MAX9930EVKIT [MAXIM]
On-Board Quasi-Measurement Mode Circuitry;型号: | MAX9930EVKIT |
厂家: | MAXIM INTEGRATED PRODUCTS |
描述: | On-Board Quasi-Measurement Mode Circuitry |
文件: | 总6页 (文件大小:138K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
19-0962; Rev 0; 8/07
MAX9930 Evaluation Kit
Evluates:0–MAX93
General Description
Features
♦ 2.7V to 5.25V Single-Supply Operation
♦ 50Ω SMA Connector on RF Input
The MAX9930 evaluation kit (EV kit) is a fully assembled
and tested surface-mount printed-circuit board (PCB)
that evaluates the MAX9930 RF-detecting controller.
The MAX9930 EV kit includes on-board shutdown con-
trol, as well as quasi-measurement mode circuitry to
provide an easy method to evaluate the MAX9930. The
RF input utilizes a 50Ω SMA connector for convenient
connection to test equipment.
♦ On-Board Quasi-Measurement Mode Circuitry
♦ On-Board Shutdown Control
♦ Fully Assembled and Tested Surface-Mount PCB
Ordering Information
The MAX9930 EV kit comes with the MAX9930EUA+
installed, but can also be used to evaluate the
MAX9931/MAX9932 RF-detecting controllers and the
MAX9933 RF detector. To evaluate the MAX9931,
MAX9932, or MAX9933, request a MAX9931EUA+, a
MAX9932EUA+, or a MAX9933EUA+ free sample with
the MAX9930 EV kit.
PART
TEMP RANGE
IC PACKAGE
8 µMAX®
MAX9930EVKIT+
0°C to +70°C*
+Denotes a lead-free and RoHS-compliant EV kit.
*This limited temperature range applies to the EV kit PCB only.
The MAX9930 IC temperature range is -40°C to +85°C.
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
3-pin headers
JU1, JU2
JU3
2
1
1
1
0
3
1
1
1
1
33pF 5%, 50V C0G ceramic
capacitor (0402)
TDK C1005C0G1H330J
Taiyo Yuden UMK105CG330JV
2-pin header
C1
C2, C4
C3
1
2
1
R1
52.3Ω 1% resistor (0402)
0Ω 5% resistor (0402)
R2
100pF 5%, 50V C0G ceramic
capacitors (0402)
TDK C1005COG1H101J
Taiyo Yuden UMK105CG101JW
R3
Not installed, resistor (0402)
10kΩ 1% resistors (0402)
100Ω 1% resistor (0402)
14kΩ 1% resistor (0402)
SMA connector (PC edge mount)
MAX9930EUA+ (8-pin µMAX)
R4, R5, R8
R6
R7
2200pF 10%, 50V X7R ceramic
capacitor (0402)
TDK C1005X7R1H222K
RFIN
U1
Taiyo Yuden UMK105BJ222KW
Maxim high-output drive op amp
MAX4412EXK+ (5-pin SC70)
U2
1
0.1µF 10%, 10V X5R ceramic
capacitors (0402)
TDK C1005X5R1A104K
Taiyo Yuden LMK105BJ104KV
—
—
3
1
Shunts
C5, C7, C8
3
0
1
PCB: MAX9930 Evaluation Kit+
C6
C9
Not installed, capacitor (0402)
Component Suppliers
22nF 10%, 16V X7R ceramic
capacitor (0402)
TDK C1005X7R1C223K
Taiyo Yuden EMK105BJ223KV
SUPPLIER
Taiyo Yuden
TDK Corp.
PHONE
WEBSITE
800-348-2496 www.t-yuden.com
847-803-6100 www.component.tdk.com
Note: Indicate that you are using the MAX9930 when contact-
ing these component suppliers.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX9930 Evaluation Kit
__________________________Quick Start
Recommended Equipment
Before beginning, the following equipment is needed:
Detailed Description
The MAX9930 EV kit is a fully assembled and tested sur-
face-mount PCB that evaluates the MAX9930 RF-detect-
ing controller. The MAX9930 EV kit can also be used to
evaluate the MAX9931/MAX9932 RF-detecting con-
trollers and the MAX9933 RF detector. The MAX9930 EV
kit includes on-board shutdown control, as well as quasi-
measurement mode circuitry to provide an easy method
to evaluate the MAX9930, MAX9931, and MAX9932. The
RF input utilizes a 50Ω SMA connector for convenient
connection to test equipment.
•
•
•
One variable DC power supply capable of supplying
between 2.7V and 5.25V at 50mA
One signal generator capable of delivering -45dBm
to +0dBm at frequencies between 2MHz and 1.6GHz
One voltmeter
Procedure
The MAX9930 EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Caution: Do not turn on the power supply until all
connections are completed.
For operation in controller mode, both JU2 and JU3
should be removed. Use a DAC or external precision
voltage supply to apply the set-point voltage to the SET
pad. RFIN is connected to the RF source—power ampli-
fier (PA) output through a directional coupler—and the
OUT pad is connected to the gain-control pin of the PA.
When used in controller mode, a capacitor must be
installed in C3 for loop stability (see the Filter Capacitor
Selection section).
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.
To simulate an automatic gain-control (AGC) loop, a
quasi-measurement mode can be implemented where
the MAX9930 delivers an output voltage that is
proportional 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.
