MAXIM MAX2410_1

19-1320; Rev 1; 3/98
MAX2410 Evaluation Kit
____________________________Features
The MAX2410 evaluation kit (EV kit) simplifies testing of the
MAX2410. This EV kit allows evaluation of the MAX2410’s
low-noise amplifier (LNA), receive downconverter
mixer, transmit upconverter mixer, variable-gain poweramplifier (PA) driver, and power-management features.
♦ +2.7V to +5.5V Single-Supply Operation
_ ___________________Component List
DESIGNATION QTY
C1, C2
♦ 50Ω SMA Inputs and Outputs on RF and IF Ports
♦ Allows Testing of Shutdown Mode
♦ Fully Assembled and Tested
_______________Ordering Information
DESCRIPTION
2
47pF ceramic capacitors, 0603 size
C3
1
10µF tantalum capacitor
AVX TAJC106K016
C4, C5,
C6, C8
4
0.1µF ceramic capacitors, 0805 size
C7, C10, C11,
C16, C17,
C19, C20
7
220pF ceramic capacitors, 0805 size
C9, C15, C18,
C23, C24
5
1000pF ceramic capacitors, 0805 size
C12, C14,
C22, C25, C26
0
Not installed
C21
1
1pF ceramic capacitor, 0805 size
L1
1
18nH inductor, 0805 size
Coilcraft 0805CS-180XMBC
L2
1
5.6nH inductor, 0805 size
Taiyo Yuden HK16085N6S
L3, L12
2
68nH inductors, 0805 size
Coilcraft 0805CS-680XKBC
L4, L5
2
0Ω resistors, 0805 size
L6, L7, L9
0
Not installed
L8, L13
2
3.9nH inductors, 0805 size
Taiyo Yuden HK16083N9S
L11
1
82nH inductor, 0805 size
Coilcraft 0805CS-820XKBC
R1, R2, R3
3
1kΩ resistors, 0805 size
LNAIN,
LNAOUT, IFIN,
IFOUT, LO,
PADRIN,
PADROUT,
TXMXOUT
8
SMA edge-mount connectors
RXMXIN
1
SMA PC-mount connector
RXEN, TXEN,
VGC
3
3-pin headers
VCC, GND
2
2-pin headers
U1
1
MAX2410EEI 28-pin QSOP
PART
MAX2410EVKIT
TEMP. RANGE
IC-PACKAGE
-40°C to +85°C
28 QSOP
______________Component Suppliers
SUPPLIER
PHONE
INTERNET
AVX
(803) 946-0690
(803) 626-3123 FAX
http://www.avxcorp.com
Coilcraft
(847) 639-6400
(847) 639-1469 FAX
http://www.coilcraft.com
Taiyo Yuden
USA
(408) 573-4150
(408) 573-4159 FAX
http://www.t-yuden.com
_________________________Quick Start
The MAX2410 EV kit is fully assembled and factory tested. Follow these instructions for initial evaluation of the
MAX2410.
Test Equipment Required
This section lists the recommended test equipment to
verify operation of the MAX2410. It is intended as a
guide only, and some substitutions may be possible.
• Two RF signal generators capable of delivering at
least 0dBm of output power up to 2GHz (HP8648C,
or equivalent).
• An RF spectrum analyzer that covers the operating
frequency range of the MAX2410 as well as a few
harmonics (HP8561E, for example).
• A power supply which can provide up to 100mA at
+2.7V to +5.5V.
• A voltage source (0V to 5V) for adjusting the gaincontrol (GC) voltage on the PA driver.
• An optional ammeter for measuring the supply current.
• Several 50Ω SMA cables.
________________________________________________________________ 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 1-800-835-8769.
Evaluates: MAX2410
________________General Description
Evaluates: MAX2410
MAX2410 Evaluation Kit
Connections and Setup
This section provides a step-by-step guide to operating
the EV kit and testing all four major functions: the LNA,
receive mixer, transmit mixer, and PA driver. Do not
turn on the DC power or RF signal generators until
all connections are made.
Low-Noise Amplifier
1) Set the RXEN jumper on the EV kit to the “Logic 1”
position and the TXEN jumper to the “Logic 0” position. This enables the MAX2410’s receive mode.
2) Connect a DC supply set to 3V (through an ammeter if desired) to the VCC and GND terminals on the
EV kit. Do not turn on the supply.
3) 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
at a power level of -40dBm.
4) Connect a spectrum analyzer to the LNAOUT SMA
connector on the EV kit. Set it to a center frequency
of 1.9GHz, a total span of 200MHz, and a reference
level of 0dBm.
5) Turn on the DC supply. The supply current should
read approximately 20mA (if using an ammeter).
6) Activate the RF generator’s output. A signal on the
spectrum analyzer’s display should indicate a typical gain of 16.2dB after accounting for cable losses.
