Evaluates: MAX2235 19-1463 Rev 2 10/00 MAX2235 Evaluation Kit General Description Features The MAX2235 evaluation kit (EV kit) simplifies evalua- Easy Evaluation of MAX2235 tion of the MAX2235 power amplifier (PA). It enables +2.7V to +5.5V Single-Supply Operation testing of the devices RF performance and requires no additional support circuitry. The EV kits signal inputs RF Input and Output Matched for Operation from and outputs use SMA connectors to facilitate the con- 824MHz to 849MHz nection of RF test equipment. All Critical Peripheral Components Included The MAX2235 EV kit is assembled with a MAX2235 and incorporates input and output matching components optimized for the 824MHz to 849MHz RF frequency band. All matching components may be changed to work at RF frequencies from 800MHz to 1000MHz. Component Suppliers Ordering Information PART TEMP. RANGE IC PACKAGE SUPPLIER PHONE FAX MAX2235EVKIT -40C to +85C 20 TSSOP-EP ATC 516-622-4700 516-622-4748 Kamaya 219-489-1533 219-489-2261 Murata Electronics 800-831-9172 814-238-0490 Toko 408-432-8281 408-943-9790 Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 100pF, 5% ceramic capacitor (0603) 11pF, 5% ceramic capacitor C1 1 C14 1 Murata GRM39COG101J050V ATC 100A110JW150X 0.01F, 10% ceramic capacitor (0805) 68pF, 5% ceramic capacitor (0603) C15 1 C2 1 Murata GRM40X7R103K050V Murata GRM39COG680J050V 1F, +80%, -20% ceramic capacitor 1000pF, 10% ceramic capacitors C16 1 (1206) C3, C4 2 (0603) Murata GRM42-6Y5V105Z025V Murata GRM39X7R102K050V 1000pF, 10% ceramic capacitors 100pF, 5% ceramic capacitors (0402) C5, C6 2 C17, C18 2 (0805) Murata GRM36COG101J050V Murata GRM40X7R102K050V 22pF, 5% ceramic capacitor (0603) C7 1 8.2nH (0603) inductor Murata GRM39COG220J050V L1 1 Toko LL1608-FH8N2K 0.068F, 10% C8 1 L3 1 30-gauge wire short Murata GRM39X7R683K016V SMA connectors (PC edge mount) 470pF, 10% ceramic capacitors (0603) J1, J2 2 C9, C10 2 E.F. Johnson 142-0701-801 Murata GRM39X7R471K050V J3, J4 2 Test points 220pF, 5% ceramic capacitor (0603) C11 1 JU1 1 3-pin header (0.1 centers) Murata GRM39COG221J050V 0 resistor (0603) 1500pF, 10% ceramic capacitor (0603) R1 1 C12 1 Kamaya RMC16-000T Murata GRM39X7R152K0504 VCTRL 1 1-pin header 47pF, 5% ceramic capacitor C13 1 U1 1 MAX2235EUP (TSSOP-20) ATC 100A470JW150X None 1 MAX2235 EV kit PC board Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX2235 Evaluation Kit 2) Connect one RF signal generator to the RFIN SMA Quick Start connector do not turn on the generators output. The MAX2235 EV kit is fully assembled and factory Set the generator for an output frequency of tested. Follow the instructions in the Connections and 836MHz at a power level of 0dBm. Setup section for proper device evaluation. 3) Connect a 20dB pad to the RFOUT SMA connector Test Equipment Required on the EV kit. This is to prevent overloading of the This section lists the recommended test equipment to power sensor and the power meter. verify operation of the MAX2235. It is intended as a 4) Connect a power sensor to the 20dB pad. guide only, and some substitutions are possible. 5) Connect the power sensor to a power meter. Set the One RF signal generator capable of delivering at power meter offset to 20dB and frequency to least +10dBm of output power at the operating fre- 836MHz. quency (HP8648C, or equivalent) 6) Turn on the DC supply. The supply current should One RF power sensor capable of handling at least read approximately 70mA. +20dBm of output power at the operating frequency 7) Activate the RF generators output. The power (HP8482A, or equivalent) meter should read approximately +30dBm. The One RF power meter capable of measuring up to supply-current should increase to approximately +20dBm of output power at the operating frequency 600mA. (HP EPM-441A, or equivalent) 8) Another method for determining gain is by using a An RF spectrum analyzer that covers the operating Network Analyzer (optional). This has the advan- frequency range of the MAX2235 as well as a few tage of displaying gain versus a swept-frequency harmonics (HP8561E, for example) band, in addition to displaying input and output A power supply capable of up to 1A at +2.7V to return loss. Refer to the Network Analyzer manufac- +5.5V turers user manual for setup details. An optional ammeter for measuring the supply cur- Layout Issues rent A good PC board (PCB) is an essential part of an RF Two 50 SMA cables circuit design. The EV kit PCB can serve as a guide for One SMA 20dB pad laying out a board using the MAX2235. Keep traces carrying RF signals as short as possible to minimize Network Analyzer (HP8753D, for example) to mea- radiation and insertion loss due to the PCB. Each V CC sure small-signal return loss and gain (optional) node on the PCB should have its own decoupling Connections and Setup capacitor. This minimizes supply coupling from one This section provides a step-by-step guide to operating section of the IC to another. A star topology for the sup- the EV kit and testing the devices function. Do not turn ply layout, in which each V node on the circuit has a CC on the DC power or RF signal generators until all separate connection to a central V node, can further CC connections are made. minimize coupling between sections of the IC. 1) Connect a DC supply set to +3.6V (through an ammeter if desired) to the V and GND terminals CC on the EV kit. Do not turn on the supply. 2 Evaluates: MAX2235