MAX2659ELT+ - Hytronics - Product.Network

General Description

The MAX2659 high-gain, low-noise amplifier (LNA) is

designed for GPS, Galileo, and GLONASS applications.

Designed in Maxim’s advanced SiGe process, the

device achieves a 20.5dB gain and an ultra-low-noise

figure of 0.8dB while maximizing the input-referred 1dB

compression point and the 3rd-order intercept point at

-12dBm and -5dBm, respectively.

The MAX2659 operates from a +1.6V to +3.6V single

supply and consumes only 4.1mA. The shutdown fea-

ture in the device reduces the supply current to be less

than 1µA. The MAX2659 is available in a very small,

lead-free, RoHS-compliant, 1.5mm x 1.0mm x 0.75mm,

6-pin µDFN package.

Applications

Automotive Navigation

Location-Enabled Mobile Devices

Telematics (Asset Tracking and Management)

Personal Navigation Device (PND)

Cellular Phones with GPS

Notebook PC/Ultra-Mobile PC

Recreational, Marine Navigation

Avionics

Features

oHigh-Power Gain: 20.5dB

oUltra-Low-Noise Figure: 0.8dB

oIntegrated 50ΩOutput Matching Circuit

oLow Supply Current: 4.1mA

oWide Supply Voltage Range: 1.6V to 3.6V

oLow Bill of Materials

oSmall Footprint: 1.5mm x 1.0mm

oThin Profile: 0.75mm

oLead-Free and RoHS-Compliant Package

MAX2659

GPS/GNSS Low-Noise Amplifier

________________________________________________________________

Maxim Integrated Products

RFIN

GND

RFOUT

BIAS

SHDN

OUTPUT

LOGIC

CONTROL

VCC

INPUT

L1 = 6.8nH

C1 = 470pF

C2 = 33nF

C1 C2

VCC

MAX2659

Pin Configuration/Functional Diagram/Typical Application Circuit

Ordering Information

19-0797; Rev 4; 8/11

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.

Denotes a lead(Pb)-free/RoHS-compliant package.

/V denotes an automotive qualified part.

PART TEMP RANGE PIN-PACKAGE

MAX2659ELT+ -40°C to +85°C 6 µDFN

MAX2659ELT/V+ -40°C to +85°C 6 µDFN

EVALUATION KIT

AVAILABLE

MAX2659

GPS/GNSS Low-Noise Amplifier

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(MAX2659 EV kit; VCC = 1.6V to 3.6V, TA= -40°C to +85°C, no RF signals are applied. Typical values are at VCC = 2.85V and

TA= +25°C, unless otherwise noted.) (Note 1)

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: 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.

Note 2: Guaranteed by design and characterization.

Note 3: Measured with the two tones located at 5MHz and 10MHz offset from the center of the GPS band with -40dBm/tone.

Note 4: Measured with a tone located at 5MHz offset from the center of the GPS band.

VCC to GND...........................................................-0.3V to +4.2V

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

RFIN to GND .........................................................................+1V

Maximum RF Input Power .............................................+10dBm

Continuous Power Dissipation (TA= +70°C)

6-Pin µDFN (derates 2.1mW/°C above +70°C)............167mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +160°C

Lead Temperature (soldering, 10s) .................................+260°C

Soldering Temperature (reflow) .......................................+260°C

PARAMETER CONDITIONS MIN TYP MAX UNITS

Supply Voltage 1.6 2.85 3.6 V

SHDN = high 4.1 5.6 mA

Supply Current Shutdown mode, SHDN = low 1 µA

Digital Input-Logic High 1.1 V

Digital Input-Logic Low 0.4 V

Digital Input Current 1 µA

RFIN DC Voltage SHDN = high 0.83 V

AC ELECTRICAL CHARACTERISTICS

(MAX2659 EV kit; VCC = 1.6V to 3.6V, TA= -40°C to +85°C, fRFIN = 1575.42MHz. Typical values are at VCC = 2.85V and TA= +25°C,

unless otherwise noted.) (Note 1)