4) Set the signal generator to produce an output
signal of 0dBm at a frequency of 50MHz.
5) Ensure that the signal generator is turned off.
6) Connect the signal generator to the edge-mount
SMA connector marked RFIN.
Evluates:0–MAX93
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.
Shutdown Control
Jumper JU1 controls the CMOS-compatible shutdown
pin (SHDN) of the MAX9930, which disables the
MAX9930. Removing the shunt from JU1 allows the
SHDN pin to be driven with an external signal source
connected to the SHDN pad (see Table 1 for shutdown
shunt positions).
8) Ensure that a shunt is installed across pins 1-2 of
jumper JU1.
9) Ensure that a shunt is installed across pins 2-3 of
jumper JU2.
Table 1. Shutdown Selection
10) Ensure that a shunt is installed across jumper JU3.
11) Turn on the variable DC power supply.
JUMPER SHUNT POSITION
DESCRIPTION
MAX9930 enabled
1-2*
12) Turn on/enable the output of the signal generator.
2-3
MAX9930 disabled
13) Verify with the voltmeter that an output voltage of
approximately 1.4V is produced between the SET
pad and the GND pad.
JU1
SHDN pin driven by an
external signal source
Not installed
*Default position.
2
_______________________________________________________________________________________
MAX9930 Evaluation Kit
Evluates:0–MAX93
bandwidth. Refer to the Gain and Phase vs. Frequency
graph in the Applications Information section of the
MAX9930/MAX9931/MAX9932 IC data sheet for
alternative capacitor values.
Quasi-Measurement Mode
Enabling the quasi-measurement mode changes the
MAX9930 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.
Evaluating the MAX9931/MAX9932
The MAX9930 can be replaced with the MAX9931 to
allow an input range of -35dBm to +10dBm into 50Ω, or
with the MAX9932 to allow an input range of -30dBm to
+15dBm into 50Ω. Replace U1 with a MAX9931EUA+
or MAX9932EUA+.
Place a shunt on pins 2-3 of JU2 and install a shunt
across JU3 to enable the quasi-measurement mode. This
configuration 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-measurement mode
shunt positions.
Evaluating the MAX9933
The MAX9930 can be replaced with the MAX9933 to
allow an input range of -45dBm to +0dBm into 50Ω.
Replace U1 with a MAX9933EUA+. Once a MAX9933
IC is installed on U1, remove the shunt on JU3 to dis-
connect the quasi-measurement mode circuitry. Place
the shunt on pins 1-2 of JU2 to connect pin 3 of the
MAX9933 to ground. The voltage on the OUT pad
reflects the power level of the RF input signal.
Table 2. Quasi-Measurement Mode
Selection
SHUNT POSITION
QUASI-MEASUREMENT MODE
JU2
JU3
1-2
2-3*
X
Installed*
Not installed
X
Disabled
Enabled
Disabled
Disabled
Layout Considerations
A good PCB layout is an essential part of RF
circuit design. The MAX9930EV kit PCB can serve
as a guide for laying out a board using the
MAX9930–MAX9933. Keep traces carrying RF signals
as short as possible to minimize radiation and insertion
X
Not installed
*Default position.
X = a “don’t care” position.
loss due to the PCB. Each V
node on the PCB should
CC
have its own decoupling capacitor. This minimizes sup-
ply coupling from one section of the PCB to another.
Using a star topology for the supply layout, in which
Filter Capacitor Selection
When functioning as a PA controller, the MAX9930
requires some capacitance to maintain loop stability.
Global Satellite Mobile (GSM) applications require a
control-loop bandwidth of at least 150kHz. A 2200pF
capacitor (C4) is installed to obtain this control-loop
each V
node in the circuit has a separate connection
CC
to the central V
node, can further minimize coupling
CC
between sections of the PCB.
_______________________________________________________________________________________
3
MAX9930 Evaluation Kit
C9
22nF
RFIN
VCC
R1
52.3Ω
1%
VCC
GND
1
2
3
4
8
RFIN
V
CC
U1
C4
100pF
C5
0.1μF
C1
33pF
SHDN
SET
MAX9930
SHDN
SET*
CLPF
OUT
VCC
7
6
5
OUT
N.C.
GND
2
3
1
C6
OPEN
R2
0Ω
JU1
R3
OPEN
C2
100pF
C3
2200pF
2
3
1
JU2
R4
10kΩ
1%
R5
10kΩ
1%
JU3
VCC
VCC
C8
0.1μF
R6
4
5
100Ω
1%
R7
14kΩ
1%
U2
1
MAX4412
3
2
Evluates:0–MAX93
C7
0.1μF
R8
10kΩ
1%
*MAX9933 PIN 3 = GND
Figure 1. MAX9930 EV Kit Schematic
4
_______________________________________________________________________________________
MAX9930 Evaluation Kit
Evluates:0–MAX93
Figure 2. MAX9930 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX9930 EV Kit PCB Layout—Component Side
Figure 4. MAX9930 EV Kit PCB Layout—Ground Plane on
Layer 2
Figure 5. MAX9930 EV Kit PCB Layout—Ground Plane on
Layer 3
_______________________________________________________________________________________
5
MAX9930 Evaluation Kit
Figure 6. MAX9930 EV Kit PCB Layout—Solder Side
Evluates:0–MAX93
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.
6 _________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2007 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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