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19-1463; Rev 2; 10/00
MAX2235 Evaluation Kit
General Description
The MAX2235 evaluation kit (EV kit) simplifies evaluation of the MAX2235 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. 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. o Easy Evaluation of MAX2235 o +2.7V to +5.5V Single-Supply Operation o RF Input and Output Matched for Operation from 824MHz to 849MHz o All Critical Peripheral Components Included
Features
Evaluates: MAX2235
Component Suppliers
SUPPLIER ATC Kamaya Murata Electronics Toko PHONE 516-622-4700 219-489-1533 800-831-9172 408-432-8281 FAX 516-622-4748 219-489-2261 814-238-0490 408-943-9790 PART MAX2235EVKIT
Ordering Information
TEMP. RANGE -40C to +85C IC PACKAGE 20 TSSOP-EP
Component List
DESIGNATION QTY C1 C2 1 1 DESCRIPTION 100pF, 5% ceramic capacitor (0603) Murata GRM39COG101J050V 68pF, 5% ceramic capacitor (0603) Murata GRM39COG680J050V 1000pF, 10% ceramic capacitors (0603) Murata GRM39X7R102K050V 100pF, 5% ceramic capacitors (0402) Murata GRM36COG101J050V 22pF, 5% ceramic capacitor (0603) Murata GRM39COG220J050V 0.068F, 10% Murata GRM39X7R683K016V 470pF, 10% ceramic capacitors (0603) Murata GRM39X7R471K050V 220pF, 5% ceramic capacitor (0603) Murata GRM39COG221J050V 1500pF, 10% ceramic capacitor (0603) Murata GRM39X7R152K0504 47pF, 5% ceramic capacitor ATC 100A470JW150X DESIGNATION QTY C14 C15 1 1 DESCRIPTION 11pF, 5% ceramic capacitor ATC 100A110JW150X 0.01F, 10% ceramic capacitor (0805) Murata GRM40X7R103K050V 1F, +80%, -20% ceramic capacitor (1206) Murata GRM42-6Y5V105Z025V 1000pF, 10% ceramic capacitors (0805) Murata GRM40X7R102K050V 8.2nH (0603) inductor Toko LL1608-FH8N2K 30-gauge wire short SMA connectors (PC edge mount) E.F. Johnson 142-0701-801 Test points 3-pin header (0.1" centers) 0 resistor (0603) Kamaya RMC16-000T 1-pin header MAX2235EUP (TSSOP-20) MAX2235 EV kit PC board 1
C3, C4
2
C16
1
C5, C6 C7 C8 C9, C10 C11 C12 C13
2 1 1 2 1 1 1
C17, C18
2
L1 L3 J1, J2 J3, J4 JU1 R1 VCTRL U1 None
1 1 2 2 1 1 1 1 1
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX2235 Evaluation Kit Evaluates: MAX2235
Quick Start
The MAX2235 EV kit is fully assembled and factory tested. Follow the instructions in the Connections and Setup section for proper device evaluation. 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 836MHz at a power level of 0dBm. 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 836MHz. 6) Turn on the DC supply. The supply current should read approximately 70mA. 7) Activate the RF generator's output. The power meter should read approximately +30dBm. The supply-current should increase to approximately 600mA. 8) 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 and output return loss. Refer to the Network Analyzer manufacturer's user manual for setup details.
Test Equipment Required
This section lists the recommended test equipment to verify operation of the MAX2235. 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 (HP8648C, or equivalent) One RF power sensor capable of handling at least +20dBm of output power at the operating frequency (HP8482A, or equivalent) One 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 that covers the operating frequency range of the MAX2235 as well as a few harmonics (HP8561E, for example) A power supply capable of up to 1A at +2.7V to +5.5V An optional ammeter for measuring the supply current Two 50 SMA cables One SMA 20dB pad Network Analyzer (HP8753D, for example) to measure small-signal return loss and gain (optional)
*
*
*
* * * * *
Layout Issues
A good PC board (PCB) is an essential part of an RF circuit design. The EV kit PCB can serve as a guide for laying out a board using the MAX2235. Keep traces carrying RF signals as short as possible to minimize radiation and insertion loss due to the PCB. Each VCC node on the PCB 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.
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 +3.6V (through an ammeter if desired) to the VCC and GND terminals on the EV kit. Do not turn on the supply.
2
_______________________________________________________________________________________
MAX2235 Evaluation Kit Evaluates: MAX2235
J1 SMA
C1 100pF
L1 8.2nH
1 2 3 4 5
RFIN GND VCC VCC VCC GND GND VCC VCC GND
VCTAL SHDN GND GND
20 19 18 17 16
C10 470pF
C17 1000pF 3 2
JU2 VCC
JU1
VCC C3 1000pF
C9 470pF R1 0
C18 1000pF
1
VCC
MAX2235
OUT OUT GND GND VREF RAMP
SHORT 15 14 13 12 11 C8 0.068F J3 C15 0.01F C14 11pF C13 47pF
C5 C6 C7 100pF 100pF 22pF
6 7 8
C12 1500pF
C2 68pF J2 SMA
VCC
9 C11 220pF C4 1000pF 10
J4
C16 1F
Figure 1. MAX2235 EV Kit Schematic
1.0"
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Figure 2. MAX2235 EV Kit Component Placement Guide-- Component Side
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1.0"
Figure 3. MAX2235 EV Kit PC Board Layout--Component Side
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3
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VCC
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MAX2235 Evaluation Kit Evaluates: MAX2235
1.0" 1.0"
Figure 4. MAX2235 EV Kit PC Board Layout--Ground Plane
Figure 5. MAX2235 EV Kit PC Board Layout--Power Plane
1.0"
Figure 6. MAX2235 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.
4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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