MAX9911EVKIT+ [MAXIM]

Accommodates Easy-to-Use 0805 Components;


型号：	MAX9911EVKIT+
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Accommodates Easy-to-Use 0805 Components
文件：	总6页 (文件大小：2309K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-5734; Rev 0; 1/11

MAX9911 Evaluation Kit

General Description

Features

S_ 1.8V_to_5.5V_Supply_Voltage_Range

S_ Accommodates_Multiple_Op-Amp_Configurations

S_ Component_Pads_Allow_for_Sallen-Key_Filter

S_ Rail-to-Rail_Inputs/Outputs

The MAX9911 evaluation kit (EV kit) provides a proven

design to evaluate the MAX9911 low-power, MOS-input

operational amplifier (op amp) in a 6-pin wafer-level

package (WLP). The EV kit circuit is preconfigured as

a noninverting amplifier, but can easily be adapted to

other topologies by changing a few components. Low

S_ Accommodates_Easy-to-Use_0805_Components

S_ Proven_PCB_Layout

power, low-input V , and rail-to-rail input/output stages

make this device ideal for a variety of measurement

applications. The component pads accommodate 0805

packages, making them easy to solder and replace. The

EV kit comes with a MAX9911EWT+ installed.

S_ Fully_Assembled_and_Tested

Ordering Information

PART

TYPE

MAX9911EVKIT+

EV Kit

+Denotes lead(Pb)-free and RoHS compliant.

Component List

DESIGNATION

QTY

DESCRIPTION

DESIGNATION

R1, R2

QTY

DESCRIPTION

1kI Q1% resistors (0805)

10kI Q1% resistor (0805)

0I Q5% resistors (0805)

0.1FF Q10%, 16V X7R ceramic

capacitor (0603)

Murata GRM188R71C104K

R6, R8

4.7FF Q10%, 6.3V X5R ceramic

capacitor (0603)

Murata GRM188R60J475K

Single low-power, rail-to-rail I/O

op amp (6 WLP)

Maxim MAX9911EWT+

—

Shunts

Not installed, ceramic capacitors

(0805)

C3, C4, C8, C9

PCB: MAX9911 EVALUATION

KIT+

JU1

JU2

2-pin header

3-pin header

Component Supplier

SUPPLIER

Murata Electronics North America, Inc.

PHONE

WEBSITE

770-436-1300

www.murata-northamerica.com

Note: Indicate that you are using the MAX9911 when contacting this component supplier.

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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.

MAX9911 Evaluation Kit

Quick Start

Required Equipment

Detailed Description of Hardware

The MAX9911 EV kit provides a proven layout for the

MAX9911 low-power, MOS-input op amp. The device is

a single-supply op amp that is ideal for buffering sensor

signals. The Sallen-Key topology is easily accomplished

by changing and removing some components. The

Sallen-Key topology is ideal for buffering and filtering

sensor signals.

•

MAX9911 EV kit

+5V, 10mA DC power supply (PS1)

Precision voltage source

Digital multimeter (DMM)

Procedure

Op-Amp Configurations

The device is a single-supply op amp that is ideal for

differential sensing, noninverting amplification, buffering,

and filtering. A few common configurations are detailed

in the next few sections.

The EV kit is fully assembled and tested. Follow the steps

below to verify board operation:

1) Verify that jumpers are in their default positions, as

shown in Table 1.

2) Connect the positive terminal of the +5V supply to

the VDD PCB pad and the negative terminal to the

GND PCB pad closest to VDD.

Noninverting Configuration

The EV kit comes preconfigured as a noninverting

amplifier. The gain is set by the ratio of R5/R1. The EV

kit comes preconfigured for a gain of +11. For a volt-

age applied to the IN+ PCB pad, the output voltage for

the noninverting configuration is given by the equation

below:

3) Connect the positive terminal of the precision volt-

age source to the IN+ PCB pad. Connect the nega-

tive terminal of the precision voltage source to GND

(GND or IN- PCB pads).

4) Connect the DMM to monitor the voltage on the OUT

PCB pad. With the 10kI feedback resistor (R5) and

1kI series resistor (R1), the gain is +11 (noninvert-

ing configuration).

= (1+

)(V

)

OUT

IN+ OS

where V

= input-referred offset voltage.

5) Turn on the +5V power supply.

6) Apply 100mV from the precision voltage source.

Observe the output at OUT on the DMM. OUT

should read approximately +1.1V.

Differential Amplifier

To configure the EV kit as a differential amplifier, replace

R1, R2, R , and R5 with appropriate resistors. When R1

= R2 and R = R5, the CMRR of the differential amplifier

is determined by the matching of the resistor ratios R1/

7) Apply 400mV from the precision voltage source.

OUT should read approximately +4.4V.

R2 and R /R5:

Table_1._Jumper_Descriptions_(JU1,_JU2)

= Gain(V

− V ) + (1+

OUT

IN+

IN−

SHUNT_

POSITION

JUMPER

DESCRIPTION

where:

Connects the IN- PCB pad to

GND.

Installed*

JU1

Gain =

Isolates the IN- PCB pad from

GND.

Open

1-2*

2-3

Connects SHDN to VDD

(normal operation).

JU2

Connects SHDN to GND

(shutdown).

*Default position.

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MAX9911 Evaluation Kit

Sallen-Key Configuration

The Sallen-Key topology is ideal for filtering sensor

signals with a 2nd-order filter and acting as a buffer.

Schematic complexity is reduced by combining the filter

and buffer operations. The EV kit can be configured in

a Sallen-Key topology by replacing and populating a

few components. The Sallen-Key topology is typically

configured as a unity-gain buffer, which can be done

by replacing R1 and R5 with 0I resistors. The signal is

noninverting and applied to IN+. The filter component

pads are R2, R3, R4, and R8, where some have to be

populated with resistors and others with capacitors.

Highpass Sallen-Key Filter

To configure the Sallen-Key as a highpass filter, populate

the C3 and C4 pads with resistors and the R2 and R8

pads with capacitors. The corner frequency and Q are

then given by:

2π C ×R × C ×R

×R × C ×R

C4 R2 C3

Q =

(C + C

)

R3 R2

Lowpass Sallen-Key Filter

To configure the Sallen-Key as a lowpass filter, populate

the R2 and R8 pads with resistors and the C3 and C4

pads with capacitors. The corner frequency and Q are

then given by:

Capacitive Loads

Some applications require driving large capacitive loads.

To improve the stability of the amplifier in such cases,

replace R6 with a suitable resistor value to improve

amplifier phase margin in the presence of the capacitive

load (C9), or apply a resistive load in parallel with C9.

2π R2× C3×R8× C4

R2× C3×R8× C4

C4(R2 + R8)

Q =

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MAX9911 Evaluation Kit

Figure 1. MAX9911 EV Kit Schematic

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MAX9911 Evaluation Kit

1.0”

Figure 3. MAX9911 EV Kit PCB Layout—Component Side

Figure 2. MAX9911 EV Kit Component Placement Guide—

Component Side

1.0”

Figure 4. MAX9911 EV Kit PCB Layout—Solder Side

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MAX9911 Evaluation Kit

Revision History

REVISION REVISION

PAGES

CHANGED

DESCRIPTION

NUMBER

DATE

1/11

Initial release

—

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

2011 Maxim Integrated Products

Maxim is a registered trademark of Maxim Integrated Products, Inc.

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