MAX2240EVKIT

19-1624; Rev 0; 3/00 MAX2240 Evaluation Kit The MAX2240 EV kit is assembled with a MAX2240 and incorporates output matching components optimized for 2.4GHz to 2.5GHz. Features ♦ Easy Evaluation of the MAX2240 ♦ +2.7V to +5V Single-Supply Operation ♦ RF Output Matched for Operation from 2.4GHz to 2.5GHz ♦ Jumpers for Digital Power Control and Shutdown ♦ All Critical Peripheral Components Included Component Suppliers SUPPLIER Ordering Information PHONE FAX PART TEMP. RANGE IC PACKAGE Digi-Key 218-681-6674 218-681-3380 MAX2240EVKIT -40°C to +85°C 9 UCSP 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 C1, C2, C3 3 470pF ±10% ceramic caps (0402) Murata GRM36X7R471K050A C4, C9 2 220pF ±10% ceramic caps (0402) Murata GRM36X7R221K050A J4, J5 2 SMA connectors (PC edge mount) EFJohnson 142-0701-801 C6 1 18pF ±5% ceramic cap (0402) Murata GRM36COG180J050A J6, J7 2 C5, C7, C10 3 1000pF ±10% 25V min ceramic caps (0402) Murata GRM36X7R102K050A Connectors Digi-Key 500K-ND L1 1 22nH inductor Toko LL1608FS-22NK 1 8pF ±2.5pF 25V min ceramic cap (0402) Murata GRM36COG080D050A R1, R2, R3 3 1 1µF ±10% 10V min ceramic cap (0805) Murata GRM40X7R105010A 8.2Ω ±5% resistors (0402) Kamaya RMC 16S-18R2JT U1 1 1 0.01µF ±10% 10V min ceramic cap (0402) Murata GRM36X7R103K016A MAX2240EBL 9-pin ultra-chipscale package (UCSP) VCC, GND 2 Test points None 1 MAX2240 EV kit PC board, Rev B None 1 MAX2240 data sheet C8 C11 C12 J1, J2, J3 3 3-pin headers, 0.1in centers Digi-Key S1012-36-ND ________________________________________________________________ Maxim Integrated Products 1 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. Evaluates: MAX2240 General Description The MAX2240 evaluation kit (EV kit) simplifies evaluation of the MAX2240 power amplifier (PA). It enables testing of the device’s RF performance and requires no additional support circuitry. The EV kit’s signal inputs and outputs use SMA connectors to facilitate the connection of RF test equipment. Evaluates: MAX2240 MAX2240 Evaluation Kit Quick Start The MAX2240 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 recommended test equipment to verify operation of the MAX2240. It is intended as a guide only, and some substitutions are possible: • One RF signal generator capable of delivering at least +5dBm of output power at the operating frequency (HP 8648D, or equivalent) • One RF power sensor capable of handling at least +20dBm of output power at the operating frequency (HP 8482A, or equivalent) • One RF power meter capable of measuring up to +20dBm of output power at the operating frequency (HP 438A, or equivalent) • An RF spectrum analyzer that covers the MAX2240 operating frequency range, as well as a few harmonics (HP 8562E, for example) • A power supply capable of up to 0.25A at +2.7V to +5V • An optional ammeter for measuring the supply current • Two 50Ω SMA cables • One SMA 20dB pad • A network analyzer (HP 8753D, for example) to measure small-signal return loss and gain (optional) Connections and Setup This section provides a step-by-step guide to operating the EV kit and testing the device’s function. Do not turn on the DC power or RF signal generators until all connections are made: 1) Connect a DC supply set to +3.2V (through an ammeter if desired) to the VCC and GND terminals on the EV kit. Do not turn on the supply. 2) Connect one RF signal generator to the RFIN SMA connector; do not turn on the generator’s output. Set the generator for an output frequency of 2.45GHz at a power level of +3dBm. 2 3) Connect a 20dB pad to the RFOUT SMA connector on the EV kit. This is to prevent overloading of the power sensor and the power meter. 4) Connect a power sensor to the 20dB pad. 5) Connect the power sensor to a power meter. Set the power meter offset to 20dB and frequency to 2.45GHz. 6) Connect jumpers J1, J2, and J3 to short D0 and D1 to VCC. This sets the MAX2240 to its highest power mode. The MAX2240 EV kit is shipped in this setting. 7) Turn on the DC supply. The supply current should read approximately 70mA. 8) Activate the RF generator’s output. The power meter should read approximately +20dBm. The supply current should increase to approximately 105mA. 9) Another method for determining gain is by using a network analyzer (optional). This has the advantage of displaying gain versus a swept-frequency band, in addition to displaying input return loss. Refer to the network analyzer manufacturer’s user manual for setup details. 10) The additional MAX2240 power modes are set by the jumper settings of J2 (D0) and J3 (D1). See Table 1 in the MAX2240 data sheet for these powerlevel settings. 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 MAX2240. 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. 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. See the Layout section of the MAX2240 data sheet for more information. _______________________________________________________________________________________ _______________________________________________________________________________________ J7 J6 + C11 1µF J3 VCC J2 VCC J1 VCC C12 0.01µF J4 SMA RFIN R1 8.2Ω VCC 50Ω C5 1000pF C3 A2 A1 GND2 C1 RFOUT B3 MAX2240 U1 VCC C2 GND1 RFIN D1 D0 SHDN BIAS A3 B1 75Ω, 0 = 26° (w = 3.6mil l = 210mil)* R2 8.2Ω L1 22nH C8 8pF 50Ω C9 220pF 65Ω, 0 = 41° (w = 5mil, l = 334mil)* C6 18pF *MATERIAL IS FR4, RELATIVE DIELECTRIC CONSTANT(Er) = 4.5, 6mil THICK, 0.5oz COPPER. C3 470pF C2 470pF C1 470pF B2 C4 220pF 1.2nH BOARD TRACE VCC J5 SMA OUT C7 1000pF C10 1000pF VCC R3 8.2Ω Evaluates: MAX2240 VCC MAX2240 Evaluation Kit Figure 1. MAX2240 EV Kit Schematic 3 Evaluates: MAX2240 MAX2240 Evaluation Kit 1.0" 1.0" Figure 2. MAX2240 EV Kit Component Placement Guide Figure 3. MAX2240 EV Kit PC Board Layout—Component Side 1.0" Figure 4. MAX2240 EV Kit PC Board Layout—Ground Plane 4 _______________________________________________________________________________________ MAX2240 Evaluation Kit Evaluates: MAX2240 1.0" 1.0" Figure 5. MAX2240 EV Kit PC Board Layout—Power Plane Figure 6. MAX2240 EV Kit PC Board Layout—Solder Side _______________________________________________________________________________________ 5 Evaluates: MAX2240 MAX2240 Evaluation Kit NOTES 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. 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.