MAX9613EVKIT [MAXIM]

Fully Assembled and Tested;


型号：	MAX9613EVKIT
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Fully Assembled and Tested
文件：	总6页 (文件大小：849K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-5190; Rev 0; 3/10

MAX9613 Evaluation Kit

General Description

Features

S Accommodates Multiple Op-Amp Configurations

The MAX9613 evaluation kit (EV kit) provides a proven

design to evaluate the MAX9613 low-power, MOS-input

operational amplifier (op amp) in a 6-pin SC70 package.

The EV kit circuit is preconfigured as a noninverting

amplifier, but can easily be adapted to other topologies

by changing a few components. Low-power, low-input

Vos, 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 MAX9613AXT+ installed.

Component Pads Allow for Sallen-Key Filter

S Rail-to-Rail Inputs/Outputs

S Accomodates Easy-to-Use 0805 Components

S Proven PCB Layout

S Fully Assembled and Tested

Ordering Information

PART

TYPE

MAX9613EVKIT+

EV Kit

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

Component List

DESIGNATION QTY

DESCRIPTION

DESIGNATION QTY

DESCRIPTION

3-pin header

JU2

R1, R2

0.1FF Q10%, 16V X7R ceramic

capacitor (0603)

Murata GRM188R71C104K

1kI Q1% resistors (0805)

10kI Q1% resistor (0805)

0I Q5% resistors (0805)

Red multipurpose test point

R6, R8

VDD

4.7FF Q10%, 6.3V X5R ceramic

capacitor (0603)

Murata GRM188R60J475K

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

op amp (6 SC70)

Maxim MAX9613AXT+

(Top Mark: +ADK)

Not installed, ceramic capacitors

(0805)

C3, C4, C8, C9

GND

INM, INP, OUTA

JU1

Black multipurpose test points

White multipurpose test points

2-pin header

—

Shunts

PCB: MAX9613 EVALUATION

KIT+

Component Supplier

SUPPLIER

Murata Electronics North America, Inc.

PHONE

WEBSITE

770-436-1300

www.murata-northamerica.com

Note: Indicate that you are using the MAX9613 when contacting this component supplier.

_______________________________________________________________ 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.

MAX9613 Evaluation Kit

7) Apply 400mV from the precision voltage source.

OUTA should read approximately +4.4V.

Quick Start

Required Equipment

•ꢀ MAX9613ꢀEVꢀkit

Detailed Description of Hardware

•ꢀ +5V,ꢀ10mAꢀDCꢀpowerꢀsupplyꢀ(PS1)

•ꢀ Precisionꢀvoltageꢀsource

The MAX9613 EV kit provides a proven layout for the

MAX9613 low-power, MOS-input op amp. The device

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

sensor signals. A Sallen-Key 2nd-order active filter, as

described in the Sallen-Key Configuration section, is

easily accomplished by changing and removing some

components. Various test points are included for easy

evaluation.

•ꢀ Digitalꢀmultimeterꢀ(DMM)

Procedure

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

below to verify board operation:

1) Verify that jumpers JU1 and JU2 are in their default

positions, as shown in Table 1.

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 shown in

the next few sections.

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

VDD test point and the negative terminal to the GND

test point closest to VDD.

3) Connect the positive terminal of the precision voltage

source to the INP test point. Connect the negative

terminal of the precision voltage source to GND (GND

or INM test points).

Noninverting Configuration

The EV kit comes preconfigured as a noninverting ampli-

fier with a gain of +11. The gain is set by the ratio of R5

and R1 (Figure 1). For a voltage applied to the INP test

point, the output voltage for the noninverting configura-

tion is given by the equation below:

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

test point. With the 10kI feedback resistor (R5) and

1kIseries resistor (R1), the gain is +11 (noninverting

configuration).







= 1+

INP



OUT

5) Turn on the +5V power supply.



1 

6) Apply 100mV from the precision voltage source.

Observe the output at OUTA on the DMM, which

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 R5 = R , the common-mode rejection

Table 1. EV Kit Jumper Descriptions

(JU1, JU2)

1kI

SHUNT

POSITION

INP

JUMPER

DESCRIPTION

OUTA

Connects the INM test point to

GND.

1-2*

JU1

Isolates the INM test point from

GND.

Open

1-2*

2-3

INM

Connects SHDN to VDD

(normal operation).

1kI

10kI

JU2

Connects SHDN to GND

(shutdown).

JU1

*Default position.

Figure 1. Default Noninverting Configuration with Gain +11

______________________________________________________________________________________

MAX9613 Evaluation Kit

Lowpass Sallen-Key Filter

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

the R2 and R8 pads with resistors, and populate the C3

and C4 pads with capacitors. The corner frequency and

Q are then given by (Figure 3):

ratio (CMRR) of the differential amplifier is determined

by the matching of the resistor ratios R5/R1 and R /R2

(Figure 2).

= GAIN V

− V

(

)

OUT

INP

INM

where:

2π R2× C3×R8× C4

GAIN =

R2× C3×R8× C4

C3 R2 + R8

Q =

(

)

10kI

1kI

INP

Highpass Sallen-Key Filter

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

the C3 and C4 pads with resistors, and populate the R2

and R8 pads with capacitors. The corner frequency and

Q are then given by (Figure 4):

OUTA

INM

2π C ×R × C ×R

1kI

10kI

×R × C ×R

Q =

+ C

(

)

Figure 2. Differential Configuration with Gain +10

C4 R2

Sallen-Key Configuration

The Sallen-Key active filter topology is ideal for sensor

signal conditioning with a 2nd-order filter. These filters

benefit from a rail-to-rail input structure with no crossover

distortion, such as that available on the device.

Capacitive Loads

Some applications require driving large capacitive loads.

To improve the stability of the amplifier in such cases,

either replace R6 with a suitable resistor value to improve

amplifier phase margin in the presence of capacitive

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

4.7nF

1nF

INP

19.6kI

2.74kI

OUTA

Figure 3. Lowpass 2nd-Order Filter Sallen-Key Configuration

for 10kHz

Figure 4. Generic 2nd-Order Highpass Sallen-Key Filter

_______________________________________________________________________________________

MAX9613 Evaluation Kit

Figure 5. MAX9613 EV Kit Schematic

______________________________________________________________________________________

MAX9613 Evaluation Kit

1.0’’

Figure 7. MAX9613 EV Kit PCB Layout—Component Side

Figure 6. MAX9613 EV Kit Component Placement Guide—

Component Side

1.0’’

Figure 8. MAX9613 EV Kit PCB Layout—Solder Side>

_______________________________________________________________________________________

MAX9613 Evaluation Kit

Revision History

REVISION REVISION

PAGES

CHANGED

DESCRIPTION

NUMBER

DATE

3/10

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.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

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