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19-1773; Rev 1; 11/00
MAX2251 Evaluation Kit
General Description
The MAX2251 evaluation kit (EV kit) simplifies evaluation of the MAX2251 power amplifier (PA), which is designed for operation in IS-136-based TDMA and AMPS. The kit enables testing of the device's RF performance and requires no additional support circuitry. The EV kit's signal input and output use SMA connectors to facilitate the connection of RF test equipment. Each kit is assembled with the MAX2251 and incorporates input and output matching components optimized for the 824MHz to 849MHz RF frequency band. The EV kit is capable of operating at RF frequencies from 750MHz to 1000MHz with the appropriate matching components. o Easy Evaluation of MAX2251 o +2.8V to +4.5V Single-Supply Operation o RF Input/Output Matched for 824MHz to 849MHz Operation o Fully Assembled and Tested
Features
Evaluates: MAX2251
Ordering Information
PART MAX2251EVKIT TEMP. RANGE -40C to +85C IC PACKAGE 44 UCSP
MAX2251 EV Kit Component List
DESIGNATION QTY DESCRIPTION 4.7F 20%, 10V tantalum cap AVX TAJ A 475 M010 (10V A case) AVX TAJ A 475 M020 (20V A case) (A or B case PC board pads) 9pF 0.5pF ceramic cap (0402) Murata GRM36COG090D050 or Taiyo Yuden UMK105CH090DW 0.01F 10% ceramic caps (0402) Murata GRM36X7R103K016 or Taiyo Yuden EMK105BJ103KV 100pF 5% ceramic caps (0402) Murata GRM36COG101J050 or Taiyo Yuden UMK105CH101JW 4700pF 10% ceramic cap (0402) Murata GRM36X7R472K025 or Taiyo Yuden TMK105B472KW 10pF 1% porcelain capacitor ATC 100A100FW150X 220pF 10% ceramic cap Murata GRM36COG221K050 4.7pF 0.25pF ceramic cap (0402) Murata GRM36COG4R7C050 Taiyo Yuden EVK105CH4R7JW DESIGNATION C15 L1 L2 L3 R1, R2 R3 R4 B1 JU1, JU2 None RFIN, RFOUT VCC, GND, TP1 U1 QTY 1 1 1 1 2 1 1 1 2 2 2 3 1 DESCRIPTION Do not install 4.7nH 5% inductor (0402) Murata LQG10A4N7S00 7.15nH 5% air core inductor Coilcraft 1606-7 Do not install 10k 5% resistors (0402) 47.5k 1% resistor (0603) 11k 1% resistor (0603) Ferrite bead Murata BLM11P300SPT 3-pin headers Shunts (JU1, JU2) SMA connectors (PC edge mount) EFJohnson 142-0701-801 Digi-Key J502-ND Test points, Mouser 151-203 MAX2251E/B (16 CSP)
C1
1
C3
1
C4, C7, C10
3
C5, C6, C11
3
C9
1
C12 C13
1 1
C14
1
________________________________________________________________ Maxim Integrated Products
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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.
MAX2251 Evaluation Kit Evaluates: MAX2251
Component Suppliers
SUPPLIER ATC AVX Coilcraft EFJohnson Kamaya Murata Electronics NEC ROHM Taiyo Yuden PHONE 516-622-4700 803-946-0690 847-639-6400 402-474-4800 219-489-1533 800-831-9172 408-243-2111 408-433-2225 408-573-4150 FAX 516-622-4748 803-626-3123 847-639-1469 402-474-4858 219-489-2261 814-238-0490 408-243-2410 408-434-0531 408-573-4159 WEB www.atceramics.com www.avx-corp.com www.coilcraft.com www.efjohnson.com www.kamaya.com www.murata.com www.cel.com www.rohm.com www.t-yuden.com
_________________________Quick Start
The MAX2251 EV kit is fully assembled and factory tested. Follow the instructions in the Connections and Setup section for proper device evaluation.
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 RFOUT 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 RFIN signal generator to the RFIN SMA connector. Set the generator for an 836MHz output frequency at a 0dBm power level. 4) Connect the power sensor to the power meter. Calibrate the power sensor for 836MHz. Set the power meter offset to compensate the 20dB attenuator plus any cable loss (between 0.5dB and 2dB). 5) Connect a power sensor to the 20dB high-power attenuator. 6) Place the MODE jumper (JU1) in the VCC position and the SHDN jumper (JU2) in the VCC position. 7) Turn on the DC supply. The supply current should read approximately 210mA. 8) Activate the RF generator's output. Set the RF generator's output to produce a reading of +30dBm 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 +30dBm on the power meter. The supply current should increase to approximately 750mA.
Test Equipment Required
This section lists the test equipment recommended to verify operation of the MAX2251. It is intended as a guide only, and some substitutions are possible: * An RF signal generator capable of delivering at least +10dBm of output power at the operating frequency with TDMA modulation (HP E4433G or equivalent) * An RF power sensor capable of handling at least +20dBm of output power at the operating frequency (HP 8482A, or equivalent) * A 20dB high-power attenuator * An RF power meter capable of measuring up to +20dBm of output power at the operating frequency (HP EPM-441A or equivalent) * An RF spectrum analyzer capable of measuring ACPR in NADC modulation mode and covering the MAX2251's operating frequency range (Rohde and Schwarz FSEA20, for example) * A power supply capable of up to 1.5A at +2.8V to +4.5V * A high-impedance voltmeter for measuring the actual operating voltage * An ammeter for measuring the supply current (optional) * Two 50 SMA cables * A network analyzer (HP 8753D, for example) to measure small-signal return loss and gain (optional)
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MAX2251 Evaluation Kit
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 MAX2251. 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.
Evaluates: MAX2251
VCC A2 A3 R4 11k 1% VCC L2 7.15nH C11 100pF C12 10pF W = 85 L = 238 RFOUT SMA W = 85 L = 315 OUT B4 C14 4.7pF W = 12 L = 125 C13 220pF TPI TEST POINT C9 4700pF A4 A1 GND GND GND BIAS2 VCC D1 C6 100pF D2 W = 18 L = 150 L3 R2 10k R1 10k VCC JU1 C15 VCC JU2 L1 4.7nH C7 0.01F C3 9pF W = 18 L = 80 RFIN SMA
U1 MAX2251
IN
B3 OUT
SHDN D3 D4 C1 C4
C10 0.01F
MODE BIAS1 GND
R3 47.5k 1% W=3 L = 76 W = 35 L = 187 C5 100pF B1 FERRITE C4 0.01F VCC VCC C1 4.7F GND
B2 B1
VCC GND PD_OUT GND
C3
C2
Figure 1. MAX2251 EV Kit Schematic
_______________________________________________________________________________________
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MAX2251 Evaluation Kit Evaluates: MAX2251
1.0"
1.0"
Figure 2. MAX2251 EV Kit--Component Placement Guide
Figure 3. MAX2251 EV Kit PC Board Layout--Component Side
1.0"
Figure 4. MAX2251 EV Kit PC Board Layout--Ground Plane 4 _______________________________________________________________________________________
MAX2251Evaluation Kit Evaluates: MAX2251
1.0"
1.0"
Figure 5. MAX2251 EV Kit PC Board Layout--Solder Side
Figure 6. MAX2251 EV Kit PC Board Layout--Power Plane
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 _____________________ 5 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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