19-1463; Rev 2; 10/00
MAX2235 Evaluation Kit
General Description
The MAX2235 evaluation kit (EV kit) simplifies evalua-
tion 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 con-
nection 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
-40°C to +85°C
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
0.068µF, 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
0.01µF, 10% ceramic capacitor (0805)
Murata GRM40X7R103K050V
1µF, +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)
0Ω 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 advan-
tage of displaying gain versus a swept-frequency
band, in addition to displaying input and output
return loss. Refer to the Network Analyzer manufac-
turer’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 fre-
quency (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 cur-
rent
Two 50Ω SMA cables
One SMA 20dB pad
Network Analyzer (HP8753D, for example) to mea-
sure 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 V
CC
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 sup-
ply layout, in which each V
CC
node on the circuit has a
separate connection to a central V
CC
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 V
CC
and GND terminals
on the EV kit.
Do not turn on the supply.
2
_______________________________________________________________________________________
微控制器 MCU
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
