Analog-Devices-Inc–Maxim-Integrated-MAX2691EWS-T
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19-6158; Rev 0; 12/11
E V A L U A T I O N
K I T
A V A I L A B L E
General Description
Features
The MAX2691 low-noise amplifier (LNA) is designed for
GPS L2 applications. Designed in Maxim’s advanced
SiGe process, the device achieves high gain and
low noise figure while maximizing the input-referred 1dB
compression point and the 3rd-order intercept point. The
MAX2691 provides a high gain of 17.5dB and sub 1dB
noise figure.
S
High-Power Gain: 17.5dB
S
Low-Noise Figure: 0.93dB
S
Integrated 50
Ω
Output Matching Circuit
S
Low Supply Current: 4.3mA
S
Wide Supply Voltage Range: 1.6V to 3.6V
S
Low Bill of Materials: One Inductor, Two
The device operates from a +1.6V to +3.6V single sup-
ply. The optional shutdown feature in the device reduces
the typical supply current to 4
F
A. The device is available
in a very small, lead-free, RoHS-compliant, 0.86mm x
0.86mm x 0.65mm wafer-level package (WLP).
Capacitors
S
Small Footprint: 0.86mm x 0.86mm
S
Thin Profile: 0.65mm
S
0.4mm-Pitch Wafer-Level Package (WLP)
Applications
Ordering Information
appears at end of data sheet.
Precision Navigation
For related parts and recommended products to use with this part,
Telematics (Asset Tracking and Management)
Avionics
Typical Application Circuit
MAX2691
RFOUT
V
CC
RF
V
CC
A1
B1
A2
B2
OUTPUT
C2
R1
25k
I
SHDN
OPTIONAL SHUTDOWN
C1
L1
RFIN
RF
GND
INPUT
MAX2691
L1 = 8.2nH
C1 = 100nF
C2 = 10pF
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Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
MAX2691
L2 Band GPS Low-Noise Amplifier
ABSOLUTE MAXIMUM RATINGS
CC
Other Pins to GND
(except RFIN) ……………….-0.3V to (+ Operating V
Maximum Current into RF Input …………………………………..10mA
Maximum RF Input Powe
r
.
………………………………………
.
+
5dBm
V
to GND………………………………………………….-0.3V to +3.6V
Operating Temperature Rang
e
.
……………………. -40°C to +85°C
Junction Temperature ……………………………………………..+150°C
Storage Temperature Range………………………. -65°C to +160°C
Lead Temperature (soldering, 10s) …….
.
R
eflow Profile (Note 1)
Soldering Temperature (reflow) ………………………………..+260°C
+ 0.3V)
CC
Continuous Power Dissipation (T
= +70°C)
A
4-Bump WLP (derates 9.7mW/°C above +70°C) ……..776mW
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 opera-
tion 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
(MAX2691 EV kit, V
= 1.6V to 3.6V, T
= -40°C to +85°C, no RF signals are applied. Typical values are at V
= 2.85V and
CC
CC
A
T
= +25°C, unless otherwise noted.) (Note 2)
A
PARAMETER
CONDITIONS
MIN
TYP
2.85
4.3
MAX
UNITS
Supply Voltage
1.6
3.6
V
mA
µA
V
SHDN
= high
Supply Current
4.0
20
Shutdown mode,
SHDN
= low
Digital Input Logic-High
Digital Input Logic-Low
(Note 3)
(Note 3)
1.2
0.45
V
AC ELECTRICAL CHARACTERISTICS
(MAX2691 EV kit, V
= 1.6V to 3.6V, T
= -40°C to +85°C, f
= 1227MHz. Typical values are at V
= 2.85V and T
= +25°C,
CC
A
RFIN
CC A
unless otherwise noted.) (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
RF Frequency
L2 band
1227
17.5
17.4
0.93
MHz
V
V
V
= 2.85V
13.3
13.1
CC
CC
CC
Power Gain (Note 4)
dB
= 1.6V
Noise Figure
= 1.6V to 3.3V
dB
In-Band 3rd-Order Input
Intercept Point
(Note 5)
(Note 6)
-3.0
dBm
Input 1dB Compression Point
Input Return Loss
-8.5
dBm
dB
10.9
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Maxim Integrated Products
2
MAX2691
L2 Band GPS Low-Noise Amplifier
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2691 EV kit, V
= 1.6V to 3.6V, T
= -40°C to +85°C, f
= 1227MHz. Typical values are at V
= 2.85V and T
= +25°C,
CC
A
RFIN
CC A
unless otherwise noted.) (Note 2)
PARAMETER
Output Return Loss
Reverse Isolation
CONDITIONS
MIN
TYP
MAX
UNITS
dB
15.6
45
dB
Note 2:
Min and max limits guaranteed by test at T
= +25°C and guaranteed by design and characterization at T
= -40°C and
A
A
T
= +85°C, unless otherwise noted.
