General Description

The MAX2642/MAX2643 low-cost, high third-order inter-

cept point (IP3), low-noise amplifiers (LNAs) are

designed for applications in cellular, ISM, SMR, and

PMR systems. They feature a programmable bias,

allowing the IP3 and supply current to be optimized for

specific applications. These LNAs provide up to 0dBm

input IP3 while maintaining a low noise figure of 1.3dB.

The gain for these devices is typically 17dB. The

MAX2642 also features a 13dB attenuation step, which

extends the LNA’s dynamic range. Both devices feature

a shutdown mode that minimizes power consumption.

On-chip output matching saves board space by reduc-

ing the number of external components.

The MAX2642/MAX2643 are designed on a low-noise,

advanced silicon-germanium (SiGe) process technolo-

gy. They operate from a +2.7V to +5.5V single supply

and are available in the ultra-small 6-pin SC70 package.

________________________Applications

800MHz/900MHz Cellular Phones

900MHz Cordless Phones

868MHz/900MHz ISM-Band Wireless Data

PMR/SMR/LMR

Features

o Wide Frequency Range: 800MHz to 1000MHz

o High Output IP3 and Adjustable

+17dBm at 5.3mA

+7dBm at 2.8mA

o Low Noise Figure: 1.3dB at 900MHz

o 13dB Attenuation Step (MAX2642)

o On-Chip Output Matching

o Low-Power Shutdown Mode

o +2.7V to +5.5V Single-Supply Operation

o Ultra-Small SC70-6 Package

900MHz SiGe, High IP3,

Low-Noise Amplifiers

________________________________________________________________ Maxim Integrated Products

1

GND

RFIN

16

RFOUT

5

GND

BIAS

MAX2642

MAX2643

SC70-6

TOP VIEW

2

34

Pin Configuration

19-1682; Rev 0; 4/00

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

EVALUATION

KIT MANUAL

FOLLOWS

DATA

SHEET

Ordering Information

6 SC70-6

PIN-

PACKAGE

TEMP. RANGE

-40°C to +85°C

MAX2642EXT-T

PART

AAC

TOP

MARK

6 SC70-6

-40°C to +85°C

MAX2643EXT-T

AAD

MAX2642

MAX2643

RF

INPUT

GND

RFIN

RFOUT

( ) ARE FOR MAX2643.

C1

3.3pF

L1

8.7nH

BIAS

47pF

510

Ω

RF

OUTPUT

33k

(10k)

LOW GAIN

(ENABLE)

HIGH GAIN

(SHUTDOWN)

BIAS

Typical Operating Circuit