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

33pF 5%, 50V C0G ceramic

capacitor (0402)

TDK C1005C0G1H330J

Taiyo Yuden UMK105CG330JV

2-pin header

C2, C4

52.3Ω 1% resistor (0402)

0Ω 5% resistor (0402)

100pF 5%, 50V C0G ceramic

capacitors (0402)

TDK C1005COG1H101J

Taiyo Yuden UMK105CG101JW

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

2200pF 10%, 50V X7R ceramic

capacitor (0402)

TDK C1005X7R1H222K

RFIN

Taiyo Yuden UMK105BJ222KW

Maxim high-output drive op amp

MAX4412EXK+ (5-pin SC70)

0.1µF 10%, 10V X5R ceramic

capacitors (0402)

TDK C1005X5R1A104K

Taiyo Yuden LMK105BJ104KV

—

Shunts

C5, C7, C8

PCB: MAX9930 Evaluation Kit+

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

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.

_______________________________________________________________________________________

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*

Installed*

Not installed

Disabled

Enabled

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

Not installed

*Default position.

X = a “don’t care” position.

loss due to the PCB. Each V

node on the PCB should

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

to the central V

node, can further minimize coupling

between sections of the PCB.

_______________________________________________________________________________________

MAX9930 Evaluation Kit

22nF

RFIN

VCC

52.3Ω

VCC

GND

RFIN

100pF

0.1μF

33pF

SHDN

SET

MAX9930

SHDN

SET*

CLPF

OUT

VCC

OUT

N.C.

GND

OPEN

0Ω

JU1

OPEN

100pF

2200pF

JU2

10kΩ

JU3

VCC

0.1μF

100Ω

14kΩ

MAX4412

Evluates:0–MAX93

0.1μF

10kΩ

*MAX9933 PIN 3 = GND

Figure 1. MAX9930 EV Kit Schematic

_______________________________________________________________________________________

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

_______________________________________________________________________________________

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

is a registered trademark of Maxim Integrated Products, Inc.

MAX9930EVKIT [MAXIM]

相关型号：

SI9130DB

SI9135LG-T1

SI9135LG-T1-E3

SI9135_11

SI9136_11

SI9130CG-T1-E3

SI9130LG-T1-E3

SI9130_11

SI9137

SI9137DB

SI9137LG

SI9122E