Datasheet

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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 300MHz to 2500MHz.

The MAX2640 is optimized for 300MHz 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

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

315MHz/400MHz/900MHz/2.4GHz ISM Radios

Cellular/PCS Handsets

GPS Receivers

Cordless Phones

Wireless LANs

Wireless Data

Automotive RKE

Features

♦ Wide Operating Frequency Range

MAX2640: 300MHz 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

300MHz to 2500MHz SiGe

Ultra-Low-Noise Amplifiers

________________________________________________________________ Maxim Integrated Products 1

RFIN

ZM1

BIAS GENERATOR

GND

LNA

RF OUT

MAX2640/1

ZM2

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

and electrical length.

FREQUENCY (MHz)

VALUE

(pF)

VALUE

(pF)

VALUE

(pF)

VALUE

(pF)

Z1*

VALUE

(nH)

ZM1

VALUE

(pF)

ZM2

VALUE

MAX2640 MAX2641

900

—

1575

1900

2450

470

100

470

100

470

—

100

9.85

5.6

2.55

1.65

—

6.8nH

1pF

Typical Operating Circuits

19-1384; Rev 3; 4/07

Ordering Information

Pin Configuration appears at end of data sheet.

EVALUATION KIT

AVAILABLE

PART

TEMP

RANGE

PIN-

PACKAGE

SOT

TOP MARK

MAX2640EUT-T

-40°C to +85°C 6 SOT23-6

AAAV

MAX2640EUT+T

-40°C to +85°C 6 SOT23-6

AAAV

MAX2640AUT+T

-40°C to +125°C 6 SOT23-6

AAAV

MAX2641EUT-T

-40°C to +85°C 6 SOT23-6

AAAW

MAX2641EUT+T

-40°C to +125°C 6 SOT23-6

AAAW

+Indicates lead-free package.

Summary of content (9 pages)

PAGE 1
9-1384; Rev 3; 4/07 KIT ATION EVALU LE B A IL A AV 300MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers 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 300MHz to 2500MHz.
PAGE 2
MAX2640/MAX2641 300MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers ABSOLUTE MAXIMUM RATINGS VCC to GND .............................................................-0.3V to +6V RFIN Power (50Ω source) (Note 1) ..................................+5dBm Continuous Power Dissipation (TA = +70°C) SOT23-6 (derate 8.7mW/°C above +70°C)..................696mW Operating Temperature Range MAX2640EUT/MAX2641EUT ...............................-40°C to +85°C MAX2640AUT ...................................................
PAGE 3
00MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers (VCC = +3.0V, PRFIN = -34dBm, ZO = 50Ω, TA = +25°C, unless otherwise noted.) (Notes 2 and 3) PARAMETER CONDITIONS MIN TYP MAX UNITS MAX2641 (fRFIN = 1575MHz) Gain 15.7 dB 1.2 dB Input Return Loss -8 dB Output Return Loss -15 dB Reverse Isolation -31 dB Input 1dB Gain Compression Point -21 dBm +1.4 dBm 13.5 dB Noise Figure (Note 4) Input Third-Order Intercept Point (Note 7) MAX2641 (fRFIN = 2450MHz) Gain Noise Figure 1.
PAGE 4
Typical Operating Characteristics (continued) (VCC = +3V, PRFIN = -34dBm, Typical Operating Circuits, TA = +25°C, unless otherwise noted.) -10 -9 REVERSE ISOLATION (dB) -8 INPUT RETURN LOSS -10 -11 -12 -13 -14 -15 6 5 TA = +85°C -20 4 TA = +25°C ICC (mA) -7 MAX2641 SUPPLY CURRENT vs. SUPPLY VOLTAGE MAX2640-05 0 MAX2640-04 -6 MAX2640 MATCHED AT 900MHz REVERSE ISOLATION vs. FREQUENCY MAX2640-06 MAX2640 MATCHED AT 900MHz INPUT RETURN LOSS AND OUTPUT RETURN LOSS vs.
PAGE 5
300MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers PIN NAME FUNCTION 1 RFIN Amplifier Input. AC-couple to this pin with a DC blocking capacitor. Use recommended input matching network (see Typical Operating Circuit). 2, 3, 5 GND Ground. For optimum performance, provide a low inductance connection to the ground plane. 4 RFOUT 6 VCC Amplifier Output. Use the recommended series blocking or matching capacitor (see Typical Operating Circuit). Supply Voltage.
PAGE 6
MAX2640/MAX2641 300MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers Table 1. MAX2640 Typical Scattering Parameters at VCC = +3V, TA = +25°C FREQUENCY (MHz) S11 MAG PHASE S21 MAG PHASE S12 MAG PHASE S22 MAG PHASE 400 0.907 -35.1 4.62 109.1 0.001 13.5 0.302 108.4 500 0.882 -43.1 4.70 90.4 0.001 64.7 0.33 93.6 600 0.858 -50.8 4.76 70.7 0.001 55.2 0.352 81.5 700 0.832 -58.1 4.80 50.6 0.002 39.4 0.365 69.4 800 0.810 -64.9 4.85 29.5 0.004 64.2 0.384 56.
PAGE 7
300MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers MAX2640/MAX2641 Table 3. MAX2640 Typical Noise Parameters at VCC = +3V, TA = +25°C FREQUENCY (MHz) fMIN (dB) ⏐Γ opt⏐ Γ opt ANGLE RN (Ω) 400 0.66 0.56 21 12.5 500 0.69 0.54 25 11.9 600 0.72 0.51 30 11.3 700 0.75 0.48 35 10.8 800 0.78 0.46 40 10.2 900 0.82 0.43 45 9.7 1000 0.85 0.40 50 9.3 1100 0.89 0.37 56 8.8 1200 0.93 0.35 62 8.3 1300 0.97 0.32 68 7.9 1400 1.01 0.29 77 7.4 1500 1.06 0.26 84 7.
PAGE 8
Pin Configuration TOP VIEW RFIN 1 GND 2 MAX2640 MAX2641 GND 3 6 VCC 5 GND 4 RFOUT SOT23-6 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 6LSOT.
PAGE 9
300MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers PACKAGE OUTLINE, SOT 6L BODY 21-0058 I 2 2 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.