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Rainbow Electronics MAX2641 User Manual

General description, Applications, Features

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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 fig-
ure, high gain, high input IP3, and an operating fre-
quency 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 V

CC

bypass capacitor.

The MAX2640/MAX2641 are designed on a high-fre-
quency, 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

Z

M1

BIAS GENERATOR

GND

LNA

RF OUT

RF OUT

MAX2640/1

Z

M2

*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

MAX2640

EUT-T

MAX2641

EUT-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.