MAX2644EVKIT+

19-1786; Rev 0; 3/01 MAX2644 Evaluation Kit Features ♦ Easy Evaluation of MAX2644 ♦ +2.7V to +5.5V Single-Supply Operation ♦ Matched to 50Ω at 2450MHz ♦ Fully Assembled and Tested The MAX2644 EV kit is fully assembled with the MAX2644 and incorporates matching components optimized for a 2450MHz RF frequency operation. Ordering Information PART TEMP RANGE IC-PACKAGE MAX2644EVKIT -40°C to +85°C 8 SC70-6 Component Suppliers SUPPLIER Coilcraft PHONE FAX 847-639-6400 847-639-1469 WEBSITE www.coilcraft.com Kamaya 219-489-1533 219-489-2261 www.kamaya.com Murata Electronics 800-831-9172 814-238-0490 www.murata.com Taiyo Yuden 800-348-2496 408-434-0375 www.t-yuden.com Quick Start Component List DESIGNATION C1, C2 C3 QTY 2 1 DESCRIPTION 33pF ±5%, 50V ceramic capacitors (0402) Murata GRM36C0G330J050AD or Taiyo Yuden UMK105CH330JW The MAX2644 EV kit is fully assembled and factory tested. Follow the instructions in the Connections and Setup section for proper device evaluation. Test Equipment Required • 2.2pF ±0.1pF, 50V ceramic capacitor (0402) Murata GRM36C0G2R2B050AD or Taiyo Yuden UMK105CH2R2CW One RF signal generator capable of delivering 10dBm of output power and a frequency range covering the MAX2644 (2400MHz to 2500MHz, for example) • An RF spectrum analyzer that covers the operating frequency range (HP8561E, for example) • DC power supply capable of supplying +2.7V to +5.5V and 20mA of current L1 1 3.3nH ±0.3nH inductor (0402) Murata LQG10A3N3S00 or Coilcraft 0402CS-3N3XKBG • Two 50Ω coaxial cables with SMA connectors • (Optional) An ammeter to measure supply current R1 1 1.2kΩ ±5% resistor (0402) • (Optional) A noise figure meter • 2 SMA connectors (PC edge-mount) EFJohnson 142-0701-801 or Digi-Key J502-ND (Optional) Network analyzer to measure gain and return loss RFIN, RFOUT VCC, GND 2 Test points, Mouser 151-203 MAX2644EXT (6-pin SC70) U1 1 None 1 MAX2644EVKIT PC board None 1 MAX2644 EV kit data sheet None 1 MAX2644 data sheet 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 a 2450MHz output frequency at a -30dBm power level. Disable RF generates ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 Evaluates: MAX2644 General Description The MAX2644 evaluation kit (EV kit) simplifies the evaluation of the MAX2644 low-noise amplifier (LNA). The kit enables testing of the device’s performance and requires no additional support circuitry. The signal input and output use SMA connectors to facilitate easy connection of RF test equipment. Evaluates: MAX2644 MAX2644 Evaluation Kit RFOUT 1 BIAS R1 1.2kΩ C1 33pF SMA 6 SMA U1 2 RFIN RFOUT 3 GND MAX2644 RFIN L1 3.3nH GND VCC GND 5 4 VCC Length = 400mils C3 2.2pF C2 33pF Figure 1. MAX2644 EV Kit Schematic output. Connect the RF generator output to the RFIN SMA connector with a coaxial cable. 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 10mA (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. Typical board loss is 0.6dB from input to output port. 6) (Optional) Another method for determining gain is using a network analyzer. This has the advantage of displaying gain versus a swept frequency band, in addition to displaying input and output return loss. Refer to the network analyzer manufacturer’s user manual for setup details. Checking Noise Figure Noise figure measurements on low-noise devices such as the MAX2644 are extremely sensitive to board and lab setup losses and parasitics. There are many tech- 2 niques and precautions for measuring a low noise figure. Detailed explanation of these items would exceed the scope of this document. Take into account PCboard and external-components loss when performing noise-figure measurements. The typical input losses on this EV kit are 0.3dB. For more information on how to perform this level of noise-figure measurement, refer to the noise-figure meter operating manual as well as the Agilent Technologies (formerly Hewlett Packard) application note #57-2, “Noise Figure Measurement Accuracy.” Layout Considerations A good PC board layout is an essential part of an RF circuit design. The EV kit PC board can serve as a guide for laying out a board using the MAX2644. 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 or through vias or both. _______________________________________________________________________________________ MAX2644 Evaluation Kit 1.0" Figure 2. MAX2644 EV Kit Component Placement Guide— Component Side Figure 3. MAX2644 EV Kit PC Board Layout—Component Side 1.0" 1.0" Figure 4. MAX2644 EV Kit PC Board Layout—Solder Side Figure 5. MAX2644 EV Kit PC Board Layout—Ground Plane Layers 2 and 3 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ © 2001 Maxim Integrated Products Printed USA 3 is a registered trademark of Maxim Integrated Products. Evaluates: MAX2644 1.0"