(SHDN) can be pulled to a DC low externally to shut down the IC.
RF Input. Requires a DC-blocking capacitor and external matching components.
Ground. Connect to the PCB ground plane.
Detailed Description
The MAX2686/MAX2688 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, ultra-low-noise figure, and excellent linearity.
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. Tables 1 and
2 list typical device S parameters and K
f
values. Typical
noise parameters are shown in Tables 3 and 4.
Shutdown
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 Application
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 coupling
The devices include an optional shutdown feature to turn
off the entire chip. The devices are placed in active mode
by default once V
CC
is applied, due to the on-chip pull-
up resistor to V
CC
at the RFOUT bump (shared with the
SHDN
input). 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
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