MAX2242EVKIT

19-1912; Rev 0; 1/01 MAX2242 Evaluation Kit Features ♦ Easy Evaluation of MAX2242 ♦ +2.7V to +3.6V True Single-Supply Operation ♦ Output Matched for 2.4GHz to 2.5GHz Operation ♦ All Matching Components Included Ordering Information PART TEMP. RANGE IC-PACKAGE MAX2242EVKIT -40°C to +85°C 3×4 UCSP MAX2242 EV Kit Component List DESIGNATION C1, C9 C2 C3, C6, C8, C10 DESCRIPTION DESIGNATION QTY 2 8.06kΩ ±1% resistors (0402) 2 33pF 5% 50V ceramic capacitors (0402), Murata GRM36C0G330J050AD or Taiyo Yuden UMK105CH330JW R1, R2 R3 1 47kΩ ±5% resistor (0402) R4 1 51Ω ±5% resistor (0402) IN, OUT 2 1 1.8pF ±0.1pF 50V ceramic capacitor (0402), Murata GRM36C0G1R8B050AD or Taiyo Yuden EVK105CH1R8JW SMA connectors (PC edgemount) EFJohnson 142-0701-801 or Digi-Key J502-ND JU1 1 4 0.1µF 10% 10V ceramic capacitors (0402) Murata GRM36X5R104K010 or Taiyo Yuden LMK105BJ104MV 3-pin header Digi-Key S1012-36-ND or equivalent BIAS, PDOUT 2 1-pin headers Digi-Key S1012-36-ND or equivalent None 1 Shunt for JU1 Digi-Key S9000-ND or equivalent VCC, GND 2 Test points Mouser 151-203 U1 1 MAX2242EBC (3×4 UCSP) None 1 MAX2242 PC board None 1 MAX2242 data sheet None 1 MAX2242 EV kit data sheet QTY C4, C7 2 Not installed C5 1 22µF 16V tantalum capacitor (Case B) AVX TAJB226M016 1 6.0pF ±0.1pF 50V ceramic capacitor (0402), Murata GRM36C0G060B050AD or Taiyo Yuden EVK105CH060JW C12 L1 1 10nH ±0.3nH 5% inductor (0402) Coilcraft 0402CS-10NXJBG L2 1 2.2nH inductor (0402) Murata LQP10A2N2B00 DESCRIPTION ________________________________________________________________ Maxim Integrated Products 1 For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Evaluates: MAX2242 General Description The MAX2242 evaluation kit (EV kit) simplifies evaluation of the MAX2242 power amplifier (PA), which is designed for 2.4GHz ISM-band direct-sequence spread-spectrum (DSSS) applications. The kit enables testing of the device’s RF performance and requires no additional support circuitry. The EV kit input and output use SMA connectors to facilitate the connection to RF test equipment. Each kit is assembled with the MAX2242 and incorporates input- and output-matching components optimized for the 2.4GHz to 2.5GHz RF frequency band. Evaluates: MAX2242 MAX2242 Evaluation Kit Component Suppliers SUPPLIER PHONE FAX AVX 803-946-0690 803-626-3123 Coilcraft 847-639-6400 847-639-1469 EF Johnson 402-474-4800 402-474-4858 Murata 800-831-9172 814-238-0490 Taiyo Yuden 800-348-2496 408-434-0375 _________________________Quick Start The MAX2242 EV kit is fully assembled and factory tested. Follow the instructions in the Connections and Setup section for proper device evaluation. Test Equipment Required This section lists the test equipment recommended to verify operation of the MAX2242. It is intended as a guide only, and some substitutions are possible: • One RF signal generator capable of delivering at least +10dBm of output power at the operating frequency with 802.11b comparable source • One RF power sensor capable of handling at least +20dBm of output power at the operating frequency (HP 8482A, or equivalent) • One 20dB high-power attenuator • One RF power meter capable of measuring up to +20dBm of output power at the operating frequency (HP EPM-441A or equivalent) • One RF spectrum analyzer capable of measuring ACPR and covering the MAX2242’s operating frequency range (Rohde and Schwartz FSEA20, for example) • One power supply capable of delivering up to 0.5A at +2.7V to +3.6V • One high-impedance voltmeter for measuring the actual operating voltage • One ammeter for measuring the supply current (optional) • Two 50Ω SMA cables • One network analyzer (HP 8753D, for example) to measure small signal return loss and gain (optional) 2 Connections and Setup This section provides a step-by-step guide to operating the EV kit and testing the device’s functions. Do not turn on the DC power or RF signal generator until all connections are made: 1) Connect a 20dB high-power attenuator to the OUT SMA connector on the EV kit. This will prevent overloading the power sensor and the power meter. 