Rainbow Electronics MAX2641 User Manual

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General Description

The MAX2640/MAX2641 are low-cost, ultra-low-noise
amplifiers designed for applications in the cellular, PCS,
GPS, and 2.4GHz ISM frequency bands. Operating from
a single +2.7V to +5.5V supply, these devices consume
only 3.5mA of current while providing a low noise fig­ure, high gain, high input IP3, and an operating fre­quency range that extends from 400MHz to 2500MHz.

The MAX2640 is optimized for 400MHz to 1500MHz
applications, with a typical performance of 15.1dB gain,
input IP3 of -10dBm, and a noise figure of 0.9dB at
900MHz. The MAX2641 is optimized for 1400MHz to
2500MHz applications, with a typical performance of

14.4dB gain, an input IP3 of -4dBm, and a noise figure
of 1.3dB at 1900MHz.

These devices are internally biased, eliminating the
need for external bias resistors and chokes. In a typical
application, the only external components needed are a
two-element input match, input and output blocking
capacitors, and a VCCbypass capacitor.

The MAX2640/MAX2641 are designed on a high-fre­quency, low-noise, advanced silicon-germanium
process and are offered in the space-saving 6-pin
SOT23 package.

Applications

400MHz/900MHz/2.4GHz ISM Radios
Cellular/PCS Handsets
GPS Receivers
Cordless Phones
Wireless LANs
Wireless Data

Features

♦ Wide Operating Frequency Range

MAX2640: 400MHz to 1500MHz
MAX2641: 1400MHz to 2500MHz

♦ Low Noise Figure

MAX2640: 0.9dB at 900MHz
MAX2641: 1.2dB at 1575MHz

1.3dB at 1900MHz

1.5dB at 2450MHz

♦ High Gain

MAX2640: 15.1dB at 900MHz
MAX2641: 15.7dB at 1575MHz

14.4dB at 1900MHz

13.5dB at 2450MHz

♦ High Reverse Isolation

MAX2640: 40dB at 900MHz
MAX2641: 31dB at 1575MHz

30dB at 1900MHz
24dB at 2450MHz

♦ +2.7V to +5.5V Single-Supply Operation
♦ Low 3.5mA Supply Current
♦ Ultra-Small SOT23-6 Package

MAX2640/MAX2641

400MHz to 2500MHz SiGe

Ultra-Low-Noise Amplifiers

________________________________________________________________

Maxim Integrated Products

1

C3

C4

Z1

RFIN

C1

V

CC

V

CC

RFIN

C2

ZM1

BIAS GENERATOR

GND

LNA

RF OUT

RF OUT

MAX2640/1

ZM2

*The series inductor Z1 can be replaced by a transmission line of appropriate impedance

and electrical length.

FREQUENCY (MHz)

C1

VALUE

(pF)

C2

VALUE

(pF)

C3

VALUE

(pF)

C4

VALUE

(pF)

Z1*

VALUE

(nH)

ZM1

VALUE

(pF)

ZM2

VALUE

MAX2640 MAX2641

900

—
—
—

—
1575
1900
2450

470
100
470
470

3
100
100
100

470
470
470
470

—
—
—

100

9.85

5.6

2.55

1.65

2
1
1
1

—

6.8nH
1pF
1pF

Typical Operating Circuits

19-1384; Rev 1; 2/99

PART

MAX2640EUT-T
MAX2641EUT-T

-40°C to +85°C

-40°C to +85°C

TEMP.

RANGE

PIN-

PACKAGE

6 SOT23-6
6 SOT23-6

EVALUATION KIT

FOLLOWS DATA SHEET

Ordering Information

SOT

TOP MARK

AAAV

AAAW

Pin Configuration appears at end of data sheet.

MAX2640/MAX2641

400MHz to 2500MHz SiGe
Ultra-Low-Noise Amplifiers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +5.5V, TA= T

MIN

to T

MAX,

unless otherwise noted. Typical values are at VCC= +3.0V, TA= +25°C.)

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.

