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MAX2406 Evaluation Kit
_______________General Description
The MAX2406 evaluation kit (EV kit) simplifies testing of
the MAX2406. This EV kit allows the evaluation of the
low-noise amplifier (LNA) as well as the receive down-
converter mixer.
____________________________Features
o
+2.7V to +5.5V Single-Supply Operation
o
50Ω SMA Inputs and Outputs on RF, IF, and LO
Ports
o
Allows Testing of Shutdown Mode
o
Fully Assembled and Tested
Evaluates: MAX2406
____________________Component List
DESIGNATION QTY
C1, C2
C3, C7,
C8, C13
C4, C5,
C11, C12
C6, C15
C9
C10, C14
IF, LNAIN, LO,
LNAOUT,
RXMXIN
JU1
L1, L2,
L6, L7
L3
L4
L5
R1
R2, R3
R4
U1
2
4
4
2
1
2
5
1
4
1
0
1
1
2
0
1
DESCRIPTION
47pF ceramic capacitors
220pF ceramic capacitors
1000pF ceramic capacitors
1pF ceramic capacitors
10µF tantalum capacitor
AVX TAJC106K016
0.1µF ceramic capacitors
______________Ordering Information
PART
MAX2406EVKIT
TEMP. RANGE
-40°C to +85°C
IC PACKAGE
20 QSOP
_________________________Quick Start
SMA connectors (PC edge mount)
3-pin header
27nH inductors
Coilcraft 1008CS-270XMBC
4:1 balun
Toko 617DB-1010 type B4F
Not installed
4.7nH inductor
Toko LL2012-F4N7S
1kΩ resistor
0Ω resistors
Not installed
MAX2406EEP (20 QSOP)
The MAX2406 is fully assembled and factory tested.
Follow these instructions for initial evaluation of the
MAX2406.
Test Equipment Required
This section lists the test equipment recommended for
verifying operation of the MAX2406. It is intended as a
guide only; some substitutions may be possible.
•
Two RF signal generators capable of delivering at
least 0dBm of output power at frequencies up to
2GHz (HP8648C or equivalent). One generator is
required for the local oscillator (LO) source; the
other is required for the mixer input. Only one gener-
ator is required to operate the LNA.
•
An RF spectrum analyzer that covers the MAX2406’s
operating frequency range (HP8561E, for example).
•
A power supply that can provide up to 100mA at
2.7V to 5.5V.
•
An ammeter for measuring the supply current
(optional).
•
Several 50Ω SMA cables.
______________Component Suppliers
SUPPLIER
Coilcraft
AVX
PHONE/
FAX
(847) 639-6400/
(847) 639-1469
(803) 946-0690/
(803) 626-3123
INTERNET
http://www.coilcraft.com
http://www.avxcorp.com
Connections and Setup
This section provides a step-by-step guide to getting
the EV kit operational and testing both the LNA and the
receive mixer.
Do not turn on the DC power or RF
signal generators until all connections have been
made.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
MAX2406 Evaluation Kit
1)
2)
3)
4)
5)
6)
7)
Low-Noise Amplifier
Set the RXEN jumper (JU1) on the EV kit to the
“logic 1” position. This enables the MAX2406.
Connect a DC supply set to 3V (through an amme-
ter, if desired) to the VCC and GND terminals on the
EV kit. Do not turn on the supply.
Connect one RF signal generator to the LNAIN SMA
connector. Do not turn on the generator’s output.
Set the generator for an output frequency of 1.9GHz
and a power level of -40dBm.
Connect a spectrum analyzer to the LNAOUT SMA
connector on the EV kit. Set the spectrum analyzer
to a center frequency of 1.9GHz, a total span of
200MHz, and a reference level of 0dBm.
Turn on the DC supply; the supply current should
read approximately 20mA (if using an ammeter).
Activate the RF generator’s output. A 1.9GHz signal
shown on the spectrum analyzer’s display should
indicate a typical gain of 16dB after accounting for
cable losses.
If desired, the shutdown feature can be tested by
moving the RXEN jumper (JU1) into the “logic 0”
position. This disables the part and reduces the
supply current to typically 0.1µA.
Evaluates: MAX2406
_______________Detailed Description
This section describes the MAX2406 EV kit circuitry.
For more detailed information about the operation of the
device itself, please consult the MAX2406 data sheet.
Low-Noise Amplifier
The LNA circuitry consists of two DC-blocking capacitors:
one at the input (C13) and one at the output (C8). A shunt
capacitor (C15) provides a simple matching network to
improve the input return loss.
Local Oscillator
The MAX2406 EV kit’s LO input requires only a DC block-
ing capacitor (C3). No other circuitry is needed. For more
information on the LO port, including the optional use of a
differential LO source, consult the MAX2406 data sheet.