2) Connect a DC supply set to +3.3V (through an ammeter if desired), and connect the voltmeter to the EV kit’s VCC and GND terminals. 3) Connect an RF signal generator to the IN SMA connector. Set the generator for a 2.45GHz output frequency at a -10dBm power level. 4) Connect the power sensor to the power meter. Calibrate the power sensor for 2.45GHz. Set the power meter offset to compensate the 20dB attenuator plus any cable loss (between 0.5dB and 2dB), and circuit board losses (approximately 0.15dB). 5) Connect a power sensor to the 20dB high-power attenuator. 6) Place the SHDN jumper (JU1) in the ON position. 7) Turn on the DC supply and adjust BIAS voltage to give idle current of 280mA. 8) Activate the RF generator’s output. Set the RF generator’s output to produce a reading of +22dBm on the power meter. Verify that the voltmeter reads +3.3V. Iteratively adjust the power supply’s output and the RF generator’s output to produce a +3.3V reading on the voltmeter and a reading of +22dBm on the power meter. • The supply current should increase to approximately 305mA. Layout Issues A good PC board 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 MAX2242. Keep traces carrying RF signals as short as possible to minimize radiation and insertion loss due to the PC board. Each VCC_ node on the PC board should have its own decoupling capacitor. This minimizes supply coupling from one section of the IC to another. Using a star topology for the supply layout, in which each VCC_ node on the circuit has a separate connection to a central VCC node, can further minimize coupling between sections of the IC. _______________________________________________________________________________________ _______________________________________________________________________________________ L2 2.2nH L = 22mils W = 22mils GROUND THROUGH HOLE VIA PLACEMENT: THE GROUND THROUGH HOLE VIAS ARE PLACED 3.5mils FROM THE EDGE OF THE GROUND VIA TO THE EDGE OF GND1 PIN, GND2 PIN AND GND3 PIN. BOARD MATERIAL = FR4 DIELECTRIC CONSTANT = 4.5 DIELECTRIC THICKNESS = 6mils METAL THICKNESS = 1.0oz COPPER LOSS TANGENT = 0.03 W = 10mils L = 274mils W = 15mils L = 250mils VCC L = 22mils W = 22mils R2 8.06kΩ C12 6pF L = 22mils W = 22mils 1 BIAS TESTPOINT L = 21mils W = 10mils R1 8.06kΩ 3 1 C3 C4 B4 C1 U1 VCC2 VCC2 GND3 GND3 A2 A1 GND1 BIAS PDOUT PD_OUT OUT RF_OUT VCC1 VCC1 B2 B1 A4 VCCB MAX2242 VCCB A3 GND2 GND2 RF_IN IN 2 C2 SHDN JU1 C1 33pF VCC L = 51mils W = 10mils L = 36mils W = 10mils L1 10nH W = 22mils L = 22mils R3 47kΩ L = 40mils W1 = 10mils W2 = 22mils W = 10mils L = 109mils W = 20mils L = 57mils C10 0.1µF VCC 1 PDOUT TESTPOINT W = 20mils L = 218mils C7 OPEN C9 33pF C8 0.1µF VCC R4 51Ω C6 0.1µF C4 OPEN C2 1.8pF C5 22µF W = 15mils L = 250mils GND VCC W = 10mils L = 21mils W = 22mils L = 22mils VCC C3 0.1µF W = 22mils W = 20mils W = 22mils L = 22mils L = 30mils L = 22mils W = 20mils L = 43mils VCC OUT SMA Evaluates: MAX2242 IN SMA MAX2242 Evaluation Kit Figure 1. MAX2242 EV Kit Schematic 3 Evaluates: MAX2242 MAX2242 Evaluation Kit 1.0" Figure 2. MAX2242 EV Kit Component Placement Guide— Component Side 1.0" Figure 3. MAX2242 EV Kit PC Board Layout—Component Side 4 1.0" Figure 4. MAX2242 EV Kit PC Board Layout—Ground Plane _______________________________________________________________________________________ MAX2242 Evaluation Kit 1.0" Figure 5. MAX2242 EV Kit PC Board Layout—Power Plane Figure 6. MAX2242 EV Kit 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. 5 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. Evaluates: MAX2242 1.0"