PARAMETER CONDITIONS MIN TYP MAX UNITS

RF Frequency L1 band 1575.42 MHz

VCC = 2.85V 17 20.5

Power Gain VCC = 1.6V 16.5 20.5 dB

Noise Figure (Note 2) 0.8 dB

3rd-Order Input Intercept Point (Note 3) -5 dBm

Input 1dB Compression point (Note 4) -12 dBm

Input Return Loss (Note 2) 10 15 dB

Output Return Loss (Note 2) 10 25 dB

Reverse Isolation (Note 2) 32 dB

CAUTION! ESD SENSITIVE DEVICE

MAX2659

GPS/GNSS Low-Noise Amplifier

_______________________________________________________________________________________

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX2659 toc01

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

3.0 3.22.62.42.2

3.7

3.9

4.1

4.3

4.5

3.5

1.6 1.8 2.0 3.4

2.8

+85°C

+25°C

-40°C

GAIN vs. RF FREQUENCY

MAX2659 toc02

RF FREQUENCY (MHz)

GAIN (dB)

2000 225017501250 1500750 1000

-5

-10

500 2500

GAIN vs. SUPPLY VOLTAGE

MAX2659 toc03

SUPPLY VOLTAGE (V)

GAIN (dB)

2.8 3.02.62.2 2.41.8 2.0

20.2

20.4

20.6

20.8

21.0

20.0

1.6 3.43.2

NOISE FIGURE vs. TEMPERATURE

MAX2659 toc04

TEMPERATURE (°C)

NOISE FIGURE (dB)

35 6010-15

0.2

0.4

0.8

0.6

1.0

1.2

-40 85

NOISE FIGURE vs. SUPPLY VOLTAGE

MAX2659 toc05

SUPPLY VOLTAGE (V)

NOISE FIGURE (dB)

2.82.42.0

0.2

0.4

0.8

0.6

1.0

1.2

1.6 3.0 3.22.62.21.8 3.4

INPUT RETURN LOSS

vs. RF FREQUENCY

MAX2659 toc06

RF FREQUENCY (MHz)

INPUT RETURN LOSS |S11| (dB)

175012501000

-25

-20

-10

-15

-5

-30

500 2000 22501500750 2500

OUTPUT RETURN LOSS

vs. RF FREQUENCY

MAX2659 toc07

RF FREQUENCY (MHz)

OUTPUT RETURN LOSS |S22| (dB)

175012501000

-40

-35

-30

-25

-20

-10

-15

-5

-45

500 2000 22501500750 2500

REVERSE ISOLATION

vs. RF FREQUENCY

MAX2659 toc08

RF FREQUENCY (MHz)

REVERSE ISOLATION |S12| (dB)

175012501000

-70

-60

-50

-30

-40

-20

-80

500 2000 22501500750 2500

IIP3 vs. TEMPERATURE

MAX2659 toc09

TEMPERATURE (°C)

IIP3 (dBm)

3510-15

-6.0

-5.5

-5.0

-4.0

-4.5

-3.5

-6.5

-40 60 85

TWO TONES LOCATED AT 5MHz AND

10MHz OFFSET WITH -40dBm/TONE

Typical Operating Characteristics

(MAX2659 EV kit; Typical values are at VCC = 2.85V, TA= +25°C, and fRFIN = 1575.42MHz, unless otherwise noted.)

MAX2659

GPS/GNSS Low-Noise Amplifier

4 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(MAX2659 EV kit; Typical values are at VCC = 2.85V, TA= +25°C, and fRFIN = 1575.42MHz, unless otherwise noted.)

IIP3 vs. SUPPLY VOLTAGE

MAX2659 toc10

SUPPLY VOLTAGE (V)

IIP3 (dBm)

2.6 2.82.42.22.01.8

-7

-6

-4

-5

-3

-8

1.6 3.0 3.2 3.4

TWO TONES LOCATED AT 5MHz AND

10MHz OFFSET WITH -40dBm/TONE

INPUT P1dB COMPRESSION

vs. TEMPERATURE

MAX2659 toc11

TEMPERATURE (°C)

P1dB COMPRESSION (dBm)

3510-15

-14

-13

-10

-11

-12

-9

-15

-40 60 85

INPUT P1dB COMPRESSION

vs. SUPPLY VOLTAGE

MAX2659 toc12

SUPPLY VOLTAGE (V)