A
Note 3:
Min and max limits guaranteed by test at T
= +25°C.
A
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 a tone located at 5MHz offset from the center of the GPS band.
Typical Operating Characteristics
(MAX2691 EV kit. Typical values are at V
= 2.85V, T
= +25°C, and f
= 1227MHz, unless otherwise noted.)
CC
A
RFIN
INPUT RETURN LOSS vs. FREQUENCY
GAIN vs. FREQUENCY
REVERSE ISOLATION vs. FREQUENCY
0
20
15
10
5
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-5
-10
-15
-20
-25
-30
-35
-40
-45
0
-5
-10
500
1000
1500
2000
2500
500
1000
1500
2000
2500
500
1000
1500
2000
2500
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
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Maxim Integrated Products
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MAX2691
L2 Band GPS Low-Noise Amplifier
Typical Operating Characteristics (continued)
(MAX2691 EV kit. Typical values are at V
= 2.85V, T
= +25°C, and f
= 1227MHz, unless otherwise noted.)
RFIN
CC
A
INBAND IIP3 vs. SUPPLY VOLTAGE
AND TEMPERATURE
OUTPUT RETURN LOSS vs. FREQUENCY
2
0
-5
TWO TONES LOCATED AT +1MHz AND +2MHz
FROM 1227MHz. P
= -30dBm/TONE
IN
1
0
T
A
= -40°C
-10
-15
-20
-25
-1
-2
-3
-4
T
= +25°C
A
T
= +85°C
A
1.6
2.1
2.6
3.1
3.6
500
1000
1500
2000
2500
SUPPLY VOLTAGE (V)
FREQUENCY (MHz)
1dB GAIN DESENSE vs.
BLOCKER FREQUENCY
INPUT P1dB COMPRESSION vs.
SUPPLY VOLTAGE AND TEMPERATURE
5
0
-6
-8
T
A
= -40°C
T
= +25°C
A
-5
-10
-12
-14
-16
T
= +85°C
A
-10
-15
-20
-25
1.6
2.1
2.6
3.1
3.6
500
1000
1500
2000
2500
SUPPLY VOLTAGE (V)
BLOCKER FREQUENCY (MHz)
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Maxim Integrated Products
4
MAX2691
L2 Band GPS Low-Noise Amplifier
Bump Configuration
TOP VIEW
+
V
RFOUT (SHDN)
GND
A1
B1
A2
B2
CC
MAX2691
RFIN
WLP
Bump Description
BUMP
NAME
FUNCTION
A1
V
Supply Voltage. Bypass to ground with a 10pF capacitor as close as possible to the IC.
CC
RF Output/
SHDN
Input. RFOUT is internally matched to 50
I
and pulled up to V
through a 1M
I
CC
RFOUT
(
SHDN
)
A2
resistor.
SHDN
is shared with the RFOUT bump. The device is in active mode by default once V
CC
is applied. RFOUT(
SHDN
) can be pulled to a DC low through a 25k
I
resistor to shut down the IC.
B1
B2
RFIN
GND
RF Input. Requires a DC-blocking capacitor and external matching components.
Ground. Connect to the PCB ground plane.
mode by default once V
is applied, due to the on-chip
CC
Detailed Description
pullup resistor to V
at the RFOUT bump (shared with
CC
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., 25k
I
, in order not to load the RF
output signal during active operation.
The MAX2691 LNA is designed for GPS L2 applications.
The device features a power-shutdown control mode
to eliminate the need for an external supply switch.
The device achieves high gain, low noise figure, and
excellent linearity.
Applications Information
Input and Output Matching
The MAX2691 requires an off-chip input match. 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 simultane-
ous gain, noise figure, and return loss performance.
Reducing the input coupling capacitor results in a lower
IIP3. The device integrates an on-chip output matching
to 50
I
at the output, eliminating the need for external
matching components.
