MAXIM MAX2687, MAX2689, MAX2694 Technical data

19-6040; Rev 1; 5/12

EVALUATION KIT

AVAILABLE

GPS/GNSS Low-Noise Amplifiers

General Description

The MAX2687/MAX2689/MAX2694 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. The MAX2687/
MAX2689/MAX2694 provide high gains of 12dB, 15dB,
and 18dB, respectively. Each is optimized for high
linearity.

The devices operate from a +1.6V to +3.6V single sup­ply. The optional shutdown feature in the devices reduc­es the supply current to less than 10FA. 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

Automotive Navigation

Telematics (Asset Tracking and Management)

Personal Navigation Devices (PNDs)

Cellular Phones with GPS

Notebook PCs/Ultra-Mobile PCs

Recreational, Marine Navigation

Avionics

Watches

Digital Cameras

MAX2687/MAX2689/MAX2694

Features

S High Power Gain: 17.8dB (MAX2687)

S Low Noise Figure: 0.85dB (MAX2687)

S Integrated 50Ω Output Matching Circuit

S Low Supply Current: 4.5mA (MAX2694)

S Wide Supply Voltage Range: 1.6V to 3.6V

S Low Bill of Materials: One Inductor, Two

Capacitors

S Small Footprint: 0.86mm x 0.86mm

S 0.4mm-Pitch Wafer-Level Package (WLP)

Ordering Information appears at end of data sheet.

Typical Application Circuit

V

V

CC

C1

RF

INPUT

_______________________________________________________________ Maxim Integrated Products 1

CC

A1 A2

C2

MAX2687
MAX2689

L1

MAX2694

RFIN

B1 B2

MAX2687
MAX2694

L1 = 4.7nH
C1 = 100nF
C2 = 10pF

MAX2689

L1 = 5.8nH
C1 = 100nF
C2 = 10pF

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.

RFOUT

RF
OUTPUT

R1
25kI

OPTIONAL SHUTDOWN

GND

SHDN

GPS/GNSS Low-Noise Amplifiers

ABSOLUTE MAXIMUM RATINGS

VCC to GND .......................................................... -0.3V to +3.6V

Other Pins to GND ...............-0.3V to (+ Operating VCC + 0.3V)

Maximum RF Input Power ............................................... +5dBm

Continuous Power Dissipation (TA = +70°C)

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
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.

PACKAGE THERMAL CHARACTERISTICS (Note 2)

WLP

Junction-to-Ambient Thermal Resistance (qJA) ........103°C/W

Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-

layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.

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

DC ELECTRICAL CHARACTERISTICS

(MAX2687/MAX2689/MAX2694 EV kit, VCC = 1.6V to 3.6V, TA = -40NC to +85NC, no RF signals are applied. Typical values are at VCC
= 2.85V and TA = +25NC, unless otherwise noted.) (Note 3)

MAX2687/MAX2689/MAX2694

Supply Voltage 1.6 2.85 3.6 V

Supply Current

Digital Input Logic-High (Note 4) 1.2 V
Digital Input Logic-Low (Note 4) 0.45 V

PARAMETER CONDITIONS MIN TYP MAX UNITS

MAX2687 7.6

SHDN = high

MAX2694 4.5

Shutdown mode, V

SHDN

= 0V

20 µA

AC ELECTRICAL CHARACTERISTICS

(MAX2687/MAX2689/MAX2694 EV kit, VCC = 1.6V to 3.6V, TA = -40NC to +85NC, f

2.85V and TA = +25NC, unless otherwise noted.) (Note 3)

PARAMETER CONDITIONS MIN TYP MAX UNITS

RF Frequency L1 band 1575.42 MHz

MAX2687 14.7 17.8

VCC = 2.85V (Note 5)

Power Gain

VCC = 1.6V

MAX2689 12.1 15.1
MAX2694 11.9 11.6
MAX2687 14.0 17.7
MAX2689 11.8 15
MAX2694 8.7 11.5

= 1575.42MHz. Typical values are at VCC =

RFIN

mAMAX2689 7.6

dB

2

GPS/GNSS Low-Noise Amplifiers

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2687/MAX2689/MAX2694 EV kit, VCC = 1.6V to 3.6V, TA = -40NC to +85NC, f

2.85V and TA = +25NC, unless otherwise noted.) (Note 3)

