MAXIM MAX2642, MAX2643 Technical data

General Description

The MAX2642/MAX2643 evaluation kits (EV kits) simplify
evaluation of the MAX2642 and MAX2643 low-noise
amplifiers (LNAs). These kits enable testing of the
devices’ performance and require no additional support
circuitry. The signal input and output use SMA connectors
to facilitate connection of RF test equipment.

The MAX2642/MAX2643 EV kits are fully assembled
with the MAX2642 or MAX2643 on board, and incorporate
input matching components optimized for 900MHz
operation.

Features

♦ Easy Evaluation of MAX2642/MAX2643

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

♦ RF Input and Output Matched to 50Ω at 900MHz

♦ Jumper Included for Gain/Shutdown Setting

♦ Fully Assembled and Tested

Evaluate: MAX2642/MAX2643

MAX2642/MAX2643 Evaluation Kits

________________________________________________________________ Maxim Integrated Products 1

19-1682; Rev 0; 4/00

Component List

Ordering Information

Component Suppliers

For free samples and the latest literature, visit www.maxim-ic.com or phone [phone].
For small orders, phone [phone].

查询MAX2642EVKIT供应商

DESIGNATION QTY DESCRIPTION

470pF ±5% ceramic cap (0603)

C1 1

C2 1

C3 0 Not installed

C4, C5 2

C6 1

C7 1 4.7µF ceramic capacitor (0805)

L1 1

R1 1 511Ω ±1% resistor (0603)

R2 1

R3 0 Not installed

Murata GRM39X7R471K050 or
Taiyo Yuden UMK107 B471KZ

3.3pF ±5% ceramic cap (0603)
Murata GRM39COG3R3B050

100pF ±5% ceramic caps (0603)
Murata GRM39COG101J050 or
Taiyo Yuden UMK107CH101JZ

47pF ±5% ceramic cap (0603)
Murata GRM39COG470J050 or
Taiyo Yuden UMK107CH470JZ

8.7nH inductor (0603)
Coilcraft 0603CS-8N7XJBC

33kΩ ± 5% r esi stor (0603) ( MAX 2642)
10kΩ ± 5% r esi stor (0603) ( MAX 2643)

TEMP.

PART

MAX2642EVKIT -40°C to +85°C SC70-6 AAC

MAX2643EVKIT -40°C to +85°C SC70-6 AAD

SUPPLIERS PHONE FAX WEB

Coilcraft 847-639-6400 847-639-1469

M ur ata
E l ectr oni cs

Tai yo Y ud en 800-348-2496 408-434-0375

800-831-9172 814-238-0490

RANGE

IC
PACKAGE

www.coilcraft.

www.murata.

t-yuden.com

TOP

MARK

com

com

www.

R4 1 0Ω resistor

VCC, GND 2 2-pin headers

JU1 0 Not installed

JU2 1 3-pin header

RFIN, RFOUT 2 Edge-mount SMA connectors

U1 1

Maxim MAX2642EXT-T or
MAX2643EXT-T IC (6-pin SC70)

Evaluate: MAX2642/MAX2643

MAX2642/MAX2643 Evaluation Kits

2 _______________________________________________________________________________________

Quick Start

The MAX2642/MAX2643 EV kits are fully assembled and
factory tested. Follow the instructions in the Connections
and Setup section for proper device evaluation.

Test Equipment Required

• An RF signal generator capable of delivering -10dBm
of output power and a frequency range covering the
MAX2642/MAX2643 (800MHz to 1000MHz, for exam­ple)

• An RF spectrum analyzer that covers the operating
frequency range

• A DC power supply capable of supplying +2.7V to
+5.5V

• Two 50Ω coaxial cables with SMA connectors

• An ammeter to measure supply current (optional)

• A noise figure meter (optional)

• A network analyzer for measuring gain and return

loss (optional)

Connections and Setup

Checking Power Gain

1) Connect a DC supply (preset to +3.0V) to the V

CC

and GND terminals (through an ammeter, if desired)
on the EV kit.

2) Set the RF generator for an output frequency of
900MHz at a power level of -30dBm. Connect the RF
generator’s output to the RFIN SMA connector.

3) Connect the coaxial cable from the RFOUT SMA con­nector to the spectrum analyzer.

4) Turn on the DC supply. The supply current should
read approximately 5mA (if using an ammeter).

5) Activate the RF generator’s output. A signal on the
spectrum analyzer’s display should indicate a typical
gain of +17dB after accounting for cable and board
losses.

6) Optional: For the MAX2642, set the jumper JU2 to the
VCCposition. The power gain should now be
+3.5dB.

7) Optional: Another method of determining gain is by
using a network analyzer. This has the advantage of
displaying gain vs. a swept frequency band, in addi­tion to displaying input and output return loss. Refer
to the user manual of the network analyzer for setup
details.

Checking Noise Figure

Noise figure measurements on low-noise devices such
as the MAX2642/MAX2643 are extremely sensitive to
board and lab setup losses and parasitics. There are
many techniques and precautions for measuring low
noise figure. A detailed explanation of these items
would exceed the scope of this document. Take into
account PC board and external components loss when
performing noise-figure measurements. The typical
input losses on these EV kits is 0.25dB. For more infor­mation on how to perform this level of noise-figure mea­surement, refer to the noise-figure meter operating
manual and to Hewlett Packard’s application note #57-2,
Noise Figure Measurement Accuracy.

Layout Considerations

Good PC board layout is an essential part of an RF cir­cuit’s design. The EV kit PC board can serve as a guide
for laying out a board using the MAX2642/MAX2643.
Generally, the VCCnode on the PC board should have
a decoupling capacitor located close to the device,
and additional capacitors may be needed for long V

CC

lines. This minimizes supply coupling. Proper grounding
of the GND pins is essential. Connect the GND pins to
the ground plane either directly, through vias, or both.