Table 1
lists typical device S
A properly designed PCB is essential to any RF micro-
wave circuit. Use controlled-impedance lines on all
high-frequency inputs and outputs. Bypass V
with
CC
decoupling capacitors located close to the device. For
long V
lines, it may be necessary to add decoupling
CC
capacitors. Locate these additional capacitors further
away from the device package. Proper grounding of
the GND pin is essential. If the PCB uses a topside RF
ground, connect it directly to the GND pin. For a board
where the ground is not on the component layer, connect
the GND pin to the board with multiple vias close to the
package.
parameters and K
values. Typical noise parameters are
f
shown in
Table 2
.
schematic, Gerber data, PADS layout file, and BOM
information.
Shutdown
The MAX2691 includes an optional shutdown feature to
turn off the entire chip. The device is placed in active
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Maxim Integrated Products
5
MAX2691
L2 Band GPS Low-Noise Amplifier
Table 1. Typical S Parameter Values and K-Factor
S11
PHASE
(DEGREES)
S21
PHASE
(DEGREES)
S12
PHASE
(DEGREES)
S22
PHASE
(DEGREES)
FREQ.
(MHz)
S11 MAG
(dB)
S21 MAG
(dB)
S12 MAG
(dB)
S22 MAG
(dB)
K
f
700
800
-2.1
-2.5
-2.8
-3.1
-3.4
-3.7
-3.7
-3.7
-3.8
-3.8
-3.8
-4.0
-4.1
-4.1
-4.1
-78.1
-87.1
3.5
6.0
-175.7
175.7
163.0
146.2
119.2
83.5
-54.0
-47.7
-55.5
-53.8
-46.3
-46.9
-47.6
-49.4
-49.7
-47.3
-43.5
-44.9
-48.5
-47.7
-44.8
113.3
112.0
85.4
54.0
33.8
15.3
-1.0
-1.3
-1.6
-2.4
-3.9
-8.3
-19.1
-14.2
-10.9
-8.7
-6.9
-5.7
-2.6
-1.6
-1.3
-1.0
-124.9
-143.3
-162.8
175.0
149.5
-126.9
-114.7
-114.4
-118.5
-124.3
-130.2
-157.6
-179.3
163.8
148.8
16.75126
8.847551
22.33037
19.54059
9.366309
9.788318
10.25069
12.09861
12.1323
900
-96.2
8.8
1000
1100
1200
1220
1240
1260
1280
1300
1400
1500
1600
1700
-104.3
-112.3
-119.4
-120.7
-122.4
-123.7
-125.0
-126.6
-133.5
-140.3
-147.6
-154.6
11.7
14.4
16.0
16.1
16.0
15.9
15.6
15.2
13.4
11.3
9.4
75.6
67.9
20.3
14.9
-6.0
60.1
52.8
8.793041
5.277003
4.94144
46.0
19.6
-22.8
-21.4
-23.6
-16.5
18.4
-0.5
6.656188
5.983826
4.18904
-15.6
-28.5
7.8
Table 2. Typical Noise Parameters (V
= 2.85V, T
= +25
N
C)
A
CC
FREQUENCY (MHz)
FMIN (dB)
R
N
(I)
|
G
|
|
G
| ANGLE
OPT
OPT
1200
1210
1220
1230
1240
1250
1260
1270
1280
1290
1300
0.66
0.45
0.45
0.45
0.45
0.45
0.45
0.45
0.45
0.44
0.44
0.44
47
48
48
48
49
49
50
50
50
51
51
8.37
8.35
8.33
8.30
8.28
8.26
8.24
8.22
8.20
8.18
8.17
0.66
0.66
0.66
0.66
0.66
0.66
0.67
0.67
0.67
0.67
Ordering Information
Package Information
For the latest package outline information and land patterns
“+”, “#”, 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.
PART
TEMP RANGE
PIN-PACKAGE
MAX2691EWS+T
-40
N
C to +85
N
C
4 WLP
+
Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
PACKAGE PACKAGE
OUTLINE
NO.
LAND
PATTERN NO.
TYPE
CODE
Chip Information
PROCESS: SiGe BiCMOS
4 WLP
W40A0+1
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Maxim Integrated Products
6
MAX2691
L2 Band GPS Low-Noise Amplifier
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
0
12/11
Initial release
—
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. 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 Products, 120 San Gabriel Drive, Sunnyvale, CA
94086 408-737-7600
7
©
2011 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