Mixer Input
The receiver mixer’s input (RXMXIN) requires a simple
matching network. Capacitor C6 and inductor L5 are
used to match the input pin to 50Ω, while C7 provides
DC blocking.
IF Output
The MAX2406 has a differential IF output port (IF and
IF)
that can be used either in a differential or single-ended
configuration. The EV kit uses a differential configuration.
The balun (L3) converts the MAX2406’s differential output
signal into a single-ended signal compatible with 50Ω test
equipment. The balun is not required in a typical applica-
tion. Inductors L1, L2, L6, and L7 provide DC bias and an
impedance-matching network. Please note that the match-
ing network is frequency selective and must be changed
for operation at other IF frequencies. Consult the MAX2406
data sheet for a plot of IF output impedance versus fre-
quency. Capacitors C4 and C5 provide DC blocking. The
balun (L3) provides the differential to single-ended conver-
sion with about 1dB of loss at 400MHz. The IF output sig-
nal is then connected to the IF SMA connector. Resistors
R2 and R3 (0Ω) and inductor L4 (not installed) are provid-
ed as pads on the EV kit’s PC board layout for experimen-
tation, if desired.
Receive Downconverter Mixer
1) Remove the RF signal generator and spectrum ana-
lyzer from the LNAIN and LNAOUT connections, if
necessary. The DC supply connections needed for
testing the downconverter mixer are the same as in
the LNA section.
2) Connect one RF signal generator (with the output
disabled) to the LO SMA connector. Set the fre-
quency to 1.5GHz and the output power to -10dBm.
This is the LO signal.
3) Connect the other RF signal generator (with the out-
put disabled) to the RXMXIN SMA connector. Set
the frequency to 1.9GHz and the amplitude to
-30dBm.
4) Connect the spectrum analyzer to the IF SMA con-
nector. Set the spectrum analyzer to a 400MHz cen-
ter frequency, a 200MHz total span, and a 0dBm
reference level.
5) Turn on the LO signal generator and the RF signal
generator.
6) The downconverted output signal at 400MHz is visi-
ble on the spectrum analyzer, indicating a mixer
conversion gain of 8.4dB after accounting for cable
and balun losses. The balun loss is typically 1dB at
400MHz.
2
______________________________Layout
A good PC board layout is an essential part of an RF
circuit design. The EV kit’s PC board can serve as a
guide for laying out a board using the MAX2406.
Each V
CC
node on the PC board has its own decou-
pling capacitor. This minimizes supply coupling from
one section of the MAX2406 to another. A star topology
for the supply layout, in which each V
CC
node on the
MAX2406 circuit has a separate connection to a central
V
CC
node, can further minimize coupling between the
LNA and mixer sections of the MAX2406.
_______________________________________________________________________________________
RXMXIN
SMA
C6
1pF
16
RXMXIN
GND
19
LNAOUT
SMA
VCC
C8
220pF
J4
GND
20
1
C13
220pF
2
LNAIN
GND
GND
LNAOUT
C15
1pF
3
4
Figure 1. MAX2406 EV Kit Schematic
J3
C7
220pF
L5
4.7nH
J7
LNAIN
SMA
MAX2406
C12
1000pF
L7
27nH
L2
27nH
VCC
5
V
CC
14
R1
1kΩ
6
RXEN
IF
VCC
C3
220pF
7
LO
LO
IF
C5
1000pF
VCC
9
V
CC
GND GND GND GND GND GND
10
VCC
C9
10µF
C10
0.1µF
11
12
15
17
18
C2
47pF
13
L1
27nH
8
R4
(OPEN)
C14
0.1µF
C4
1000pF
C11
1000pF 4
L6
27nH
C1
47pF
VCC
LOGIC 1
JU1
RXEN
LOGIC 0
R2
0Ω
L3
1
R3
0Ω
J2
IF
SMA
L4
(OPEN)
BALUN
WITH
4:1
IMPEDANCE
RATIO
LO
SMA
J1
J5
VCC
J6
Evaluates: MAX2406
_______________________________________________________________________________________
GND
MAX2406 Evaluation Kit
3
MAX2406 Evaluation Kit
Evaluates: MAX2406
1.0"
1.0"
Figure 2. MAX2406 EV Kit Layout—Top Silk Screen and Pad
Placement
Figure 3. MAX2406 EV Kit Layout—Component Side
1.0"
1.0"
Figure 4. MAX2406 EV Kit Layout—Ground Plane (layer 2)
Figure 5. MAX2406 EV Kit Layout—Bottom Side (solder side)
(layer 4)
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
© 1997 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.

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