7) If desired, the shutdown feature can be tested by
moving the RXEN jumper into the “Logic 0” position.
The supply current should drop to less than 10µA.
Receive Downconverter Mixer
1) Remove the RF signal generator and spectrum analyzer 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. Turn off the DC supply while making connections.
2) Set the RXEN jumper on the EV kit to the “Logic 1”
position and the TXEN jumper to the “Logic 0” position. This enables the MAX2410’s receive mode.
3) Connect one RF signal generator (with the output
disabled) to the LO SMA connector. Set the frequency to 1.5GHz and the output power to -10dBm.
This is the LO signal.
4) Connect the other RF signal generator to the RXMXIN
SMA connector (with the output disabled). Set the
frequency to 1.9GHz and the output power to
-30dBm. This is the RF input signal.
2
5) Connect the spectrum analyzer to the IFOUT SMA
connector. Set the spectrum analyzer to a 400MHz
center frequency, a 200MHz total span, and a
0dBm reference level.
6) Turn on the DC supply, LO signal generator, and RF
input signal generator.
7) The downconverted output signal at 400MHz is visible on the spectrum analyzer, indicating a mixer
conversion gain of typically 8.3dB after accounting
for cable losses.
Power-Amplifier Driver
1) Remove any RF signal connections made in the
above tests. The VCC and GND connections should
remain as before. Turn off the VCC supply while
making connections.
2) Set the RXEN jumper to the “Logic 0” position and
the TXEN jumper to the “Logic 1” position. This
enables the MAX2410’s transmit mode.
3) Set the voltage source to be used for the gain-control voltage to 2.15V, and turn it off. Connect it to the
middle pin of the VGC jumper on the EV kit.
4) Connect an RF signal generator set to 1.9GHz, at a
power level of -10dBm with the output disabled, to
the PADRIN SMA connector.
5) Connect the PADROUT SMA connector to the spectrum analyzer. Configure the analyzer to a center
frequency of 1.9GHz, a reference level of +10dBm,
and 200MHz total span.
6) Turn on the DC supply, VGC voltage source, and RF
signal generator.
7) The supply current should read typically 30mA. A
1.9GHz signal should be visible on the spectrum
analyzer’s display indicating a typical gain of 15dB
after accounting for cable losses.
8) Lowering the voltage on the VGC voltage source to
0V should reduce the gain by typically 35dB.
Transmit Upconverter Mixer
1) Remove any RF signal connections made in the
above tests. The VCC and GND connections should
remain as before. Turn off the VCC supply. The VGC
voltage source is not needed for this test.
2) Set the RXEN jumper to the “Logic 0” position and
the TXEN jumper to the “Logic 1” position. This
enables the MAX2410’s transmit mode.
3) Connect one RF signal generator (with the output
disabled) to the LO SMA connector. Set the frequency to 1.5GHz and the output power to -10dBm.
This is the LO signal.
_______________________________________________________________________________________
MAX2410 Evaluation Kit
7) The supply current should typically read 30mA. The
spectrum analyzer should show a 1.9GHz signal
indicating a conversion gain of typically 10dB after
accounting for cable losses.
8) To observe the remainder of the TX mixer output
spectrum, increase the span on the spectrum analyzer from 200MHz to 2GHz.
_______________Detailed Description
The MAX2410 EV kit circuitry is described in this section. For more detailed information about the operation
of the device itself, please consult the MAX2410 data
sheet.
Receiver
This section describes the LNA and receive mixer sections of the MAX2410 EV kit.
Low-Noise Amplifier
The LNA circuitry consists of two DC blocking capacitors, one at the input (C7) and one at the output (C17).
A shunt capacitor (C21) is used as a simple input
matching network.
IF Output
The IFOUT pin of the MAX2410 is an open-collector
output that is externally biased to VCC by inductor L3
and matched with inductors L3 and L12. C24 provides
DC blocking. There are additional component footprints
available on the EV kit layout for designing a more complex matching network: C12, C26, L5, and L9.
RX Mixer Input
The receive mixer’s input, RXMXIN, requires a simple
matching network. Capacitor C16 provides DC blocking, and L8 is used to match the input pin to 50Ω.
Component footprint (C22) is available for additional
matching network prototyping.
Transmitter
This section describes the PA driver and transmit mixer
sections of the MAX2410 EV kit.
PA Driver Amplifier
The PA driver amplifier input is internally matched to
50Ω for 1.9GHz operation. Capacitor C11 is necessary
for DC blocking. The gain of the PA driver is adjustable
by applying a voltage on the middle pin of the V GC
jumper, which is connected through a 1kΩ resistor (R3)
to the GC pin of the MAX2410. C8 and R3 form a filter
to reduce any noise from the VGC supply. Alternatively,
by inserting a shunt, it is possible to set this voltage to
ground or VCC. The position labeled “Logic 0” is connected to ground, and the “Logic 1” position is set to
VCC.
