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19-1682; Rev 0; 4/00
MAX2642/MAX2643 Evaluation Kits
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
o Easy Evaluation of MAX2642/MAX2643 o +2.7V to +5.5V Single-Supply Operation o RF Input and Output Matched to 50 at 900MHz o Jumper Included for Gain/Shutdown Setting o Fully Assembled and Tested
Evaluate: MAX2642/MAX2643
Component List
DESIGNATION C1 QTY 1 DESCRIPTION 470pF 5% ceramic cap (0603) Murata GRM39X7R471K050 or Taiyo Yuden UMK107 B471KZ 3.3pF 5% ceramic cap (0603) Murata GRM39COG3R3B050 Not installed 100pF 5% ceramic caps (0603) Murata GRM39COG101J050 or Taiyo Yuden UMK107CH101JZ 47pF 5% ceramic cap (0603) Murata GRM39COG470J050 or Taiyo Yuden UMK107CH470JZ 4.7F ceramic capacitor (0805) 8.7nH inductor (0603) Coilcraft 0603CS-8N7XJBC 511 1% resistor (0603) 33k 5% resistor (0603) (MAX2642) 10k 5% resistor (0603) (MAX2643) Not installed 0 resistor 2-pin headers Not installed 3-pin header Edge-mount SMA connectors Maxim MAX2642EXT-T or MAX2643EXT-T IC (6-pin SC70) Coilcraft Murata Electronics Taiyo Yuden PART MAX2642EVKIT MAX2643EVKIT
Ordering Information
TEMP. RANGE -40C to +85C -40C to +85C IC PACKAGE SC70-6 SC70-6 TOP MARK AAC AAD
C2 C3 C4, C5
1 0 2
C6 C7 L1 R1 R2 R3 R4 VCC, GND JU1 JU2 RFIN, RFOUT U1
1 1 1 1 1 0 1 2 0 1 2 1
Component Suppliers
SUPPLIERS PHONE FAX WEB www.coilcraft. com www.murata. com www. t-yuden.com 847-639-6400 847-639-1469 800-831-9172 814-238-0490 800-348-2496 408-434-0375
________________________________________________________________ Maxim Integrated Products
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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.
MAX2642/MAX2643 Evaluation Kits Evaluate: MAX2642/MAX2643
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. 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.
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 50 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 VCC 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 V CC position. The power gain should now be +3.5dB.
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 VCC node on the PC board should have a decoupling capacitor located close to the device, and additional capacitors may be needed for long VCC 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.
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MAX2642/MAX2643 Evaluation Kits Evaluate: MAX2642/MAX2643
VCC
C4 100pF R3 OPEN
JU2 R2 33k (MAX2642) 10k (MAX2643)
JU1 C3 OPEN
RFOUT SWA
1 R1 511
BIAS
RFOUT
6 C5 100pF
U1 2 GND
MAX2642 MAX2643
GND
5
GND
RFIN SWA
C1 470pF
L1 8.7nH C2 3.3pF
3
RFIN
VCC 4 C6 47pF
R4 0 C7 4.7F
VCC
Figure 1. MAX2642/MAX2643 EV Kit Schematic
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MAX2642/MAX2643 Evaluation Kits Evaluate: MAX2642/MAX2643
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Figure 2. MAX2642/MAX2643 EV Kits Component Placement Guide--Component Side
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Figure 3. MAX2642/MAX2643 EV Kits PC Board Layout-- Component Side
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Figure 4. MAX2642/MAX2643 EV Kits PC Board Layout-- Ground Plane Layers 2 and 3
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Figure 5. MAX2642/MAX2643 EV Kits PC Board Layout-- Solder Side
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.
4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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