19-2579; Rev 0; 9/02
MAX2649 Evaluation Kit
General Description
The MAX2649 evaluation kit (EV kit) simplifies evalua-
tion of the MAX2649. The EV kit allows the evaluation of
the LNA without requiring additional support circuitry.
The signal input and output use SMA connectors to
simplify the connection of RF test equipment.
The MAX2649 EV kit is assembled with an associated
IC and incorporates input and output matching compo-
nents optimized for RF frequencies from 5150MHz to
5350MHz. For operation outside this range, refer to the
MAX2649 data sheet.
Features
o
+2.7V to +3.6V Single-Supply Operation
o
50Ω SMA Inputs and Outputs on RF Ports for
Easy Testing
o
All Matching Components Included
o
Fully Assembled and Tested
Evaluates: MAX2649
Component List
DESIGNATION
C1, C4, C6
C2
C3
C5
C7
C8
C9
C10
L1, L2
L3
R2
R3
QTY
3
1
1
1
1
1
1
1
2
1
1
1
DESCRIPTION
3.9pF ceramic capacitors (0402)
Murata GJ61555C1H3R9B
0.75pF ceramic capacitor (0402)
Murata GJ61555C1HR75B
22pF ceramic capacitor (0402)
Murata GRP1555C1H220J
20pF ceramic capacitor (0402)
Murata GRP1555C1H200J
1pF ceramic capacitor (0402)
Murata GRP1555C1H1R0B
100pF ceramic capacitor (0402)
Murata GRP1555C1H101J
0.01µF ceramic capacitor (0402)
Murata GRP1555R71C103K
8.2pF ceramic capacitor (0402)
Murata GRP1555C1H8R2B
1.2nH inductors (0402)
Toko LL1005-FH1N2S
22nH inductor (0402)
Toko LL1005-FH22NJ
100Ω
±1%
resistor
200Ω
±5%
resistor
PART
MAX2649EVKIT
Ordering Information
TEMP RANGE
-40°C to +85°C
IC PACKAGE
2
×
3 UCSP
TM
Quick Start
The MAX2649 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 the
MAX2649 operation. It is intended as a guide only, and
some substitutions are possible.
Table 1. Test Equipment
EQUIPMENT
RF Signal
Generators
RF Spectrum
Analyzer
Power Supply
Power Meter
Ammeter
Network
Analyzer
DESCRIPTION
Capable of delivering 0dBm of output
power up to 6GHz (HP 8648C or equivalent)
Capable of covering the operating
frequencies of the device as well as a few
harmonics (HP 8561E or equivalent)
Capable of 30mA at +2.7V to +3.6V
Capable of measuring 20dBm
To measure supply current (optional)
To measure small-signal return loss and
gain (optional, HP 8753D or equivalent)
Component Suppliers
SUPPLIER
Murata
Toko
PHONE
800-831-9172
408-432-8281
FAX
814-238-0490
408-943-9790
Connections and Setup
This section provides a step-by-step guide to operate
and test the device’s functions. Do not turn on DC
power or RF signal generators until all connections are
made.
Testing the Supply Current
1) Connect a DC supply set to +3.0V (through an
ammeter if desired) to the VCC (J3) and GND (J4)
terminals on the EV kit. If available, set the current
limit to 30mA. Do not turn on the supply.
1
UCSP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________
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.
MAX2649 Evaluation Kit
Evaluates: MAX2649
2) Connect VCC to the shutdown test port (TP1).
3) Turn on the DC supply; the supply current should
read approximately 14mA.
4) To test the shutdown current, repeat Steps 1, 2, and
3 with shutdown connected to GND.
Testing the Power Gain
1) Connect a DC supply set to +3.0V (through an
ammeter if desired) to the VCC and GND terminals
on the EV kit. If available, set the current limit to
30mA. Do not turn on the supply.
2) Gain can be determined with a network analyzer.
This has the advantage of displaying gain over 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.
3) (Optional) Connect one RF signal generator to the
RFIN SMA connector. Do not turn on the generator’s
output. Set the generator to an output frequency of
5250MHz, and set the generator power level to
-30dBm.
4) (Optional) Connect the spectrum analyzer to the
RFOUT SMA connector. Set the spectrum analyzer
to a center frequency of 5250MHz and a total span
of 20MHz.
5) (Optional) Turn on the DC supply, and then activate
the RF generator’s output. A 5250MHz signal shown
on the spectrum analyzer display should indicate a
magnitude of approximately -15dBm. Account for
cable losses (between 0.5dB and 2dB) and circuit
board losses (approximately 0.5dB) when comput-
ing gain.
J3
VCC
C9
0.01µF
C8
100pF
C5
20pF
C6
3.9pF
C7
1pF
L3
22nH
C10
8.2pF
Testing the Noise Figure
Noise-figure measurements on low-noise devices such as
the MAX2649 are extremely sensitive to lab setup, board
losses, and parasitics. There are many techniques and
precautions for measuring a low noise-figure device.
Detailed explanation of these items goes beyond the
scope of this document. For more information on how to
perform this level of noise-figure measurement, refer to
Agilent Technologies Application Note 57-2,
Noise Figure
Measurement Accuracy.
Layout
The EV kit’s PC board can serve as a guide for laying
out a board using the MAX2649.
Design the layout as compact as possible to minimize
board parasitics. Install capacitors as close as possible
to the IC supply-voltage pin. Place the ground end of
these capacitors near the IC GND pins to provide a
low-impedance return path for the signal current.
Connect multiple vias from the ground plane as close
as possible to the ground pins. When using a UCSP
package, round or square pads are permissible.
For the power supplies, a star topology works well to
isolate different sections of the device. Each VCC node
has its own path to a central VCC. Place decoupling
capacitors that provide low impedance at the RF
frequency of interest close to all VCC connections. The
central VCC should have a large decoupling capacitor
as well.
For the best gain and noise performance, use high-Q
(40) components for the LNA input-matching circuit.
J4
J1
C1
3.9pF
RFIN
50Ω
TRANSMISSION
LINE
RFIN
C2
0.75pF
U1
V
CC
GND
R3
200Ω
L2
1.2nH
L1
1.2nH
C4
3.9pF
RFOUT
GND
MAX2649
TP1
SHUTDOWN
R2
100Ω
J2
SHDN
C3
22pF
RFOUT
Figure 1. MAX2649 EV Kit Schematic
2
_______________________________________________________________________________________
MAX2649 Evaluation Kit
Evaluates: MAX2649
Figure 2. MAX2649 EV Kit Component Placement Guide—Component Side
_______________________________________________________________________________________
3
MAX2649 Evaluation Kit
Evaluates: MAX2649
1.0"
Figure 3. MAX2649 EV Kit PC Board Layout—Inner Layer 2
1.0"
Figure 4. MAX2649 EV Kit PC Board Layout—Inner Layer 3
1.0"
Figure 5. MAX2649 EV Kit PC Board Layout—Component Side
1.0"
Figure 6. MAX2649 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
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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