P1dB COMPRESSION (dBm)

2.82.4 2.61.8 2.0 2.2

-18

-16

-10

-12

-14

-8

-20

1.6 3.0 3.2 3.4

INPUT P1dB COMPRESSION

vs. JAMMER FREQUENCY

MAX2659 toc13

JAMMER FREQUENCY (MHz)

P1dB COMPRESSION (dBm)

17501500750 1000 1250

-25

-20

-5

-10

-15

-30

500 2000 2250 2500

NF vs. JAMMER POWER AT 850MHz

MAX2659 toc14

JAMMER POWER (dBm)

NF (dB)

-15-25 -20

0.5

1.0

1.5

3.0

2.5

2.0

3.5

-30 -10 -5

NF vs. JAMMER POWER AT 1850MHz

MAX2659 toc15

JAMMER POWER (dBm)

NF (dB)

-15-25 -20

0.5

1.0

1.5

3.0

2.5

2.0

3.5

-30 -10

Detailed Description

The MAX2659 is an LNA designed for GPS L1,

GALILEO, and GLONASS applications. The device fea-

tures a power-shutdown control mode to eliminate the

need for an external supply switch. The device

achieves a 20.5dB gain and an ultra-low-noise figure of

0.8dB. The MAX2659 consumes approximately 4.1mA

while providing a IP1dB of -12dBm and an IIP3 of -5dBm.

Input and Output Matching

The MAX2659 requires an off-chip input matching. Only

a 6.8nH inductor in series with a DC-blocking capacitor

is needed to form the input matching circuit. The

Typical Application Circuit

diagram shows the recom-

mended input-matching network. These values are

optimized for the best simultaneous gain, noise figure,

and return loss performance. Table 1 lists typical

device S11 values. The MAX2659 integrates an on-chip

output matching to 50Ωat the output, eliminating the

need for external matching components.

Shutdown

The MAX2659 includes a shutdown feature to turn off

the entire chip. Apply a logic high to SHDN pin to place

the part in the active mode and a logic low to place the

part in the shutdown mode.

Applications Information

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 decoupling capacitors located close to the device.

For long VCC lines, it may be necessary to add decou-

pling capacitors. Locate these additional capacitors

further away from the device package. Proper ground-

ing of the 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.

Chip Information

PROCESS: SiGe BiCMOS

MAX2659

GPS/GNSS Low-Noise Amplifier

_______________________________________________________________________________________ 5

Pin Description

PIN NAME FUNCTION

1, 2 GND Ground. Connect to the PCB ground plane.

3 RFIN RF Input. Requires a DC-blocking capacitor and external matching components.

4 VCC Supply Voltage. Bypass to ground with a 33nF capacitor as close as possible to the IC.

5SHDN Shutdown Input. A logic-low disables the device.

6 RFOUT RF Output. RFOUT is internally matched to 50and incorporates an internal DC-blocking capacitor.

Table 1. Typical S11 Values

FREQUENCY (MHz) REAL S11 IMAGINARY S11

1000 -0.58 -j0.52

1100 -0.68 -j0.356

1200 -0.74 -j0.16

1300 -0.74 j0.036

1400 -0.676 j0.22

1500 -0.56 j0.36

1575 -0.47 j0.415

1600 -0.44 j0.43

1700 -0.36 j0.467

1800 -0.3 j0.51

1900 -0.228 j0.567

2000 -0.14 j0.622

Package Information

For the latest package outline information and land patterns

(footprints), go to www.maxim-ic.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.

6 µDFN L611+2 21-0147 90-0084

MAX2659

GPS/GNSS Low-Noise Amplifier

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.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________

Revision History

REVISION

NUMBER

REVISION

DATE DESCRIPTION PAGES

CHANGED

0 4/07 Initial release —

1 5/08 Updated Digital Input-Logic High specification and added RFIN DC

Voltage specification in DC Electrical Characteristics table 2

2 9/09 Added MAX2659ELT/V+ to Ordering Information 1

3 1/11 Updated maximum supply voltage specification to 3.6V 1, 2

4 8/11 Updated Absolute Maximum Ratings to reflect correct RFIN voltage 2