19-2574; Rev 0; 9/02
MAX4001 Evaluation Kit
General Description
The MAX4001 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board that evaluates
the MAX4001 RF-detecting controller in a 9-bump chip-
scale package (UCSP™). The MAX4001 EV kit includes
on-board shutdown control as well as quasi-measure-
ment mode circuitry to provide an easy method to eval-
uate the MAX4001. The RF input utilizes a 50Ω SMA
connector for convenient connection to test equipment.
The MAX4001 EV kit can also be used to evaluate the
MAX4000 and MAX4002 RF-detecting controllers.
o
50Ω SMA Connector on RF Input
o
Low-Profile Design (0.65mm, max)
o
On-Board Quasi-Measurement Mode Circuitry
o
On-Board Shutdown Control
o
Ultra-Compact Solution
o
Fully Assembled and Tested Surface-Mount
Board
Features
o
2.7V to 5.5V Single-Supply Operation
Evaluates: MAX4000/MAX4001/MAX4002
Ordering Information
PART
MAX4001EVKIT
TEMP RANGE
0°C to +70°C
IC PACKAGE
9 UCSP
Note:
To evaluate the MAX4000 or MAX4002, request a
MAX4000EBL or a MAX4002EBL free sample with the
MAX4001EVKIT.
Component List
DESIGNATION
C1, C3, C5
C2
C4
QTY
3
1
1
DESCRIPTION
0.1µF ±20%, 10V X5R ceramic
capacitors (0402)
TDK C1005X5R1A104M
Not installed (0402)
2200pF ±10%, 50V X7R ceramic
capacitor (0402)
TDK C1005X7R1H222K
33pF ±5%, 50V C0G ceramic
capacitor (0402)
TDK C1005C0G1H330J
100pF ±5%, 50V C0G ceramic
capacitors (0402)
TDK C1005C0G1H101J
2-pin headers
3-pin header
100Ω ±1% resistor (0402)
52.3Ω ±1% resistor (0402)
DESIGNATION
R3
R4
R5, R6, R8
R7
RFIN
U1
U2
None
None
None
None
QTY
1
1
3
1
1
1
1
3
1
1
1
DESCRIPTION
0Ω ±5% resistor (0402)
Not installed (0402)
10.0kΩ ±1% resistors (0402)
14.0kΩ ±1% resistor (0402)
SMA connector (PC edge-mount)
MAX4001EBL-T (9-bump UCSP)
Top mark: ABE
MAX4412EXK-T (5-pin SC70)
Top mark: ABH
Shunts
MAX4001 EV kit PC board
MAX4000/MAX4001/MAX4002
data sheet
MAX4001 EV kit data sheet
C6
1
C7, C8
JU1, JU2
JU3
R1
R2
2
2
1
1
1
Component Suppliers
SUPPLIER
TDK
PHONE
847-803-6100
FAX
847-390-4405
WEBSITE
www.component.tdk.com
Note:
Please indicate that you are using the MAX4001 when contacting this component supplier.
UCSP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________
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.
MAX4001 Evaluation Kit
Evaluates: MAX4000/MAX4001/MAX4002
Quick Start
Recommended Equipment
• One variable DC power supply capable of supplying
between 2.7V and 5.5V at 50mA
• One signal generator capable of delivering -35dBm
to +10dBm at frequencies between 900MHz and
2.5GHz
• One voltmeter
evaluate the MAX4000 and MAX4002 RF-detecting
controllers.
For operation in controller mode, both JU1 and JU2
should be removed. Use a DAC or external precision
voltage supply to apply the set-point voltage to the SET
pad. Connect the RF source (the Power Amplifier (PA)
output through a directional coupler) to the RFIN SMA
connector. Connect the gain control pin of the PA to the
OUT pad. When used in controller mode, a capacitor
(C4) must be present for loop stability (see the
Filter
Capacitor Selection
section).
To simulate an Automatic Gain-Control (AGC) loop, a
quasi-measurement mode can be implemented where
the MAX4001 delivers an output voltage that is propor-
tional to the log of the input signal (see the
Quasi-
Measurement Mode
section). To establish the transfer
function of the log amp, the RF input power level should
be swept while the voltage at the SET pad is measured.
This is the simplest method to validate operation of the
evaluation board.
Procedure
The MAX4001 EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Do
not turn on the power supply until all connections
are completed:
1) Set the variable DC power supply to 3V.
2) Ensure that the variable DC power supply is turned off.
3) Connect the positive terminal of the variable DC
power supply to the pad marked VCC. Connect the
ground return of the variable DC power supply to
the pad marked GND.
4) Set the signal generator to produce an output sig-
nal of 0dBm at a frequency of 2.5GHz.
5) Ensure that the signal generator is turned off.
6) Connect the signal generator to the edge-mount
SMA connector marked RFIN.
7) Connect the positive terminal of the voltmeter to the
pad marked SET. Connect the ground return of the
voltmeter to the pad marked GND.
8) Ensure that shunts are installed across jumpers JU1
and JU2.
9) Ensure that a shunt is placed across pin 1 and pin
2 of jumper JU3.
