19-2591; Rev 0; 9/02
MAX2247 Evaluation Kit
General Description
The MAX2247 evaluation kit (EV kit) simplifies evalua-
tion of the MAX2247 power amplifier (PA). The kit
enables testing of the device’s RF performance and
requires no additional support circuitry. The EV kit input
and output use SMA connectors to facilitate the con-
nection to RF test equipment.
Each kit is assembled with the MAX2247 and incorpo-
rates all matching components optimized for the
2.4GHz to 2.5GHz RF frequency band, and P
OUT
=
+24dBm. For lower power applications, see Table 2 for
appropriate matching components.
♦
Easy Evaluation of MAX2247
♦
+2.7V to +3.6V Single-Supply Operation
♦
Output Matched for 2.4GHz to 2.5GHz Operation
♦
Fully Assembled and Tested
Features
Evaluates: MAX2247
Ordering Information
PART
MAX2247EVKIT
TEMP RANGE
-40°C to +85°C
IC PACKAGE
3
✕
4 UCSP
Component List
DESIGNATION
C1, C8, C10,
C12, C32
C2, C6, C7, C9
C3
C4, C5
C11
C31
C33
L1
R1
R2
R8
QTY
5
4
1
2
1
—
1
1
1
1
1
DESCRIPTION
22pF ceramic capacitors (0402)
GRP1555C1H220J
10nF ceramic capacitors (0402)
GRP155R71C103K
2.7pF ceramic capacitor (0402)
GRP1555C1H2R7B
47pF ceramic capacitors (0402)
GRP1555C1H470J
4.7µF tantalum capacitor
JMK212BJ475MG-B
Open
0.75pF ceramic capacitor (0402)
GJ61555C1HR75B
3.9nH inductor (0402)
LL1005_FH3N95
3kΩ
±5%
resistor
7.5kΩ
±5%
resistor
51kΩ
±5%
resistor
Quick Start
The MAX2247 EV kit is fully assembled and factory test-
ed. Follow the instructions in the
Connections and
Setup
section for proper device evaluation.
Test Equipment Required
Table 1 lists the required test equipment to verify
MAX2247 operation. It is intended as a guide only, and
some substitutions are possible.
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 DC power or RF signal generators until all connec-
tions are made.
Testing the Supply Current
1) Connect a 20dB attenuator to the OUT SMA con-
nector on the EV kit. This prevents overloading of
the power sensor and power meter.
2) Connect a DC supply set to +3.3V (through an amme-
ter, if desired) and connect a voltmeter to the EV kit’s
VCC and GND terminals. Do not turn on the supply.
3) Connect an RF signal generator to the IN SMA con-
nector. Calibrate the generator to produce an
802.11b compatible -10dBm signal, at 2.45GHz
output frequency. Do not turn on the output.
4) Connect the power sensor to the power meter.
Calibrate the power sensor for 2.45GHz. Set the
power meter offset to compensate the 20dB attenua-
tor, the coupler, and any cable loss (from 0.5dB to
2dB), and circuit board losses (approximately 0.3dB).
Component Suppliers
SUPPLIER
EFJohnson
Kamaya
Murata
Taiyo Yuden
Toko
PHONE
402-474-4800
260-489-1533
800-831-9172
800-348-2496
800-715-8656
FAX
402-474-4858
260-489-2261
814-238-0490
408-434-0375
408-943-9790
________________________________________________________________
Maxim Integrated Products
1
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.
