MAXIM MAX2691 Technical data

EVALUATION KIT AVAILABLE

19-6158; Rev 0; 12/11

MAX2691

L2 Band GPS Low-Noise Amplifier

General Description

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.

The device operates from a +1.6V to +3.6V single supply. The optional shutdown feature in the device reduces the typical supply current to 4FA. The device is available in a very small, lead-free, RoHS-compliant, 0.86mm x

0.86mm x 0.65mm wafer-level package (WLP).

Applications

Precision Navigation

Telematics (Asset Tracking and Management)

Avionics

Features

S High-Power Gain: 17.5dB

S Low-Noise Figure: 0.93dB

S Integrated 50Ω 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

Capacitors

S Small Footprint: 0.86mm x 0.86mm

S Thin Profile: 0.65mm

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

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part, refer to www.maxim-ic.com/MAX2691.related.

Typical Application Circuit

INPUT

�� Maxim Integrated Products 1

RFIN

MAX2691

A1 A2

B1 B2

MAX2691

L1 = 8.2nH C1 = 100nF C2 = 10pF

RFOUT

OPTIONAL SHUTDOWN

GND

R1 25kI

RF OUTPUT

SHDN

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.

MAX2691

L2 Band GPS Low-Noise Amplifier

ABSOLUTE MAXIMUM RATINGS

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

Other Pins to GND

(except RFIN) ...................-0.3V to (+ Operating VCC + 0.3V)

Maximum Current into RF Input .........................................10mA

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.

DC ELECTRICAL CHARACTERISTICS

(MAX2691 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 2)

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

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

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

Lead Temperature (soldering, 10s) ........Reflow Profile (Note 1)

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

PARAMETER CONDITIONS MIN TYP MAX UNITS

Supply Voltage 1.6 2.85 3.6 V

Supply Current

Digital Input Logic-High (Note 3) 1.2 V Digital Input Logic-Low (Note 3) 0.45 V

SHDN = high Shutdown mode, SHDN = low

4.3 mA

4.0 20 µA

AC ELECTRICAL CHARACTERISTICS

(MAX2691 EV kit, VCC = 1.6V to 3.6V, TA = -40°C to +85°C, f unless otherwise noted.) (Note 2)

PARAMETER CONDITIONS MIN TYP MAX UNITS

RF Frequency L2 band 1227 MHz

Power Gain (Note 4)

Noise Figure VCC = 1.6V to 3.3V 0.93 dB

In-Band 3rd-Order Input Intercept Point

Input 1dB Compression Point (Note 6) -8.5 dBm

Input Return Loss 10.9 dB

VCC = 2.85V 13.3 17.5

VCC = 1.6V 13.1 17.4

(Note 5) -3.0 dBm

= 1227MHz. Typical values are at VCC = 2.85V and TA = +25°C,

RFIN

�� Maxim Integrated Products 2

MAX2691

L2 Band GPS Low-Noise Amplifier

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2691 EV kit, VCC = 1.6V to 3.6V, TA = -40°C to +85°C, f unless otherwise noted.) (Note 2)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Output Return Loss 15.6 dB

Reverse Isolation 45 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 a tone located at 5MHz offset from the center of the GPS band.

= 1227MHz. Typical values are at VCC = 2.85V and TA = +25°C,

RFIN

Typical Operating Characteristics

(MAX2691 EV kit. Typical values are at VCC = 2.85V, TA = +25°C, and f

INPUT RETURN LOSS vs. FREQUENCY

-5

-10

-15

-20

(dB)

S11

-25

-30

-35

-40

-45 500 2500

FREQUENCY (MHz)

200015001000

MAX2691 toc01

GAIN (dB)

-5

-10 500 2500

GAIN vs. FREQUENCY

FREQUENCY (MHz)

= 1227MHz, unless otherwise noted.)

RFIN

REVERSE ISOLATION vs. FREQUENCY

-10

MAX2691 toc02

-20

-30

-40

(dB)

S12

-50

-60

-70

-80

200015001000

-90 500 2500

MAX2691 toc03

200015001000

FREQUENCY (MHz)

�� Maxim Integrated Products 3

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