10) Turn on the variable DC power supply.
11) Turn on/enable the output of the signal generator.
12) Verify with the voltmeter that an output voltage of
1.2V (±5%) is produced between the SET pad and
the GND pad.
Shutdown Control
Jumper JU3 controls the CMOS-compatible shutdown
pin (SHDN) of the MAX4001, which disables the
MAX4001. Removing the shunt from JU3 allows the
SHDN
pin to be driven with an external signal source
connected to the
SHDN
pad (see Table 1 for shutdown
shunt positions).
Table 1. Shutdown Selection
JUMPER
SHUNT
POSITION
1–2
2–3
Not Installed
DESCRIPTION
MAX4001 enabled
MAX4001 disabled
SHDN
pin driven by an
external signal source
JU3
Quasi-Measurement Mode
Enabling the quasi-measurement mode changes the
MAX4001 EV kit function from a PA controller to a log
detector. This mode allows for easy measurement of
RFIN versus the SET voltage and these measurements
can then be used to find the intercept and slope
required for the given application.
Placing shunts across JU1 and JU2 enables the quasi-
measurement mode (which connects the OUT voltage
through an inverting op amp to the SET pin). The quasi-
measurement mode yields a nominal relationship
between RFIN and SET (see Table 2 for quasi-mea-
surement mode shunt positions).
Detailed Description
The MAX4001 EV kit is a fully assembled and tested
surface-mount circuit board that evaluates the
MAX4001 RF-detecting controller. The MAX4001 EV kit
includes on-board shutdown control as well as quasi-
measurement mode circuitry to provide an easy
method to evaluate the MAX4001. The RF input utilizes
a 50Ω SMA connector for convenient connection to test
equipment. The MAX4001 EV kit can also be used to
2
_______________________________________________________________________________________
MAX4001 Evaluation Kit
Table 2. Quasi-Measurement Mode
Selection
JUMPER
SHUNT
POSITION
Installed
JU1, JU2
Not Installed
Quasi-measurement mode
disabled
DESCRIPTION
Quasi-measurement mode
enabled
Evaluating the MAX4002
The MAX4001 can be replaced with the MAX4002 to
allow an input range of -30dBm to +15dBm in 50Ω. The
modifications required are as follows:
1) Replace U1 with a MAX4002EBL.
Evaluates: MAX4000/MAX4001/MAX4002
Layout Considerations
A good PC board is an essential part of RF circuit
design. The MAX4001 EV kit PC board can serve as a
guide for laying out a board using the MAX4000/
MAX4001/MAX4002. Keep traces carrying RF signals
as short as possible to minimize radiation and insertion
loss due to the PC board. Each VCC node on the PC
board should have its own decoupling capacitor. This
minimizes supply coupling from one section of the PC
board to another. Using a star topology for the supply
layout, in which each VCC node in the circuit has a
separate connection to the central VCC node, can fur-
ther minimize coupling between sections of the PC
board.
Filter Capacitor Selection
When functioning as a PA controller, the MAX4001
requires some capacitance to maintain loop stability.
Global System for Mobile (GSM) applications require a
control-loop bandwidth of at least 150kHz. A 2200pF
capacitor, C4, is installed to obtain this control-loop
bandwidth. Refer to the Gain and Phase vs. Frequency
graph in the
Applications Information
section of the
MAX4000/MAX4001/MAX4002 data sheet for alternative
capacitor values.
Evaluating the MAX4000/MAX4002
Evaluating the MAX4000
The MAX4001 can be replaced with the MAX4000 to
allow an input range of -45dBm to 0dBm into 50Ω. The
modifications required are as follows:
1) Replace U1 with a MAX4000EBL.
2) Replace C6 with a 0Ω (0402) resistor.
_______________________________________________________________________________________
3
MAX4001 Evaluation Kit
Evaluates: MAX4000/MAX4001/MAX4002
C6
33pF
A1
R2
52.3Ω
1%
SHDN
JU3
3
SET
C8
100pF
B3
JU1
C4
2200pF
CLPF
R5
10kΩ
1%
VCC
R6
10kΩ
1%
VCC
R7
14kΩ
1%
R8
10kΩ
1%
C3
0.1µF
GND
C3
A3
RFIN
V
CC
B1
C1
C7
100pF
C1
0.1µF
VCC
VCC
RFIN
SMA
VCC
1
2
A2
U1
MAX4001
SHDN
V
CC
GND
OUT
SET
C2
R3
0Ω
C2
OPEN
OUT
JU2
R4
OPEN
C5
0.1µF
R1
100Ω
1%
5
1
4
3
2
U2
MAX4412
Figure 1. MAX4001 EV Kit Schematic
4
_______________________________________________________________________________________
MAX4001 Evaluation Kit
Evaluates: MAX4000/MAX4001/MAX4002
Figure 2. MAX4001 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX4001 EV Kit PC Board Layout—Component Side
Figure 4. MAX4001 EV Kit PC Board Layout—Ground Plane on
Layers 2 and 3
Figure 5. MAX4001 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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________
5
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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