PARAMETER CONDITIONS MIN TYP MAX UNITS

MAX2687 0.85

Noise Figure VCC = 1.6V to 3.3V

MAX2694 0.97

In-Band 3rd-Order Input
Intercept Point

Out-of-Band 3rd-Order Input
Intercept Point

Input 1dB Compression Point (Note 8)

Input Return Loss

Output Return Loss

Reverse Isolation

Note 3: 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 4: Min and max limits guaranteed by test at TA = +25°C.
Note 5: Min limit guaranteed by design and characterization.
Note 6: Measured with the two tones located at 1MHz and 2MHz offset from the center of the GPS band with -27dBm/tone for the

MAX2687, -30dBm/tone for the MAX2689, and -24dBm/tone for the MAX2694.

Note 7: Measured with input tones at 1713MHz (-27dBm) and 1851MHz (-39dBm).
Note 8: Measured with a tone located at the center of the GPS band.

(Note 6)

(Note 7)

MAX2687 7.8

MAX2694 16.8
MAX2687 20.7

MAX2694 11.6
MAX2687 43.9
MAX2689 43.3
MAX2694 21.5

MAX2687 5.5

MAX2694 6.85
MAX2687 9.146

MAX2694 8.644
MAX2687 -9.3
MAX2689 -8.9
MAX2694 -2.25

= 1575.42MHz. Typical values are at VCC =

RFIN

dBMAX2689 1.2

dBmMAX2689 5.1

dBmMAX2689 8

dBm

dBMAX2689 9

dBMAX2689 15.2

dB

MAX2687/MAX2689/MAX2694

3

GPS/GNSS Low-Noise Amplifiers

Typical Operating Characteristics

(MAX2687/MAX2689/MAX2694 EV kit. Typical values are at VCC = 2.85V, TA = +25°C, and f

MAX2687

= 1575.42MHz, unless otherwise noted.)

RFIN

INPUT RETURN LOSS vs. FREQUENCY

0

-2

-4

-6

-8

-10

|S11| (dB)

-12

-14

-16

-18

-20
500 2500

FREQUENCY (MHz)

200015001000

MAX2687 toc01

20

18

16

14

12

10

GAIN (dB)

8

6

4

2

0

500 2500

GAIN vs. FREQUENCY

FREQUENCY (MHz)

IN-BAND IIP3 vs. SUPPLY VOLATAGE

OUTPUT RETURN LOSS vs. FREQUENCY

MAX2687 toc04

10

8

6

IIP3 (dBm)

4

2

5

0

-5

MAX2687/MAX2689/MAX2694

-10

|S22| (dB)

-50

-20

AND TEMPERATURE

TA = -40°C

TA = +25°C

TA = +85°C

REVERSE ISOLATION vs. FREQUENCY

-20

-30

MAX2687 toc02

-40

-50

MAX2687 toc03

|S12| (dB)

-60

-70

200015001000

-80
500 2500

FREQUENCY (MHz)

200015001000

OUT-OF-BAND IIP3 vs. SUPPLY VOLTAGE

AND TEMPERATURE

16

fTONE 1 = 1713MHz
PTONE 1 = -27dBm

MAX2687 toc05

14

12

10

IIP3 (dBm)

8

6

fTONE 2 = 1851MHz
PTONE 2 = -39dBm

+85°C

+25°C

-40°C

MAX2687 toc06

-25
500 2500

FREQUENCY (MHz)

INPUT P1dB vs. SUPPLY VOLATAGE

AND TEMPERATURE

-10

-11

-12

-13

INPUT P1dB (dBm)

-14

-15

1.6 3.6

TA = -40°C

4

200015001000

TA = +25°C

TA = +85°C

SUPPLY VOLTAGE (V)

0

1.6 3.6
SUPPLY VOLTAGE (V)

MAX2687 toc07

3.43.23.02.82.62.42.22.01.8

3.43.23.02.82.62.42.22.01.8

4

SUPPLY VOLTAGE (V)

1dB GAIN DESENSE

vs. BLOCKER FREQUENCY

0

-5

-10

-15

-20

|BLOCKER POWER| (dBm)

-25

-30
500 2500

BLOCKER FREQUENCY (MHz)

200015001000

3.43.23.02.82.62.42.22.01.81.6 3.6

MAX2687 toc08