MAX2247 Evaluation Kit
Evaluates: MAX2247
Table 1. Test Equipment Required
EQUIPMENT
Power Supply
RF Signal Generator
RF Power Sensor
20dB High-Power
Attenuator
Power Meter
Coupler
RF Spectrum
Analyzer
Ammeter/Voltmeter
50Ω SMA Cables
Network Analyzer
(Optional)
QTY
1
1
1
1
1
1
1
2
2
1
DESCRIPTION
Capable of delivering up to 500mA at +2.7V to +3.6V
Capable of delivering +10dBm of output power up to 2.5GHz with 802.11b-compatible source
Capable of handling +20dBm of output power at the operating frequency (HP 8482A, or equivalent)
—
Capable of handling +20dBm of output power at the operating frequency (HP EPM-441A, or
equivalent)
Capable of operating at the desired frequency
Capable of measuring ACPR/ALT and covering the MAX2247’s operating frequency range
(Rohde and Schwarz FSEA20, or equivalent)
—
—
For measuring small-signal return loss and gain
5) Connect the power sensor to the coupler. Connect
one of the remaining terminals of the coupler to the
20dB high-power attenuator and another end to the
spectrum analyzer.
6) Place the
SHDN
jumper in the ON position.
7) Turn on the DC supply. The idle current should read
approximately 250mA.
8) Activate the RF generator output. Set the RF gener-
ator’s output to produce a reading of +23dBm on
the power meter. Adjust the supply voltage so that
the voltmeter reads +3.3V. Adjust the output of the
generator until the power meter reads +24dBm.
• The supply current should increase to approxi-
mately 315mA.
• The ACPR/ALT measurements should meet the
MAX2247 EC table specifications.
Layout
The EV kit’s PC board can serve as a guide for laying
out a board using the MAX2247.
Keep RF signal lines as short as possible to minimize
losses and radiation. Always use controlled impedance
lines on all high-frequency inputs and outputs, and use
low-inductance connections to ground on all GND pins.
Each V
CC
node on the PC board should have its own
decoupling capacitor. Using a star topology for the
supply 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 the sections of the
IC. (Refer to the MAX2247 data sheet.)
Table 2. EV Kit Modifications for P
OUT
=
+21dBm, +18dBm, and +15dBm Applications
P
OUT
(dBm)
+21
+18
+15
C3 LOCATION
7
6
6
R1 (I
BIAS
)
6.1kΩ (135mA)
12kΩ (75mA)
13kΩ (65mA)
Lower Power Applications
This evaluation kit can be easily modified for P
OUT
=
+21dBm, +18dBm, and +15dBm applications by
changing the position of C3 and the bias current and
removing C33. (See Table 2 and Applications Notes.)
2
_______________________________________________________________________________________
MAX2247 Evaluation Kit
Evaluates: MAX2247
VCC
VCC
C1
22pF
RFIN
VCC
V
CC
BIAS
C2
10nF
VCC
R8
51kΩ
SHDN
JU1
BIAS
R2
7.5kΩ
BIAS
GND1
R1
3kΩ
PDOUT
GND2
C32
22pF
RFOUT
JU3
U1
V
CC
1
C4
47pF
GND3
V
CC
2
J2
C5
47pF
C7
10nF
VCC
C6
10nF
VCC
C8
22pF
C11
4.7µF
J2
GND
VCC
J1
RFIN
C12
22pF
MAX2247
L1
3.9nH
C9
10nF
JU1
C10
22pF
C33
0.75pF
J4
RFOUT
PDOUT
C3
2.7pF
Figure 1. MAX2247 EV Kit Schematic
1.0"
Figure 2. MAX2247 EV Kit Component Placement Guide—
Primary-Side Silkscreen
1.0"
Figure 3. MAX2247 EV Kit Component Placement Guide—
Secondary-Side Silkscreen
_______________________________________________________________________________________
3
MAX2247 Evaluation Kit
Evaluates: MAX2247
1.0"
Figure 4. MAX2247 EV Kit PC Board Layout—Layer 2
1.0"
Figure 5. MAX2247 EV Kit PC Board Layout—Layer 3
1.0"
Figure 6. MAX2247 EV Kit PC Board Layout—Primary
Component Side
1.0"
Figure 7. MAX2247 EV Kit PC Board Layout—Secondary
Component 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
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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