VCCto GND .............................................................-0.3V to +6V

RFIN Power (50Ω source) (Note 1) ..................................+5dBm

Continuous Power Dissipation (T

A

= +70°C)

SOT23-6 (derate 8.7mW/°C above +70°C)..................696mW

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

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

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

Lead Temperature (soldering, 10sec).............................+300°C

T

A

= +25°C

CONDITIONS

mA

3.5 4.7

V2.7 5.5Operating Supply Voltage

Operating Supply Current

UNITSMIN TYP MAXPARAMETER

(Note 6)

(Note 5)

(Note 4)

TA= T

MIN

to T

MAX

TA= T

MIN

to T

MAX

(Note 4)

CONDITIONS

dBm-4Input Third-Order Intercept Point

dBm-21Input 1dB Gain Compression Point

dB30Reverse Isolation

dB-12Output Return Loss

dB-12Input Return Loss

dB1.3 1.5Noise Figure

dB0.9 2.4Gain Variation Over Temperature

dB12.4 14.4Gain

MHz1400 2500RFIN Frequency Range

dB12.8 15.1Gain

MHz400 1500RFIN Frequency Range

dBm-10Input Third-Order Intercept Point

dBm-22Input 1dB Gain Compression Point

dB40Reverse Isolation

dB0.6 1.7Gain Variation Over Temperature
dB0.9 1.1Noise Figure
dB-11Input Return Loss
dB-14Output Return Loss

UNITSMIN TYP MAXPARAMETER

RF ELECTRICAL CHARACTERISTICS

(VCC= +3.0V, P

RFIN

= -34dBm, ZO= 50Ω, TA= +25°C, unless otherwise noted.) (Notes 2 and 3)

MAX2640 (f

RFIN

= 900MHz)

MAX2641 (f

RFIN

= 1900MHz)

Note 1: Pin must be AC-coupled with a DC blocking capacitor.

TA= -40°C to +85°C 6.4

MAX2640/MAX2641

400MHz to 2500MHz SiGe

Ultra-Low-Noise Amplifiers

_______________________________________________________________________________________ 3

Note 2: Guaranteed by design and characterization.
Note 3: Measured using typical operating circuit. Input and output impedance matching networks were optimized for best simulta-

neous gain and noise-figure performance.

Note 4: External component and circuit losses degrade noise-figure performance. Specification excludes external component and

circuit board losses.

Note 5: Measured with two input tones, f

1

= 899MHz, f2= 901MHz, both at -34dBm per tone.

Note 6: Measured with two input tones, f

1

= 1899MHz, f2= 1901MHz, both at -34dBm per tone.

Note 7: Measured with two input tones, f

1

= 1574MHz, f2= 1576MHz, both at -34dBm per tone.

Note 8: Measured with two input tones, f

1

= 2449MHz, f2= 2451MHz, both at -34dBm per tone.

RF ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0V, P

RFIN

= -34dBm, ZO= 50Ω, TA= +25°C, unless otherwise noted.) (Notes 2 and 3)

(Note 7)

(Note 4)

CONDITIONS

dBm+1.4Input Third-Order Intercept Point

dBm-21Input 1dB Gain Compression Point

dB-31Reverse Isolation

dB15.7Gain
dB1.2Noise Figure
dB-8Input Return Loss
dB-15Output Return Loss

UNITSMIN TYP MAXPARAMETER

(Note 8)

(Note 4)

dBm-2.5Input Third-Order Intercept Point

dBm-19Input 1dB Gain Compression Point

dB-24Reverse Isolation

dB13.5Gain
dB1.5Noise Figure
dB-10Input Return Loss
dB-11Output Return Loss

MAX2641 (f

RFIN

= 1575MHz)

MAX2641 (f

RFIN

= 2450MHz)

0

2

1

4

3

5

6

24356

MAX2640

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX2640-01

VCC (V)

I

CC

(mA)

TA = +85°C

TA = +25°C

TA = -40°C

12

13

15

14

16

800 840 880 920 960 1000

MAX2640 MATCHED AT 900MHz

GAIN vs. FREQUENCY

MAX2640-01

FREQUENCY (MHz)

GAIN (dB)

TA = -40°C

TA = +25°C

TA = +85°C

0

1

2

3

800 880840 920 960 1000

MAX2640 MATCHED AT 900MHz

NOISE FIGURE vs. FREQUENCY

MAX2640-03

FREQUENCY (MHz)

NOISE FIGURE (dB)

TA = +85°C

TA = +25°C

TA = -40°C

Typical Operating Characteristics

(VCC= +3V, P

RFIN

= -34dBm, Typical Operating Circuits, TA = +25°C, unless otherwise noted.)