IF Input
The IFIN pin of the MAX2410 is a high-impedance input
that is internally biased. Inductor L11 provides a simple
matching network. C23 is used for DC blocking. As with
the IFOUT pin above, additional component footprints
have been placed to allow further experimentation:
C14, C25, L4, L6, and L7.
TX Mixer Output
The transmit mixer output appears on the TXMXOUT
pin, which requires a pull-up inductor (L2) to VCC as
well as a matching network to a 50Ω load impedance
consisting of inductors L2 and L13. C19 serves as a
DC block.
Local Oscillator
The MAX2410 EV kit’s LO input only requires a DC
blocking capacitor (C20). No other circuitry is required.
For more information on the LO port, including the
optional use of a differential LO source, consult the
MAX2410 data sheet.
________________Power Management
The RXEN and TXEN jumpers on the EV kit control the
operating modes of the MAX2410. Refer to the
MAX2410 data sheet for a table of operating modes.
Series resistors R1 and R2 and capacitors C5 and C6
are included on the RXEN and TXEN inputs to provide
filtering between logic and RF circuitry.
______________________________Layout
A good PC board is an essential part of an RF circuit
design. The EV kit PC board can serve as a guide for
laying out a board using the MAX2410.
Each VCC node on the PC board should have its own
decoupling capacitor. This minimizes supply coupling
from one section of the MAX2410 to another. A star
topology for the supply layout, in which each VCC node
on the MAX2410 circuit has a separate connection to a
central V CC node, can further minimize coupling
between sections of the MAX2410 (Figure 5).
_______________________________________________________________________________________
3
Evaluates: MAX2410
4) Connect the other RF signal generator (with the output disabled) to the IFIN SMA connector. Set the
generator to a frequency of 400MHz and a power
level of -32dBm. This is the IF signal.
5) Connect the TXMXOUT SMA connector to the spectrum analyzer. Configure the analyzer for a center
frequency of 1.9GHz, a reference level of 0dBm,
and 200MHz total span.
6) Turn on the DC supply, LO signal generator, and IF
signal generator.
Evaluates: MAX2410
MAX2410 Evaluation Kit
LNAOUT
SMA
L8
3.9nH
C17
27 220pF
1
C7
220pF
2
LNAIN
SMA
C21
1pF
3
4
LNAOUT
GND
GND
LNAIN
RXMXIN
GND
IFIN
GND
GND
28
5
VCC
GND
MAX2410
L11
82nH
22
L4
SHORT
7
8
26
10
C2
47pF
12
14
25
LO
C15
1000pF
LO
IFOUT
VCC
GND
GND
L3
68nH
L12
68nH
TXMXOUT
13
PADROUT
SMA
PADROUT
C10
220pF
JU2
6
IFOUT
SMA
C26
OPEN
20
C18
1000pF
9
GC
11
GND
15
GND
17
L2
5.6nH
19
16
L9
OPEN
L13
3.9nH
PADRIN
SMA
C11
220pF
GND
18
JU1
VCC
R1
1k
LOGIC 0
TXEN
PADRIN
RXEN TXEN
VCC
C24
1000pF
C12
OPEN
23
C9
1000pF
L1
18nH
L5
SHORT
VCC
GND
VCC
21
GND
VCC
VGC
L7
OPEN
L6
OPEN
VCC
JU3
IFIN
SMA
C25
OPEN
VCC
LO
SMA
VCC
C23
1000pF
C14
OPEN
C20
220pF
LOGIC 1
C16
220pF
24
VCC
C1
47pF
RXMXIN
SMA
C22
OPEN
C5
0.1µF
VCC
RXEN
GND
R2
1k
C6
0.1µF
R3
1k
C3
10µF
C4
0.1µF
C8
0.1µF
Figure 1. MAX2410 EV Kit Schematic
4
_______________________________________________________________________________________
C19
220pF
TXMXOUT
SMA
MAX2410 Evaluation Kit
Evaluates: MAX2410
1.0"
1.0"
Figure 2. MAX2410 EV Kit Component Placement Guide
Figure 3. MAX2410 EV Kit PC Board Layout—Component Side
_______________________________________________________________________________________
5
Evaluates: MAX2410
MAX2410 Evaluation Kit
1.0"
Figure 4. MAX2410 EV Kit PC Board Layout—Ground Plane
6
1.0"
Figure 5. MAX2410 EV Kit PC Board Layout—Solder Side
_______________________________________________________________________________________
MAX2410 Evaluation Kit
_______________________________________________________________________________________
Evaluates: MAX2410
NOTES
7
Evaluates: MAX2410
MAX2410 Evaluation Kit
NOTES
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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 1998 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.