Evaluates: MAX2248 MAX2248 Evaluation Kit General Description Features The MAX2248 evaluation kit (EV kit) simplifies evaluation Easy Evaluation of the MAX2248 of the MAX2248 power amplifier (PA). It enables testing +2.7V to +5V Single-Supply Operation of the devices RF performance and requires no additional RF Output Matched for Operation from 1880MHz to support circuitry. The EV kits signal inputs and outputs 1930MHz use SMA connectors to facilitate the connection of RF Jumpers for Digital Power Control and Shutdown test equipment. All Critical Peripheral Components Included The MAX2248 EV kit is assembled with a MAX2248 and incorporates output-matching components optimized for 1880Mhz to 1930MHz. Ordering Information appears at end of data sheet. EV Kit Photo 319-100030 Rev 1 7/17Evaluates: MAX2248 MAX2248 Evaluation Kit 2) Connect one RF signal generator to J1 (RFIN) SMA Quick Start Connector on the EV Kit do not turn on the generators The MAX2248 EV kit is fully assembled and factory tested. output. Follow the instructions in the Connections and Setup Set the generator for an output frequency of Section for proper device evaluation. 1900MHz at a power level of +3dBm. 3) Connect a 20dB pad to J2 (RFOUT) SMA Connector Required Equipment 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 MAX2248. It is intended as a guide 4) Connect a power sensor to the 20dB pad. only, and some substitutions are possible: 5) Connect the power sensor to a power meter. Set One RF signal generator capable of delivering at the power meter offset to 20dB and frequency to least +5dBm of output power at the operating fre- 1900MHz. quency (HP 8648D, or equivalent) 6) Connect jumpers J2, J3, and J4 to short D1, D0, and One RF power sensor capable of handling at least SHDN to VCC. This sets the MAX2248 to its highest +20dBm of output power at the operating frequency power mode. The MAX2248 EV kit is shipped in this (HP 8482A, or equivalent) setting. 7) Turn on the DC supply. One RF power meter capable of measuring up to 8) Activate the RF generators output. The power meter +20dBm of output power at the operating frequency should read approximately +20dBm. The supply (HP 438A, or equivalent) current should increase to approximately 105mA. An RF spectrum analyzer that covers the MAX2248 9) Another method for determining gain is by using a operating frequency range, as well as a few harmonics network analyzer (optional). This has the advantage (HP 8562E, for example) of displaying gain versus a swept-frequency band, in A power supply capable of up to 0.25A at +2.7V addition to displaying input return loss. Refer to the to +5V network analyzer manufacturers user manual for setup details. An optional ammeter for measuring the supply 10) The additional MAX2248 power modes are set by current the jumper settings of J2 (D1) and J3 (D0). See Two 50 SMA cables Table 1 belowin for these power level settings. One SMA 20dB pad Layout Considerations A network analyzer (HP 8753D, for example) to A good PC board is an essential part of an RF circuit measure small-signal return loss and gain (optional) design. The EV kit PC board can serve as a guide for laying Procedure out a board using the MAX2248. Keep traces carrying RF signals as short as possible to minimize radiation and This section provides a step-by-step guide to operating insertion loss due to the PC board. Each VCC node on the EV kit and testing the devices function. Do not turn on the PC board should have its own decoupling capacitor. the DC power or RF signal generators until all connections This minimizes supply coupling from one section of the IC are made: to another. A star topology for the supply layout, in which 1) Connect a DC supply set to +3.2V (through an ammeter each VCC node on the circuit has a separate connection if desired) to the VCC and GND terminals on the EV to a central VCC node, can further minimize coupling kit. Do not turn on the supply. between sections of the IC. See the Layout section of the MAX2248 data sheet for more information. Table 1. Control Inputs DIGITAL CONTROL INPUTS OUTPUT POWER AND SUPPLY CURRENT /SHDN D1 D0 POWER LEVE PIN (dBm) POUT (dBm) ICC (mA) 0 0 0 PA OFF +3 - <1A 1 0 0 P1 +3 +4 73 1 0 1 P2 +3 +12 76 1 1 0 P3 +3 +18 82 1 1 1 P4 +3 +20 105 Maxim Integrated 2 www.maximintegrated.com