Maxim MAX2235EVKIT Evaluation kit Datasheet

19-1463; Rev 2; 10/00
MAX2235 Evaluation Kit
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.
♦ Easy Evaluation of MAX2235
♦ +2.7V to +5.5V Single-Supply Operation
♦ RF Input and Output Matched for Operation from
824MHz to 849MHz
♦ All Critical Peripheral Components Included
Ordering Information
Component Suppliers
SUPPLIER
PHONE
FAX
ATC
516-622-4700
516-622-4748
Kamaya
219-489-1533
219-489-2261
Murata Electronics
800-831-9172
814-238-0490
Toko
408-432-8281
408-943-9790
PART
TEMP. RANGE
MAX2235EVKIT
-40°C to +85°C
IC PACKAGE
20 TSSOP-EP
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
C1
1
100pF, 5% ceramic capacitor (0603)
Murata GRM39COG101J050V
C14
1
11pF, 5% ceramic capacitor
ATC 100A110JW150X
C2
1
68pF, 5% ceramic capacitor (0603)
Murata GRM39COG680J050V
C15
1
0.01µF, 10% ceramic capacitor (0805)
Murata GRM40X7R103K050V
C3, C4
2
1000pF, 10% ceramic capacitors
(0603)
Murata GRM39X7R102K050V
C16
1
1µF, +80%, -20% ceramic capacitor
(1206)
Murata GRM42-6Y5V105Z025V
C5, C6
2
100pF, 5% ceramic capacitors (0402)
Murata GRM36COG101J050V
C17, C18
2
C7
1
22pF, 5% ceramic capacitor (0603)
Murata GRM39COG220J050V
1000pF, 10% ceramic capacitors
(0805)
Murata GRM40X7R102K050V
L1
1
8.2nH (0603) inductor
Toko LL1608-FH8N2K
L3
1
30-gauge wire short
J1, J2
2
SMA connectors (PC edge mount)
E.F. Johnson 142-0701-801
J3, J4
2
Test points
JU1
1
3-pin header (0.1" centers)
R1
1
0Ω resistor (0603)
Kamaya RMC16-000T
VCTRL
1
1-pin header
U1
1
MAX2235EUP (TSSOP-20)
None
1
MAX2235 EV kit PC board
C8
1
0.068µF, 10%
Murata GRM39X7R683K016V
C9, C10
2
470pF, 10% ceramic capacitors (0603)
Murata GRM39X7R471K050V
C11
1
220pF, 5% ceramic capacitor (0603)
Murata GRM39COG221J050V
C12
1
1500pF, 10% ceramic capacitor (0603)
Murata GRM39X7R152K0504
C13
1
47pF, 5% ceramic capacitor
ATC 100A470JW150X
________________________________________________________________ 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.
1
Evaluates: MAX2235
Features
General Description
Evaluates: MAX2235
MAX2235 Evaluation Kit
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.
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 50Ω SMA cables
•
One SMA 20dB pad
•
Network Analyzer (HP8753D, 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.
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.
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.
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
SMA
1
2
3
VCC
4
C3
1000pF
5
C5
C6
C7
100pF 100pF 22pF
6
7
8
VCC
9
C11
220pF
C4
1000pF
10
RFIN
VCTAL
GND
SHDN
VCC
GND
VCC
GND
20
C10
470pF
JU2
C17
1000pF
VCC
3
19
18
2
C9
470pF
C18
1000pF
JU1
1
R1
0Ω
17
VCC
VCC
MAX2235
OUT
GND
OUT
GND
GND
VCC
GND
VCC
VREF
GND
RAMP
16
SHORT
15
C13
47pF
C12
1500pF
C2
68pF
J2
14
SMA
C14
11pF
13
12
11
C8
0.068µF
VCC
J3
C15
0.01µF
C16
1µF
gi
J4
e
L1
8.2nH
st
C1
100pF
Evaluates: MAX2235
J1
1.0"
Pl
ea
se
re
Figure 1. MAX2235 EV Kit Schematic
Figure 2. MAX2235 EV Kit Component Placement Guide—
Component Side
1.0"
Figure 3. MAX2235 EV Kit PC Board Layout—Component Side
_______________________________________________________________________________________
3
ea
re
se P
g
i
l
s
e
te
re a
gi se
st r
er eg
!
is
te
1.0"
1.0"
Figure 4. MAX2235 EV Kit PC Board Layout—Ground Plane
Pl
Pl
ea
se
Evaluates: MAX2235
MAX2235 Evaluation Kit
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
© 2000 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
Similar pages